Irrigation Agronomy and Water Management MCQs 2026

Net irrigation requirement excludes:

1. A application and conveyance losses ✓
2. B crop water demand ✓
3. C effective rainfall adjustment ✓
4. D root-zone storage use ✓

The IW/CPE approach schedules irrigation based on a ratio of irrigation water depth to:

1. A cumulative pan evaporation ✓
2. B soil pH ✓
3. C seed rate ✓
4. D canal command area ✓

Sandy soils usually require irrigation at:

1. A shorter intervals with smaller depths ✓
2. B longer intervals with larger depths only ✓
3. C no interval because they store all water ✓
4. D the same interval as clay in all climates ✓

Crop Water Stress Index is used to indicate:

1. A seed dormancy ✓
2. B canal seepage only ✓
3. C plant water deficit or stress ✓
4. D fertilizer solubility ✓

Mulching can reduce irrigation requirement by:

1. A blocking infiltration completely ✓
2. B reducing soil evaporation and moderating temperature ✓
3. C increasing evaporation from soil ✓
4. D raising salinity of irrigation water ✓

Pressurized irrigation systems require:

1. A adequate pressure and energy for distribution ✓
2. B no energy or pressure at all ✓
3. C only gravity flow in open canals ✓
4. D continuous waterlogging ✓

Water productivity is best defined as:

1. A crop output per unit of water depleted or used ✓
2. B canal width per hectare ✓
3. C fertilizer dose per irrigation ✓
4. D plant height per day only ✓

Infiltration rate is the rate at which water:

1. A moves through canals only ✓
2. B is transpired by plants ✓
3. C enters the soil surface ✓
4. D evaporates from leaves ✓

Soil texture affects irrigation scheduling because it influences:

1. A market price only ✓
2. B water-holding capacity and infiltration rate ✓
3. C leaf color only ✓
4. D seed purity only ✓

Alternate wetting and drying is a water-saving practice mainly used in:

1. A rice production ✓
2. B cotton under furrows ✓
3. C rainfed chickpea only ✓
4. D orchard pruning ✓

Laser land leveling is valued because it:

1. A improves field grade and water distribution ✓
2. B increases uneven ponding ✓
3. C prevents all evapotranspiration ✓
4. D removes the need for irrigation scheduling ✓

Tailwater runoff is the water that:

1. A moves upward by capillarity ✓
2. B is stored in seed bags ✓
3. C leaves the downstream end of an irrigated field ✓
4. D enters soil pores at field capacity ✓

Basin irrigation is especially common for:

1. A sprinkler laterals only ✓
2. B orchards and level small plots ✓
3. C steep uncultivated hill slopes ✓
4. D dry seed storage rooms ✓

Gross irrigation requirement is greater than net requirement because it includes:

1. A losses and efficiencies in application or conveyance ✓
2. B only seed moisture ✓
3. C only crop coefficient ✓
4. D only wilting point ✓

Agricultural drainage is provided mainly to:

1. A keep the water table at the soil surface ✓
2. B stop leaching of salts completely ✓
3. C remove excess water from the root zone ✓
4. D increase waterlogging ✓

Rotational irrigation in a command area means:

1. A water is supplied without schedule ✓
2. B water turns are allocated according to a schedule ✓
3. C every farmer irrigates at the same time ✓
4. D only groundwater is used ✓

Night irrigation can save water in hot areas mainly by reducing:

1. A evaporative loss during application ✓
2. B soil fertility ✓
3. C root growth ✓
4. D field capacity ✓

Proper land leveling improves irrigation mainly by:

1. A improving water distribution uniformity ✓
2. B increasing high spots and depressions ✓
3. C reducing germination uniformly ✓
4. D increasing runoff losses necessarily ✓

Puddling in rice fields mainly helps to:

1. A make soil highly permeable ✓
2. B remove all standing water ✓
3. C reduce percolation losses and control weeds ✓
4. D increase deep percolation rapidly ✓

The crop coefficient Kc relates crop evapotranspiration to:

1. A fertilizer dose only ✓
2. B reference evapotranspiration ✓
3. C canal seepage loss only ✓
4. D soil bulk density only ✓

Pan evaporation data are commonly used to estimate:

1. A crop evapotranspiration for irrigation scheduling ✓
2. B soil texture class directly ✓
3. C seed viability ✓
4. D sodium percentage in fertilizer ✓

Effective rainfall is the portion of rainfall that:

