“150”, Aptitude Test Questions and Answers for Agricultural Engineer II – MDA, LGA & NIRC.
ABSTRACT
This preparation package contains 150
premium multiple-choice aptitude test questions and answers for candidates
preparing for the Mhandisi Kilimo Daraja la II (Agricultural Engineer II) –
MDA, LGA & NIRC Public Service online aptitude test in Tanzania. The
questions cover agricultural machinery and implement, irrigation engineering
and management, farm structures, mechanization, working animals, equipment
quality control, farmer training, engineering calculations, data collection,
technical decision-making, safety, and public-service responsibilities. The
questions are designed to reflect the challenging and closely related answer
choices commonly encountered in competitive aptitude examinations, with
practical scenarios relevant to Tanzania. Each question includes four balanced
options, the correct answer, and a detailed rationale to strengthen both
technical understanding and examination readiness.
Prepared by: Agricultural
Engineer II
Based in Dar-es-salaam.
0628729934.
Date: August 15, 2026
Dear applicants,
This collection of questions and answers
has been carefully prepared to help all of you to understand the key areas
tested during the interview. The goal is to provide a useful, and practical
study guide so you can all perform confidently and fairly in the selection
process. I wish you the best of luck, and may this resource support you in
achieving success!
Warm regards,
Physiotherapist II
For Personal Use by Applicants Preparing
for MDA and LGA Agricultural Engineer II interview at Public Service
Recruitment Service.
ALL
QUESTIONS ARE COMPILED TOGETHER.
1. An irrigation scheme has been operating for several years, and
farmers begin reporting a gradual decline in crop performance despite no major
reduction in the quantity of water supplied. Soil tests indicate increasing
electrical conductivity in the root zone. Which intervention should the
Agricultural Engineer consider most directly?
A. Increase irrigation frequency without
assessing drainage conditions B. Reduce canal capacity to limit the amount of
water entering the fields C. Improve drainage and apply appropriate leaching
where water quality permits D. Increase fertiliser application to compensate
for reduced crop performance
Answer: C
Rationale: Increasing soil salinity can reduce the
ability of crops to extract water and can progressively reduce productivity
even where irrigation supply appears adequate. The appropriate response depends
on the severity and cause of salinity, but improving drainage and applying
controlled leaching where suitable-quality water is available are established
approaches for removing accumulated salts from the root zone. Simply increasing
irrigation without adequate drainage can raise the water table and worsen the problem,
while additional fertiliser does not correct the underlying salinity.
2. A farmer is using a mouldboard plough behind a tractor, but the
tractor frequently loses traction and consumes unusually large amounts of fuel.
Field inspection shows that the plough is operating deeper than the recommended
depth for the soil and crop conditions. Which adjustment would most directly
address the problem?
A. Increase the tractor's forward speed
significantly B. Increase the number of plough bodies on the implement C.
Increase the tyre pressure to improve engine performance D. Reduce the working
depth to an appropriate operating level
Answer: D
Rationale: Excessive tillage depth substantially
increases draft requirement, which can cause wheel slip, increase fuel
consumption and place unnecessary loads on the tractor and implement. Reducing
the working depth to a level appropriate for the soil, crop and agronomic
objective reduces draft demand while maintaining effective tillage. Increasing
the number of plough bodies would increase the load, while changing tyre
pressure alone would not correct the fundamental problem of excessive implement
draft.
3. During preparation of an irrigation layout, an engineer
identifies substantial variation in ground slope across the proposed command
area. The soils also differ considerably in infiltration characteristics. Which
combination of factors should receive greatest attention when selecting the
irrigation method?
A. Field slope, soil infiltration and
required water-control characteristics B. Crop market value, farm ownership
and distance to the nearest village C. Canal length, number of tractors and
availability of farm labour D. Farm size, storage capacity and distance from
the district headquarters
Answer: A
Rationale: Selection of an irrigation method should
be based primarily on physical and hydraulic characteristics that determine how
water can be delivered and applied effectively. Field slope influences water
movement and erosion risk, while infiltration characteristics affect
application rates and irrigation duration. The required level of water control
is also important when choosing between irrigation methods. Other factors may
influence broader project planning but are not the primary engineering
determinants of the irrigation method.
4. An irrigation pump is delivering considerably less water than
its normal operating discharge even though the pump motor appears to be running
normally. Which field observation would provide the strongest initial
indication of a suction-side problem?
