Effects of irrigation amount and nitrogen synergists on yield and utilization of water and fertilizer of summer maize
To explore the comprehensive effects of water and nitrogen synergists on the growth and utilization of water and fertilizer of summer maize,summer maize field experiments were carried out under two irrigation levels of 40 mm(W1)and 60 mm(W2).Five nitrogen applications including no nitrogen(NO),urea(U),urea+ni-trification inhibitor(U+DCD),urea+urease inhibitor(U+NBPT),urea+double-effect inhibitor(U+N+D)were implemented.The results showed that urea combined with urea synergist significantly increased summer maize yield,aboveground biomass at maturity,net income,water use efficiency and partial productivity of nitrogen fertil-izer compared with urea alone.The increases were 5.92％～13.82％,5.85％～18.07％,11.12％～24.30％,12.35％～41.83％and 5.93％～13.80％,respectively,and urea combined with double-effect inhibitor had the best effect.The application of urease inhibitor and double-effect inhibitor also reduced the accumulation of ammonia volatiliza-tion and the residual amount of nitrate nitrogen in mature soil of summer maize field,among which urea combined with urease inhibitor had the best effect.Compared with W1,urea combined with double-effect inhibitor treatment at W2 level improved the yield,aboveground biomass,net income,water use efficiency,and partial productivity of nitrogen ferilizer at maturity by 10.54％,15.51％,19.40％,20.31％and 27.36％,respectively.The treatment of u-rea combined with urease inhibitor decreased the accumulation of ammonia volatilization and residual amount of ni-trate nitrogen in summer maize field soil by 11.33％and 48.46％,respectively.Considering the economic benefits,environmental benefits,water and fertilizer utilization efficiency,and plant growth of the summer maize fertilization and irrigation scheme,a fuzzy comprehensive evaluation system was established,and the optimal treatment was urea combined with double-effect inhibitor under 60 mm irrigation.
irrigation amountnitrogenous synergistsoil ammonia volatilizationsoil nitrate nitrogen residuesummer maize yieldutilization of water and fertilizer
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维普
