What is the key relationship between irrigation and drainage?
A
Irrigation and drainage are independent
B
More irrigation always reduces the need for drainage
C
Proper irrigation requires adequate drainage
D
Drainage systems are only needed during floods
Analysis & Theory
Efficient irrigation depends on good drainage to avoid waterlogging and maintain soil health.
Excessive irrigation without proper drainage leads to:
C
Waterlogging and salinization
D
Reduced groundwater recharge
Analysis & Theory
Without drainage, excess irrigation causes waterlogging and salt accumulation in the soil.
Drainage is especially important in irrigated fields because it:
B
Prevents nutrient uptake
C
Removes excess water and salts
Analysis & Theory
Drainage helps maintain balance by removing surplus water and controlling salinity.
Why is drainage critical in areas with intensive irrigation?
C
To remove excess irrigation water and prevent water table rise
Analysis & Theory
Without drainage, excess water from irrigation can raise the water table and cause crop damage.
An efficient irrigation system must be supported by:
Analysis & Theory
Drainage is essential to prevent water accumulation and to maintain favorable soil conditions.
Improper drainage in irrigated lands may result in:
C
Salinity buildup in root zone
Analysis & Theory
Salts may accumulate in the soil when drainage is inadequate in irrigated lands.
Irrigation without drainage can cause rise in:
Analysis & Theory
Continuous irrigation without drainage leads to groundwater table rise and waterlogging.
What is the function of drainage in salt-affected irrigated areas?
B
To increase soil erosion
D
To reduce crop transpiration
Analysis & Theory
Drainage helps leach and remove salts from the soil profile in irrigated areas.
What must accompany efficient irrigation in heavy clay soils?
Analysis & Theory
Heavy soils retain water; thus, proper drainage is necessary to prevent waterlogging.
The balance between irrigation and drainage ensures:
B
Optimal soil moisture and aeration
C
High evaporation losses
Analysis & Theory
Proper balance ensures that crops receive enough water while avoiding saturation and poor aeration.