A. The delivery channel has recently been
cleaned thoroughly B. The suction pipe admits air or has an inadequate water
seal C. The irrigation plots have been divided into smaller units D. The
farmers have changed their irrigation rotation schedule
Answer: B
Rationale: Air entering the suction line can
interrupt proper pump priming and significantly reduce pumping performance. A
leaking suction connection, defective foot valve, inadequate submergence or
other suction-side problem can prevent the pump from maintaining the conditions
necessary for normal operation. The other observations may affect scheme
management but do not provide a direct explanation for a sudden reduction in
pump discharge.
5. A farmer group requests a training programme on tractor
operation. The engineer discovers that most participants have limited
experience operating tractors, while a few participants are already experienced
operators. What is the most appropriate training approach?
A. Deliver identical advanced material to
every participant B. Exclude experienced operators from all practical sessions C.
Assess participants' competence and structure training accordingly D. Provide
only theoretical instruction to avoid operating risks
Answer: C
Rationale: Effective technical training should be
based on the learners' existing knowledge and practical competence. A
preliminary assessment allows the trainer to identify knowledge gaps and
organise appropriate theoretical and practical activities. Experienced operators
can receive more advanced instruction while less experienced participants
receive foundational training. Providing identical advanced material risks
leaving inexperienced farmers behind, while purely theoretical training would
fail to develop the practical skills required for safe tractor operation.
6. A surface irrigation scheme experiences increasing waterlogging
in parts of the command area after several seasons of operation. The water
supply has not increased significantly, but farmers report that drainage
channels have become partially obstructed. Which intervention should receive
priority?
A. Increasing irrigation duration
throughout the command area B. Expanding
the command area to distribute available water widely C. Increasing the number of irrigation
outlets in affected plots D. Restoring drainage capacity and controlling
excessive application
Answer: D
Rationale: Waterlogging occurs when water supplied
to or entering the soil exceeds the rate at which it can drain away. Blocked
drainage channels can prevent excess water from leaving the command area, while
excessive irrigation can further aggravate the condition. Restoring drainage
capacity and ensuring that irrigation application is properly controlled
directly addresses the underlying problem. Increasing irrigation duration or
expanding the command area would not correct inadequate drainage and could
worsen waterlogging.
7. A tractor operator reports excessive wheel slip while pulling
an implement. The field is wet, the implement is operating at substantial
depth, and the tractor is carrying little ballast on its drive axle. Which
factor combination most directly explains the poor traction?
A. Low soil strength, high implement
draft and inadequate weight distribution B. High engine temperature, low fuel
quality and excessive steering effort C. Low radiator pressure, high tyre
temperature and excessive PTO speed D. High hydraulic pressure, low
transmission oil and inadequate engine cooling
Answer: A
Rationale: Traction depends on the interaction
between the tractor tyres and soil and the draft imposed by the implement. Wet
soil can provide reduced usable traction, while greater implement depth
increases draft demand. Insufficient weight on the driving axle can further
reduce the available traction force. These factors together provide a
technically consistent explanation for excessive wheel slip and should be
investigated before unrelated tractor systems are considered.
8. An irrigation engineer is collecting data to determine whether
a scheme is delivering water efficiently. Which set of information would be
most useful for evaluating the scheme's irrigation performance?
A. Number of farmers, village population
and market distance B. Canal length, crop colour and number of farm buildings C.
Water delivered, water applied and crop-use conditions D. Tractor ownership,
seed varieties and household income levels
Answer: C
Rationale: Evaluation of irrigation performance
requires information about the quantities of water entering, being conveyed
through and being applied within the irrigation system, together with relevant
crop and field conditions. Such data allow the engineer to identify conveyance,
distribution or application inefficiencies. Farmer population and socioeconomic
information may be useful for broader planning, but they do not directly
measure the hydraulic performance of the irrigation system.
9. A pressurised irrigation pipeline experiences a sudden pressure
surge whenever a pump is stopped abruptly. Repeated occurrences have damaged
pipe joints and fittings. Which engineering measure would most directly address
the underlying hydraulic problem?
