Effects of Controlled Release Urea on Wheat Yield and Nitrogen Utilization Efficiency Under Different Applied Conditions

• Main Authors: XIA Wei-guang, WU Ji, GAO Feng-me, WANG Yun-qing, GUO Xi-sheng
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2014-02-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: coated controlled-release urea(CRU); yield; Nitrogen utilization; economic benefit; winter wheat
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2014/1/20140106.htm
• ISSN: 2095-6819; 2095-6819

The field trial was conducted to study the effects of different nitrogen fertilizer applications on winter wheat yield, nitrogen utilization efficiency and economic benefit. 7 treatments were designed as CK(no nitrogen fertilizer applied), 100%PU10/0(conventional urea applied before sowing, N rate was 240 kg·hm-2), 100%PU6/4(conventional urea applied before sowing and at jointing with the ratio of 6∶4, N rate was 240 kg·hm-2), 80%PU6/4(conventional urea applied before sowing and at jointing with the ratio of 6∶4, N rate was 192 kg·hm-2), 100%CRU(resin coated controlled release urea applied before sowing, N rate was 240 kg·hm-2), 80%CRU(resin coated controlled release urea applied before sowing, N rate was 192 kg·hm-2), and 40%CRU+40%PU(resin coated controlled release urea and conventional urea applied before sowing, N rate was 192 kg·hm-2). The results showed that no matter on the efficiency of yield or that of nitrogen, resin coated controlled-release urea(CRU) was better when compared with conventional urea(PU). Especially, the combined application treatment(40%CRU+40%PU)was the best with achieving the highest wheat yield of 7 709 kg·hm-2, the highest N fertilizer utilization efficiency of 36.44% and the maximum net income of 15 946 yuan·hm-2. And it could not only increase winter wheat yield with reducing the nitrogen fertilizer application, but also improve N fertilizer utilization efficiency and owe the highest ratio of output to input. Therefore, the combined application of the resin coated controlled-release urea and conventional urea(40%CRU+40%PU)was the optimal nitrogen fertilizer treatment under the conditions of this experiment.