The precipitation design used in the calculation of irrigation mode for rice service enjoy is the precipitation falling on the area decimated countries occurred. The area eventually changed due to water methods of cultivation, the week is characterized during cultivation is not the entire fields are entered a period of wear and tear of area water water that gradually increases from the start to the second day of the transplants tg when all the rice are both entered a period of wear and water. Then on to th stable and then continue down to zero in on Wednesday (tg + th) because the rice turn ended the period of wear and water. The precipitation to fall on the obviously occurs the process decimated the country is determined by the following formula:
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