A. Increase the operating pressure of the
pump B. Reduce the pipe diameter to increase flow resistance C. Increase the
number of downstream irrigation outlets D. Introduce appropriate surge-control
measures and controlled pump shutdown
Answer: D
Rationale: A sudden change in flow velocity caused
by rapid pump shutdown can generate a pressure surge commonly associated with
water hammer. Repeated pressure surges can damage pipes, joints, valves and
other components. Appropriate measures may include controlled pump stopping,
surge vessels, air chambers, relief devices or other protection selected
according to the system analysis. Increasing pressure or reducing pipe diameter
would not provide an appropriate solution and could worsen operating
conditions.
10. A sprinkler irrigation system performs satisfactorily during
calm conditions but develops poor application uniformity during periods of
strong wind. Which adjustment would most directly reduce this problem?
A. Increase sprinkler spacing regardless
of wind conditions B. Increase operating pressure substantially above the
design range C. Operate the system during periods of lower wind or adjust the
system appropriately for wind conditions D. Increase irrigation duration while
maintaining the same wind-exposed operation
Answer: C
Rationale: Wind can distort sprinkler water
distribution by carrying droplets away from their intended application pattern,
reducing uniformity. Scheduling irrigation during periods of lower wind is
often an effective management response where feasible. System design and
operating pressure should also remain within appropriate specifications. Simply
increasing pressure or irrigation duration does not necessarily restore
uniformity and may increase losses without correcting wind-induced distribution
problems.
11. A farmer intends to use a tractor-mounted planter, but the seed
spacing in the field is consistently wider than the required agronomic spacing.
Which action should the Agricultural Engineer recommend before changing tractor
speed?
A. Check and calibrate the planter
metering mechanism B. Increase tyre pressure on the tractor's rear wheels C.
Increase the depth of the planter furrow substantially D. Reduce the width of
the tractor's rear axle
Answer: A
Rationale: Seed spacing is primarily controlled by
the planter's metering and seed-delivery system, together with factors such as
drive-wheel relationship and operating speed. Calibration should therefore be
performed to determine whether the metering mechanism is correctly adjusted for
the desired seed rate and spacing. Changing tyre pressure, axle width or furrow
depth does not directly correct an improperly calibrated seed-metering
mechanism.
12. During construction of an irrigation canal, a contractor
proposes reducing the canal cross-sectional dimensions to save construction
costs while maintaining the same design discharge. Which engineering issue
should be assessed first?
A. Whether the smaller section will
reduce the need for routine canal inspection B. Whether the revised section
can convey the design discharge within allowable velocity and freeboard limits
C. Whether reduced dimensions will automatically improve irrigation efficiency D.
Whether the smaller section will eliminate the need for downstream control
structures
Answer: B
Rationale: Canal dimensions cannot be reduced
solely on the basis of construction savings because the cross-sectional area
directly affects hydraulic behaviour. For the same discharge, a smaller
effective flow area may result in higher velocity, while changes in depth can
affect freeboard, erosion risk and bank stability. The revised section must
therefore be checked against the design discharge, permissible velocity,
freeboard and other hydraulic requirements before it can be accepted.
13. Soil tests from an irrigated field show increasing salt
accumulation in the root zone, while the drainage system is functioning poorly.
Which response would be most appropriate as part of a longer-term
rehabilitation strategy?
A. Increase fertiliser application to
offset the effects of salt accumulation B. Reduce drainage capacity so that
irrigation water remains longer in the soil C. Improve drainage and assess the
need for controlled leaching with suitable-quality water D. Increase
irrigation intensity without evaluating groundwater conditions
Answer: C
Rationale: Salt accumulation under irrigation is
often associated with insufficient removal of salts from the root zone and
inadequate drainage. Improving drainage helps prevent the water table from
rising excessively, while controlled leaching can move accumulated salts below
the root zone when suitable-quality water is available. Increasing irrigation
without adequate drainage can aggravate salinity and waterlogging. Fertiliser
application does not address the underlying salt accumulation.
14. An agricultural engineer is preparing a practical demonstration
on the safe use of a tractor-driven implement for farmers with different
literacy levels. Which method is most appropriate?
A. Provide a long written manual and
minimise practical demonstration B. Demonstrate the operation practically and
reinforce it with simple instructions C. Give the farmers technical
specifications without operating the machine D. Ask experienced farmers to
train others without engineering supervision
Answer: B
Rationale: Practical demonstration is particularly
effective when the training objective involves operating machinery safely and
correctly. The engineer should demonstrate the procedure, explain critical
points using clear language and allow participants to practise under
supervision. Simple visual or verbal instructions can reinforce the
demonstration. Written technical specifications alone are unlikely to ensure
that farmers understand the sequence of safe operations.