1. A contributes to meeting crop water requirement ✓
2. B falls outside the command area ✓
3. C is lost entirely as runoff ✓
4. D occurs after harvest only ✓

Micro-irrigation includes:

1. A only check basin irrigation ✓
2. B only border irrigation ✓
3. C drip and micro-sprinkler systems ✓
4. D only wild flooding ✓

Surge irrigation is a furrow technique in which water is:

1. A applied only through sprinklers ✓
2. B applied intermittently in repeated on-off cycles ✓
3. C kept ponded throughout the season ✓
4. D never allowed to enter furrows ✓

Conjunctive use refers to the planned use of:

1. A surface water and groundwater together ✓
2. B fertilizer and pesticide only ✓
3. C seed and machinery together ✓
4. D rainfall and sunlight only ✓

The sodium hazard of irrigation water is indicated by:

1. A sodium adsorption ratio ✓
2. B crop coefficient only ✓
3. C permanent wilting point ✓
4. D pan size ✓

The salinity hazard of irrigation water is commonly assessed by:

1. A soil bulk density ✓
2. B leaf area index ✓
3. C electrical conductivity ✓
4. D seed germination percentage ✓

Sprinkler irrigation is less suitable under high wind because wind:

1. A eliminates evaporation ✓
2. B causes drift and poor distribution uniformity ✓
3. C raises field capacity ✓
4. D increases droplet infiltration uniformly ✓

A tensiometer is used to measure:

1. A soil water tension ✓
2. B canal discharge only ✓
3. C fertilizer purity ✓
4. D crop leaf area index only ✓

Capillary rise is the:

1. A upward movement of water from a shallow water table ✓
2. B loss of water through canal breaches ✓
3. C downward movement only below roots ✓
4. D measurement of sprinkler pressure ✓

Deficit irrigation means:

1. A irrigating only after harvest ✓
2. B flooding the field continuously ✓
3. C applying less than full crop water requirement in a planned manner ✓
4. D applying unlimited water at all stages ✓

Rice generally has a high water requirement partly because of:

1. A no transpiration from the crop ✓
2. B puddling and maintenance of standing water in many systems ✓
3. C zero percolation losses in all soils ✓
4. D absence of evaporation from fields ✓

For wheat, the crown root initiation stage is important because irrigation then:

1. A promotes root establishment and tillering ✓
2. B stops tillering permanently ✓
3. C prevents grain filling entirely ✓
4. D eliminates fertilizer need ✓

Critical stages of irrigation are stages when crop yield is:

1. A most sensitive to water stress ✓
2. B unaffected by moisture supply ✓
3. C determined only by seed size ✓
4. D independent of transpiration ✓

Border irrigation is generally best suited to:

1. A widely spaced orchard basins only ✓
2. B rocky slopes without leveling ✓
3. C close-growing crops on properly leveled land ✓
4. D very irregular steep fields ✓

Irrigation efficiency is the ratio of:

1. A canal length to command area ✓
2. B water beneficially used to water applied ✓
3. C rainfall to fertilizer applied ✓
4. D seed yield to plant population ✓

Canal lining improves irrigation water management mainly by reducing:

1. A seepage and conveyance losses ✓
2. B crop transpiration ✓
3. C seed dormancy ✓
4. D field capacity ✓

Leaching requirement is the extra irrigation water needed to:

1. A remove salts below the root zone ✓
2. B increase soil compaction ✓
3. C raise sodium adsorption ratio ✓
4. D stop all evapotranspiration ✓

Waterlogging harms crops mainly because it:

1. A always improves nitrogen fixation ✓
2. B eliminates soil salinity ✓
3. C reduces root-zone aeration ✓
4. D increases oxygen supply to roots ✓

Sprinkler irrigation applies water by:

1. A open field channels only ✓
2. B spraying water into the air to resemble rainfall ✓
3. C continuous deep ponding ✓
4. D subsurface drainage pipes only ✓

Crop water-use efficiency is commonly expressed as:

1. A crop yield per unit of water used ✓
2. B soil pH per hectare ✓
3. C canal length per command area ✓
4. D seed weight per plant only ✓

A sound irrigation schedule is commonly based on:

1. A allowable depletion of available soil moisture ✓
2. B calendar dates only without soil or crop data ✓
3. C seed color at sowing ✓
4. D canal name only ✓

Furrow irrigation is most suitable for:

1. A lawns under high wind ✓
2. B very steep ungraded land ✓
3. C row crops such as maize, cotton and vegetables ✓
4. D closely spaced broadcast rice only ✓

