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A serious shortage of water resources in China and the 13 freshwater resources in the world's poorest countries in the world . Shanxi Province, the arid and hilly area of arable land , drought is particularly problematic ; and crop interim , serious difficulties due to the dry fertilizer , fertilizer waste , how to look for more effective water-saving in the conditions of limited water resources , fertilizer method , has become an important part of the agricultural research . Lot of information and careful testing based on the vertical distribution of migration dynamics and N , P , K elements in the soil with drip irrigation drip irrigation in the soil . The results show that : (1) soil moisture below the wilting coefficient under dry conditions , the trace points drip , drip point the soil moist surface diameter x depth of penetration of the maximum vertical plane Y was significantly related to the mathematical model : Y = -0.0212 x ~ 2 1.8546x-17.88, the correlation coefficient R = 0.9350 ( 2 ) in the case of micro- irrigation replenishment , only large irrigation to 4000ml / points , in order to make drip irrigation to reach the central layer of crop root penetration to 20 cm soil layers below , or moisture difficult to be absorbed by crops , to cause drip irrigation waste . ( 3 ) N , P , K elements in the soil vertical distribution : N prime with strong liquidity drip irrigation in the soil , in the 30-40cm layer gathering a large amount ; P prime and K prime in the soil on Migration Law is basically similar to the accumulation of soil surface to 30-40cm soil layer , K ... content close to that of the control , indicating that the soil surface drip irrigation Potassium is not particularly meaningful .
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