# INDIAN GEOGRAPHY

## AGRICULTURE

### IRRIGATION INDIA

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the moisture depth available for evapotranspiration in root zone of 1m depth soil, if dry weight of soil is 1.5 g/cc, field capacity is 30% and permanent wilting point is 10%?
 A 300 mm B 150 mm C 250 mm D 30mm
Explanation:

Detailed explanation-1: -Q7 The depth of moisture in root zone at field capacity and permanent wilting point per m depth of soil are 0.5 m/m and 0.2 m/m respectively.

Detailed explanation-2: -Available water holding capacity (AWC) It is the water held between field capacity and permanent wilting point. The total available water in the soil root zone for a specific crop is equal to the cropâ€™s rooting depth multiplied by the available water-holding capacity per unit depth of the soil.

Detailed explanation-3: -Adjusted RAW = 60mm/m x 0.8 = 48mm/m. Hence, for a rooting depth of 0.3m: Total root zone RAW = 48mm/m x 0.3m = 14.4mm. If your irrigation system wets the entire cropped area, use this figure (RAW mm) to schedule irrigations.

Detailed explanation-4: -Example-2.1 Depth of water in root zone at field capacity and permanent wilting point are 0.5 m per metre depth of soil and 0.2 m per metre depth of soil.

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