The Effect Of Coupling Of Water And Fertilizer On Maize Yield

The effect of coupling of water and fertilizer was studied by the design of orthogonal and pot experiment.The influence of coupling effect between water and fertilizer on growth,dynamic varieties of dry matter and nutrient accumulation,fertilizer recovery rate,irrigation rate,content of soil nutrition and yield were studied in this experiment.The main results were summarized as follows:1 The results indicated that the water was a key factor on the height of maize,leaf area,roots and biological quantity during elongation stage under different water and fertilizer.2 The results under different water and fertilizer showed that the dry matter and nutrient accumulation were continuously increased with plant growth,and their accumulation in different plant-growing period was shaped in S curves that could be described by the exponential regression equations.The momentary rate of the dry matter and nutrient uptake was obtained by the regression equations for the first derivatives.At the same time,the time for the maximum absorptive rate was obtained by the regression equations for the second derivatives.The time for accumulation of maximum dry matter is 33.56d～68.06d after the maize emergence,the times for accumulation of N,P,K are 14.73 d～64.19d,45.23d～80.64d,18.80d～53.91d respectively.3 The results under different water and fertilizer showed that the N recovery rate was between 2.15%and 18.25%.Of all treatments,the N recovery rate of treatment 1 was lowest,treatment 4 was highest.The P recovery rate was between 1.60%and 15.33%.Of all treatments,the P recovery rate of treatment 2 was lowest,treatment 4 was highest.The K recovery rate was between 7.98%and 79.04%.Of all treatments,the K recovery rate of treatment 8 was lowest, treatment 7 was highest.4 The result under different water and fertilizer showed that the irrigation rate was between 1.455 g/kg and 4.228 g/kg.Of all treatments,the irrigation rate of treatment 1 was lowest,treatment 5 was highest.Factor corporation when the irrigation rate get to the maximum 6.006 g/kg was that W 74.516%,N 3.18g/plot,P 1.60 g/plot,K 0.71 g/plot.5 The results under different water and fertilizer showed that the content of soil total N was between 0.139%and 0.265%.Of all treatments,the soil total N of treatment 8 was lowest, treatment 1 was highest.The content of soil hydrolyzable N was between 154.07mg/kg and 198.29 mg/kg.Of all treatments,the soil hydrolyzable N of treatment 1 was lowest,treatment 8 was highest.The content of soil total P was between 1.1942g/kg and 1.5968 g/kg.Of all treatments,the soil total P of treatment 5 was lowest,treatment 3 was highest.The content of soil available P was between 65.69mg/kg and 91.71mg/kg.Of all treatments,the soil available P of treatment 1 was lowest,treatment 3 was highest.The content of soil total K was between 9.13g/kg and 10.91 g/kg.Of all treatments,the soil total K of treatment 1 was lowest,treatment 4 was highest.The content of soil available K was between 211.8mg/kg and 362.9mg/kg.Of all treatments,the soil available K of treatment 5 was lowest,treatment 8 was highest.6 The result under different water and fertilizer showed that the yield was between 16.44 g/plot and 102.75 g/plot.Of all treatments,the yield of treatment 1 was lowest,treatment 5 was highest. When the yield got to the maximum 129.49 g/plot,the factor corporation was that W 88.15%,N 2.62g/plot,P 1.60 g/plot,K 1.26 g/plot.