Analysis of Water-Potassium Coupling Effect of Drip Irrigation under Mulch on Seed-maize in Hexi Oasis
A two-year field experiment was carried out in Xinfeng Village,Shahe Town,Linze County,Zhangye City,with low water(2 880 m3/ha),medium water(3 840 m3/ha)and high water(4 800 m3/ha).Three irrigation quota levels and three potassium application levels of low potassium(60 kg/ha),medium potassium(120 kg/ha)and high po-tassium(180 kg/a)were used in a split plot design,a total of 9 treatments.The effects of different water and potassi-um supply on seed maize yield and its components in oasis irrigation area were studied.The results showed that un-der the coupling effect of water and potassium,the highest combination of yield,100-grain weight and dry matter quality was adequate irrigation with middle potassium application rate treatment,which was 8 819.90 kg/ha,27.05 g,235.31 g/plant,respectively.In the field of drip irrigation under mulch in Hexi oasis irrigation area,the relationship between irrigation amount,potassium application amount and seed maize yield conforms to the binary quadratic re-gression model.The model predicts that the yield is highly correlated with the actual yield.The model analysis showed that the yield increases first and then decreases with the amount of water and potassium input.The water and potassium combination schemes under different target yields were obtained by model optimization.In this exper-iment,when the yield is within the target range of 8 000-9 000 kg/ha,the optimal irrigation amount is 4 128.00-4 623.36 m3/ha,and the potassium application amount is 126.24-161.76 kg/ha.
MaizeDrip irrigation under mulchIrrigation and potassium coupling effectYieldRegression model
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