15. A farmer stores maize in a poorly ventilated grain store
immediately after harvesting. The grain has relatively high moisture content.
Which combination of conditions presents the greatest risk of deterioration?
A. High moisture, inadequate aeration and
elevated storage temperature B. Low moisture, adequate ventilation and
moderate storage temperature C. Low moisture, clean storage and controlled air
movement D. Dry grain, sound structure and regular inspection practices
Answer: A
Rationale: High grain moisture combined with poor
ventilation and elevated temperature creates favourable conditions for
biological deterioration, including mould growth, insect activity and quality
loss. A good grain-storage structure should therefore support proper drying
before storage, protect grain from moisture ingress and provide appropriate
ventilation. Simply constructing a strong structure is insufficient if grain
enters storage with excessive moisture.
16. A tractor is fitted with a power take-off (PTO) implement that
requires a specified rotational speed for proper operation. The operator
selects an incorrect PTO setting and the implement runs substantially below its
recommended speed. What is the most likely consequence?
A. The implement will automatically
maintain its designed speed through the hydraulic system B. The implement's
working width will automatically decrease to maintain the required field
capacity C. The tractor will automatically increase PTO speed whenever
implement resistance rises D. The implement may perform below its intended
capacity or produce poor-quality work
Answer: D
Rationale: PTO-driven implements are designed to
operate at specified rotational speeds. Operating below the required PTO speed
can reduce the performance of equipment such as pumps, mowers, threshers and
other PTO-powered machinery. The operator should therefore select the
appropriate PTO setting and engine operating condition according to the tractor
and implement manufacturer's requirements. The hydraulic system does not
automatically compensate for an incorrectly selected PTO speed.
17. During an irrigation survey, the engineer needs to determine
whether the proposed canal alignment can convey water by gravity to the
intended command area. Which information is most critical?
A. Relative ground elevations along the
proposed alignment B. Number of households owning agricultural machinery C.
Average age of farmers using the proposed command area D. Distance from the
nearest agricultural produce market
Answer: A
Rationale: Gravity irrigation depends on the
available elevation difference and hydraulic gradient between the water source
and the command area. Surveying ground elevations along the proposed canal
alignment helps determine whether sufficient head exists to convey water and
whether structures such as drops, checks or other control works may be
required. Socioeconomic information can support project planning but cannot
establish whether the proposed hydraulic alignment is feasible.
18. A farmer operates a disc harrow at a speed substantially higher
than that recommended for the implement. The resulting soil surface is uneven
and the machine experiences excessive vibration. Which engineering response is
most appropriate?
A. Increase speed further to improve soil
penetration B. Reduce speed and verify implement adjustment and operating
conditions C. Add unrelated weights to the tractor's front axle D. Increase
the number of disc blades without checking the machine
Answer: B
Rationale: Excessive operating speed can adversely
affect implement stability, soil engagement and the quality of tillage,
particularly where the machine is not designed for that speed. Reducing speed
to the recommended operating range and checking disc angle, depth, hitch
adjustment and field conditions is the appropriate response. Adding weight or
increasing the number of discs without diagnosis may increase draft and
vibration rather than solve the underlying problem.
19. An irrigation scheme has been operating for several years, and
farmers report that water reaches some plots much later than indicated by the
original irrigation schedule. Which investigation would best help determine
whether the problem is related to changes in the conveyance system?
A. Compare current canal flow and travel
conditions with the original design assumptions B. Replace all field crops
before inspecting the canal network C. Increase farmer numbers to improve the
use of available water D. Extend every farmer's irrigation period without
measuring canal performance
Answer: A
Rationale: Changes in canal condition, sediment
accumulation, vegetation growth, structural damage, leakage or altered
hydraulic conditions can affect flow rates and travel times. Comparing current
hydraulic performance with design assumptions and field observations helps
identify whether the conveyance system has deteriorated or changed. Extending
irrigation periods without understanding the cause may increase water demand
and fail to correct the underlying distribution problem.
20. A government institution is considering purchasing agricultural
machinery that has a high initial cost but is expected to operate for many
years. Which approach would provide the soundest basis for comparing it with a
lower-priced alternative?