Available soil water is approximately the difference between:

1. A rainfall and evaporation only ✓
2. B field capacity and permanent wilting point ✓
3. C saturation and runoff ✓
4. D canal duty and base period ✓

Permanent wilting point is reached when plants:

1. A cannot regain turgor even in a humid atmosphere ✓
2. B grow at maximum rate ✓
3. C transpire at potential rate ✓
4. D receive their first irrigation ✓

Among common irrigation methods, the highest field water-use efficiency is generally obtained with:

1. A border flooding ✓
2. B uncontrolled basin irrigation ✓
3. C drip irrigation ✓
4. D wild flooding ✓

Delta of a crop refers to the:

1. A rate of infiltration per hour ✓
2. B total depth of water required by the crop ✓
3. C irrigation interval in days ✓
4. D amount of fertilizer dissolved in water ✓

In irrigation terminology, duty means the:

1. A area irrigated by a unit discharge during the base period ✓
2. B depth of water stored in soil pores ✓
3. C salt content of irrigation water ✓
4. D speed of water flowing in a furrow ✓

Consumptive use of water by a crop is essentially:

1. A evapotranspiration from crop and soil ✓
2. B water lost only by deep percolation ✓
3. C canal seepage before the field ✓
4. D rainfall outside the growing season ✓

Waterlogging occurs when

1. A the water table rises into the root zone ✓
2. B soil is permanently dry ✓
3. C EC is zero ✓
4. D OM is high only ✓

Delta of a crop refers to

1. A soil texture class ✓
2. B EC of groundwater only ✓
3. C total depth of water required by the crop ✓
4. D canal length ✓

The Indus Basin Irrigation System is one of the world's

1. A smallest farm ponds ✓
2. B only rainfed systems ✓
3. C exclusive drip-only national grid ✓
4. D largest contiguous irrigation networks ✓

Warabandi is a system of

1. A fertilizer rationing only ✓
2. B seed certification ✓
3. C rotational turns for canal water distribution among farmers ✓
4. D livestock vaccination ✓

A mogha is

1. A a type of fertilizer ✓
2. B a wheat variety ✓
3. C a tractor implement ✓
4. D an outlet delivering water from a canal to a watercourse ✓

Conveyance losses in earthen canals occur mainly by

1. A seepage and evaporation ✓
2. B photosynthesis ✓
3. C nitrogen fixation ✓
4. D wind pollination ✓

On-farm water application in Pakistan is still dominated by

1. A only drip nationwide ✓
2. B only center pivots everywhere ✓
3. C only subsurface irrigation ✓
4. D basin/flood irrigation ✓

Water-use efficiency can be improved by

1. A over-irrigation every day ✓
2. B blocking all drains ✓
3. C raising water tables deliberately ✓
4. D laser land leveling and better scheduling ✓

Drip irrigation is especially suitable for

1. A flooding rice paddies exclusively ✓
2. B leaching salts without any emitter design ✓
3. C orchards and high-value crops with precise water delivery ✓
4. D only forest firefighting ✓

Sprinkler irrigation applies water

1. A as spray over the canopy/soil surface ✓
2. B only underground via tiles ✓
3. C only as flood in borders ✓
4. D only as steam ✓

Field application efficiency is the ratio of

1. A rainfall to GDP ✓
2. B fertilizer to yield only ✓
3. C seepage to evaporation only ✓
4. D water stored in the root zone to water delivered to the field ✓

Duty of water in irrigation engineering relates to

1. A fertilizer bag weight ✓
2. B seed rate ✓
3. C area irrigated by a unit discharge ✓
4. D tractor HP ✓

A major cause of waterlogging in Indus irrigated areas is

1. A complete absence of canals ✓
2. B desert dunes only ✓
3. C canal seepage and over-irrigation without drainage ✓
4. D mountain glaciers covering fields ✓

Salinity in irrigated soils builds up when

1. A rainfall always flushes perfectly ✓
2. B plants consume all salts ✓
3. C fertilizers contain no nutrients ✓
4. D evaporation leaves salts behind and leaching/drainage are inadequate ✓

Secondary salinization is associated with

1. A only ocean spray on mountains ✓
2. B irrigation in arid climates with poor drainage ✓
3. C only organic farming ✓
4. D rainforest leaching ✓

SCARP projects in Pakistan aimed to

1. A ban all irrigation ✓
2. B control waterlogging and salinity through drainage and tube wells ✓
3. C increase water tables ✓
4. D remove all crops ✓

