Abstract

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Title:: Effect of Different Nitrogen Fertilizer Treatments on Yield and Fertilizer Utilization Ratio of Tomato

Author(s):: WU Xinyi1; 2; HU Xiaohui1; 2; QU Feng1; 2; LI Suzhi1; 2; XU Jiaojiao1; 2; LI Jianming1; 2; (1.College and Horticulture,Northwest A & F University,Yangling,Shaanxi 712100;2.Key Laboratory of Protected Horticulture Engineering in Northwest China,Ministry of Agriculture,Yangling,Shaanxi 712100)

Keywords:: greenhouse tomato; nitrogen reduction; yield; soil enzyme activity; fertilizer utilization rate

Abstract:: Taking ‘Rongwei’ tomato as experimental material,four fertilization levels were set up by means of random block arrangement in the field,no fertilization (CK);the basic nitrogen was calculated based on target yield (T1);reduce nitrogen fertilizer by 30% treatment (T2),120% organic fertilizer treatment (T3),the effect of the growth index and soil enzyme activity of tomato under four fertilization levels was studied.The results showed that the difference of growth index between T2 and T1 was not obvious,T2 was significantly higher than CK and T3.The urease,sucrose enzyme,catalase and phosphatase activity of T2 were the highest in the harvest time.The utilization rate of fertilizer of T2 was the highest.The utilization rate of nitrogen,phosphorus and potassium was 36.66%,60.51% and 26.19%,respectively.The partial factor productivity was 237.17 kg·kg-1.The yield was 9 952 kg for every 667 m2,with a significant increase of 79% compared with T1.To sum up,reducing nitrogen fertilizer by 30% treatment(N：21.01 kg;P2O5:2.71 kg;K2O:18.24 kg for every 667 m2) has the highest yield and the best fertilization effect.