Effect of Balanced Fertilization on Greenhouse Tomato Yield in Suburban Yinchuan

Based on the analysis of soil in the test points,the general rotation combination design of quadruple quadratic regression was carried out to study the effects of organic fertilizer,nitrogen fertilizer,phosphate fertilizer and potash fertil-izer on tomato production in the second generation energy saving greenhouse in the suburbs of Yinchuan.The results showed that the soil charactered low nitrogen,high phosphorus and high potassium,meanwhile because of application of large quantity of fertilizer and poor drainage,soil featured low-grade salinization.And the response of tomato to organic fertilizer,nitrogen fertilizer,phosphate fertilizer,potash fertilizer is:nitrogenpotassiumorganic fertilizerphosphate.If the tomato yield reach the highest value,122.97 t/hm2,the combination of four fertilizer should be organic manure(M)7 500 kg/hm2,nitrogen(N)867.6 kg/hm2,phosphate(P2O5)60 kg/hm2 and potash(K2O)405 kg/hm2.And if tomato production achieve over 115.26 t/hm2 stably,meanwhile the soil can be used continuously,it should be organic manure 15 000 kg/hm2,N 850 kg/hm2,P2O5 300 kg/hm2,K2O 400 kg/hm2,N∶P2O5∶K2O for 8.5∶3∶4.