Horizontal drainage systems include

1. A tile/pipe drains and open drains ✓
2. B only cloud seeding ✓
3. C only fog nets ✓
4. D only mulching ✓

Vertical drainage in SCARP context often meant

1. A building taller bunds only ✓
2. B tube wells pumping to lower water tables ✓
3. C planting only rice ✓
4. D sealing moghas ✓

Leaching requirement is the

1. A minimum seed rate ✓
2. B extra water needed to flush salts below the root zone ✓
3. C N fertilizer dose ✓
4. D tractor fuel use ✓

Irrigation water with high EC is

1. A always perfectly safe ✓
2. B pure distilled water ✓
3. C saline and may reduce crop yields ✓
4. D free of all ions ✓

RSC (residual sodium carbonate) indicates

1. A only nitrate pollution ✓
2. B only BOD ✓
3. C alkalinity/sodicity hazard of irrigation water ✓
4. D only turbidity ✓

Conjunctive use means

1. A using only rainfall ✓
2. B banning tube wells ✓
3. C combined use of surface and groundwater ✓
4. D canal water only forever ✓

Over-pumping of fresh groundwater can cause

1. A rising aquifers always ✓
2. B improved soil structure automatically ✓
3. C end of salinity ✓
4. D declining water tables and intrusion of saline water ✓

Skimming wells are designed to

1. A extract only brine ✓
2. B irrigate with seawater directly ✓
3. C deepen salinity ✓
4. D pump relatively fresh water from thin lenses above saline groundwater ✓

Laser land leveling helps irrigation by

1. A increasing undulations ✓
2. B blocking furrows ✓
3. C raising bunds randomly ✓
4. D improving surface uniformity and reducing water use ✓

Furrow irrigation is often preferred over flat basin for

1. A row crops to improve aeration and reduce some disease ✓
2. B flooding entire orchards only ✓
3. C rice puddling exclusively ✓
4. D submerging wheat permanently ✓

Alternate furrow irrigation can

1. A always double water use ✓
2. B save water while maintaining acceptable yields in some crops ✓
3. C eliminate all ET ✓
4. D replace rainfall ✓

Critical growth stages for irrigation are times when

1. A crops need no water ✓
2. B water stress causes large yield losses ✓
3. C dormant seeds store dry ✓
4. D harvest is complete ✓

Rice cultivation typically requires

1. A desert dryland only ✓
2. B standing water or saturated soil for much of the season in flooded systems ✓
3. C zero water after transplanting ✓
4. D only sprinkler without puddling always ✓

AWD (alternate wetting and drying) in rice aims to

1. A reduce water use without major yield loss ✓
2. B keep continuous deep flooding always ✓
3. C eliminate irrigation ✓
4. D grow rice as a desert cactus ✓

Water productivity means

1. A crop output per unit of water consumed or applied ✓
2. B liters per tractor hour only ✓
3. C only canal length ✓
4. D fertilizer per acre only ✓

Seepage from unlined watercourses contributes to

1. A increased soil OM automatically ✓
2. B waterlogging in adjoining lands ✓
3. C lower water tables always ✓
4. D perfect drainage ✓

OFWM (On Farm Water Management) programs promote

1. A watercourse improvement, precision land leveling and HEIS ✓
2. B abandoning all canals ✓
3. C banning farmer organizations ✓
4. D ending extension ✓

High efficiency irrigation systems (HEIS) include

1. A drip and sprinkler systems ✓
2. B only warabandi paperwork ✓
3. C only mogha enlargement without design ✓
4. D only flood basins ✓

Soil salinity can be diagnosed in the field by

1. A white salt crusts, poor germination and high EC readings ✓
2. B deep green lush growth always ✓
3. C low EC always ✓
4. D high OM alone ✓

Reclamation of saline soils typically requires

1. A adding more common salt ✓
2. B leaching with adequate drainage ✓
3. C sealing the profile ✓
4. D stopping all water movement ✓

Biosaline agriculture uses

1. A only freshwater rice everywhere ✓
2. B banning halophytes ✓
3. C ignoring EC ✓
4. D salt-tolerant crops/forages on saline lands ✓

Irrigation scheduling can be based on

1. A only calendar guesswork forever ✓
2. B soil moisture, ET estimates and crop stage ✓
3. C ignoring weather ✓
4. D random flooding ✓

