Question

how many techniques to estimate the water requirement in field?​

Answer 1

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To calculate the amount of water you use, multiply the width times the length of your yard in feet to get the number of square feet of area. Then multiply that figure by 0.623 to come up with the number of gallons used (or use our calculator below).

Answer 2

Explanation:

Crop water requirements (CWR) refer to the amount of water required to compensate for evapotranspiration losses from a cropped field during a specified period of time. Crop water requirements are expressed usually in mm/day, mm/month, or mm/season, and they are used for management purposes in estimating irrigation water requirements, irrigation scheduling, and water delivery scheduling.

and here are the methods..

CWR = Kc * ETo * 15 = 0.5 * 3.5 * 15 = 26.2 mm/month.

CWR = Kc * ETo * 31 = 0.57 * 4.4 * 31 = 77.8 mm/month.

CWR = Kc * ETo * 30 = 0.94 * 5.1 * 30 = 143.8 mm/month.

CWR = Kc * ETo * 31 = 1.15 * 5.8 * 31 = 206.8 mm/month.

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