A. Compare only the initial purchase
prices of the two machines B. Compare expected life-cycle costs, utilisation,
maintenance and operational benefits C. Select the machine with the greater
engine power regardless of expected use D. Select the lower-priced machine
regardless of its operating and maintenance requirements
Answer: B
Rationale: Machinery procurement should consider
the total economic implications over the expected service life rather than the
purchase price alone. Fuel, maintenance, repairs, utilisation, expected service
life, downtime and productivity benefits can substantially affect the actual
cost of ownership. A machine with a higher purchase price may be economically
preferable if it delivers greater benefits and lower operating costs over its
useful life. Life-cycle assessment therefore provides a stronger basis for comparison.
21. A centrifugal irrigation pump is operating at a speed within
its design range. If the pump speed is increased substantially while the system
and pump type remain otherwise comparable, which effect should the engineer
expect in general?
A. Power demand will always decrease
because the pump completes the operation faster B. Discharge will remain
unchanged while only the pump's physical weight increases C. Pump head will
necessarily decrease to zero as rotational speed increases D. Discharge, head
and power demand may all increase according to the pump affinity relationships
Answer: D
Rationale: For geometrically similar operating
conditions, pump affinity relationships indicate that discharge varies
approximately with rotational speed, head varies approximately with the square
of speed, and power varies approximately with the cube of speed. Consequently,
increasing pump speed can substantially increase power demand as well as
discharge and head. Actual system behaviour depends on the pump curve and
system curve, so speed changes must remain within the manufacturer's operating
limits.
22. During testing of a tractor-mounted implement, the engineer
records the effective field capacity as substantially lower than the
theoretical field capacity. Which factor would most directly explain this
difference?
A. The manufacturer's country of origin B.
The colour of the implement's frame C. Time lost during turning, adjustment,
refuelling and other non-working activities D. The number of agricultural
extension officers assigned to the district
Answer: C
Rationale: Theoretical field capacity assumes
continuous operation at the specified working width and speed without time
losses. Effective field capacity accounts for real operating conditions,
including turning at field ends, adjustments, unloading, refuelling, minor
interruptions and other delays. Therefore, effective field capacity is normally
lower than theoretical field capacity. The difference provides useful
information for evaluating actual machinery productivity under field
conditions.
23. An engineer is reviewing an irrigation scheme where farmers
frequently over-irrigate because they believe applying more water always
increases crop yield. Which intervention would best address the technical
misunderstanding?
A. Increase the duration of every
irrigation turn B. Remove water-control structures from the scheme C. Encourage
farmers to irrigate whenever the canal contains water D. Demonstrate crop water
requirements and the effects of excess application
Answer: D
Rationale: Farmers need to understand the
relationship between crop water requirements, soil moisture, irrigation timing
and crop performance. A practical demonstration showing appropriate irrigation
amounts and the consequences of excessive application can correct the
misconception that more water necessarily produces higher yields.
Over-irrigation can cause nutrient losses, waterlogging, unnecessary pumping or
conveyance demand and other problems without providing proportional crop
benefits.
24. A farmer intends to use a pair of draught animals for a
mouldboard-type animal-drawn plough. Before recommending the implement, which
additional factor is most important to assess?
A. The colour and material of the
animals' harness B. The animals' working capacity relative to the expected
draft and duration of work C. The distance from the farm to the nearest
machinery dealer D. The number of tractor mechanics available in the district
Answer: B
Rationale: Draught-animal equipment must be matched
to the sustained working capacity of the animals and the draft imposed by the
implement under actual field conditions. Soil type, moisture, working depth,
field slope and duration of work can all influence the required draft and
animal workload. A technically suitable implement can still be inappropriate if
it causes excessive fatigue or exceeds the animals' safe working capacity.
Proper assessment therefore considers the complete animal–implement–field
combination.
25. During inspection of an irrigation structure, the engineer
discovers that several construction activities were carried out using approved
materials but the contractor did not maintain adequate records of material
tests, measurements and inspection results. What should the engineer establish
before recommending formal project close-out?