Pan evaporation data help estimate

1. A reference evaporative demand for irrigation planning ✓
2. B soil N content ✓
3. C seed purity ✓
4. D cotton lint % ✓

Command area of a canal is the

1. A only the dam reservoir surface ✓
2. B only the river catchment abroad ✓
3. C fertilizer factory yard ✓
4. D area designed to be irrigated by that canal system ✓

Tail-end farmers on watercourses often suffer

1. A excess water always ✓
2. B perfect equity always ✓
3. C unreliable and inadequate water supply ✓
4. D zero conveyance loss benefit issues ✓

Lining of canals and watercourses reduces

1. A crop ET demand to zero ✓
2. B rainfall ✓
3. C seepage losses ✓
4. D photosynthesis ✓

Groundwater quality in parts of the Indus basin is

1. A uniformly distilled water ✓
2. B always rainwater quality ✓
3. C free of all dissolved solids ✓
4. D highly variable, with extensive saline zones ✓

Using marginal quality water safely may require

1. A cyclic/blending use, salt-tolerant crops and monitoring ✓
2. B unlimited use on all crops without care ✓
3. C ignoring SAR and EC ✓
4. D banning soil tests ✓

Water table depth monitoring helps to

1. A measure only air humidity ✓
2. B count insects ✓
3. C detect waterlogging risk early ✓
4. D price wheat ✓

Evaporation from bare wet soil is reduced by

1. A removing all cover ✓
2. B frequent bare tillage when wet ✓
3. C increasing wind at surface always ✓
4. D mulching and residue cover ✓

Irrigation efficiency at basin scale is complicated because

1. A all seepage disappears forever unused ✓
2. B efficiency concepts never apply ✓
3. C water is not conserved physically ✓
4. D 'losses' may recharge groundwater used elsewhere ✓

Flood irrigation on uneven fields causes

1. A perfect uniformity always ✓
2. B zero runoff ✓
3. C automatic fertigation ✓
4. D over-irrigation in low spots and stress on high spots ✓

Intermittent irrigation of wheat should avoid stress especially at

1. A only after harvest ✓
2. B crown root initiation, tillering, booting and grain filling ✓
3. C only during seed storage ✓
4. D only in midsummer fallow necessarily ✓

Saline-sodic soils need

1. A only mulching without amendments ✓
2. B both sodium displacement (e.g., gypsum) and leaching with drainage ✓
3. C only N fertilizer ✓
4. D only deep plowing without water ✓

Tube well density increase in Punjab contributed to

1. A end of irrigation need ✓
2. B ban on Rabi wheat ✓
3. C higher cropping intensity and groundwater exploitation ✓
4. D rise of only rainfed farming ✓

Surface drainage is needed to remove

1. A only deep aquifer brine always ✓
2. B excess rainfall and irrigation runoff ✓
3. C fertilizer bags ✓
4. D soil texture ✓

Watercourse renovation typically includes

1. A destroying moghas ✓
2. B raising water tables ✓
3. C lining, desilting and improving outlets/nakkas ✓
4. D adding salts ✓

Crop coefficients (Kc) are used to

1. A measure soil bulk density ✓
2. B grade cotton lint ✓
3. C convert reference ET to crop ET ✓
4. D set support prices ✓

Deficit irrigation intentionally

1. A always maximizes water use ✓
2. B floods fields continuously ✓
3. C applies less than full ET to save water with acceptable yield trade-offs ✓
4. D ignores crop stages ✓

Phreatophytes indicate

1. A deep dry aquifers only ✓
2. B shallow groundwater conditions ✓
3. C zero water table influence ✓
4. D only atmospheric drought ✓

Salt balance of an irrigated field is maintained when

1. A all irrigation stops forever ✓
2. B salt in ≈ salt out via drainage/harvest over time ✓
3. C evaporation removes salts as gas ✓
4. D plants create infinite freshwater ✓

IbIS modernization goals include

1. A improving measurement, equity and efficiency of water delivery ✓
2. B abandoning agriculture ✓
3. C closing all barrages ✓
4. D ending provincial coordination ✓

Barrages on the Indus system are used to

1. A divert river water into canal commands ✓
2. B generate only nuclear power ✓
3. C desalinate seawater ✓
4. D store Himalayan snowpack in fields ✓

A practical first step against farm-level salinity is

1. A improving drainage and avoiding continuous over-irrigation ✓
2. B adding table salt ✓
3. C blocking drains ✓
4. D raising water table ✓