A. Whether the structure appears visually
acceptable from the surrounding road B. Whether farmers are satisfied with the
contractor's work C. Whether the contractor completed construction within the
planned calendar period D. Whether the required quality-control and completion
documentation can be verified and properly compiled
Answer: D
Rationale: Construction quality cannot be
established solely from visual appearance or the fact that the structure is
functioning. Material-test results, measurements, inspection records, as-built
information and other quality-control documentation provide evidence that the
completed works complied with the approved requirements. Where records are
missing, the engineer should determine what verification is possible and ensure
that the required completion documentation is properly compiled before
recommending formal close-out. This provides a defensible technical record for
future operation, maintenance and accountability.
26. An irrigation scheme is supplied by a river whose flow varies
considerably between the rainy and dry seasons. The command area is expected to
require a relatively stable water supply throughout the production season.
Which engineering consideration is most important when planning the scheme?
A. Increasing the number of farmers
served during the rainy season B. Matching storage, abstraction and demand to
seasonal water availability C. Selecting crops solely according to their
market prices D. Designing field channels without considering source-flow
variation
Answer: B
Rationale: A variable river flow must be considered
against the irrigation demand throughout the production season. The engineer
should assess seasonal water availability and determine whether storage,
controlled abstraction or other measures are required to bridge periods when
river flow is insufficient. Designing the system around wet-season availability
alone could result in serious shortages during the dry season. Crop selection
and field-channel design are important, but neither can substitute for properly
matching the water source to the expected demand.
27. A tractor is operating on a field with highly variable soil
moisture. The operator maintains the same implement depth throughout the field,
resulting in excessive draft in wetter sections and inadequate tillage in
harder sections. What is the most appropriate engineering recommendation?
A. Maintain the same depth and increase
tractor speed B. Increase implement width throughout the entire field C.
Adjust operating depth according to field conditions where appropriate D. Add
ballast to the tractor without changing implement settings
Answer: C
Rationale: Soil strength and draft requirements can
vary substantially across a field depending on moisture and soil type.
Maintaining a fixed depth under all conditions may cause excessive loading in
some areas and inadequate tillage in others. Where agronomically appropriate,
adjusting operating depth or implement settings to suit field conditions can
improve performance and reduce unnecessary energy consumption. Simply
increasing speed or ballast does not address the variation in draft demand.
28. During construction of a small irrigation scheme, the engineer
notices that the canal embankment is being compacted in very thick layers.
Which concern should be raised immediately?
A. Thick layers may prevent uniform and
adequate compaction throughout the embankment B. Thick layers always increase
the canal's hydraulic carrying capacity C. Thick layers eliminate the need to
control soil moisture during compaction D. Thick layers automatically improve
resistance to seepage and erosion
Answer: A
Rationale: Proper embankment compaction requires
suitable layer thickness, moisture condition and compaction effort so that the
entire layer achieves the required density. If soil is placed in excessively
thick layers, the compaction equipment may not transmit sufficient energy
throughout the full depth, leaving weak or poorly compacted zones. Such areas
can later contribute to settlement, cracking, seepage or structural
instability. The engineer should therefore ensure that construction follows the
approved compaction procedure.
29. An agricultural engineer is evaluating a tractor training
programme and finds that participants can explain tractor controls correctly
but several cannot safely perform basic operations in the field. What does this
finding most strongly indicate?
A. The theoretical component was
unnecessary for the participants B. The assessment should measure practical
competence as well as knowledge C. The participants should receive only
written manuals for further practice D. The training programme should be
evaluated using attendance records alone
Answer: B
Rationale: Knowing the function of a control does
not necessarily demonstrate the ability to operate machinery safely. A
competent training programme should assess both knowledge and practical
performance, particularly where machinery operation involves safety risks.
Practical assessment allows the trainer to determine whether participants can
correctly apply what they have learned under realistic conditions. Attendance
records or written explanations alone cannot adequately establish operational
competence.
30. A farmer plans to install a drip irrigation system but intends
to use untreated surface water containing substantial suspended particles.
Which component is particularly important to prevent blockage of emitters?
A. Larger field boundaries B. Deeper
crop planting holes C. Additional tractor ballast D. An appropriate
filtration system
Answer: D
Rationale: Drip emitters have relatively small flow
passages and are particularly susceptible to clogging when irrigation water
contains suspended particles or other contaminants. An appropriately selected
filtration system is therefore essential, together with suitable water-quality
management and regular maintenance. Increasing field size, altering planting
depth or adding tractor ballast has no direct role in protecting the emitters
from suspended solids.
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