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| Effects of Controlled-release Nitrogen Fertilizer on Yields and Soil Nitrogen in Onion-Cotton Intercropping System |
| Received:November 20, 2014 |
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| KeyWord:nitrogen fertilizer type;nitrogen rate;onion yield;cotton production;soil inorganic nitrogen |
| Author Name | Affiliation | E-mail | | TIAN Xiao-fei | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering and Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | | | LI Cheng-liang | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering and Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | chengliang_li11@163.com | | ZHANG Min | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering and Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | minzhang-2002@163.com | | XIE Zhi-hua | Jining Academy of Agricultural Sciences, Institute of Cotton Research, Jining 272000, China | | | LU Yan-yan | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering and Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | | | ZHENG Wen-kui | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering and Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | | | GENG Ji-biao | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering and Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China | |
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| Abstract: |
| Controlled-release nitrogen fertilizer(CRN) could meet plants' demands for nitrogen while reducing nitrogen losses and thus water pollution. A field experiment was conducted in Jining city, Shandong Province, from September 2012 to October 2013, to study the crop growth and soil nitrogen levels in onion and cotton intercropping system under common fertilizer(CN) and CRN at four nitrogen(N) rates of 0, 100, 200, and 300 kg·hm-2. Results showed that the cotton yield increased with N applications. At 200 and 300 kg·hm-2, the cotton yields were respectively 17.3% and 7.7% higher in CRN than in CN. In CRN treatments, the cotton yield at 200 kg·hm-2 was 7.7% and 14.5% higher than that at CN(200 kg·hm-2) and CRN(100 kg·hm-2), respectively. However, no difference was found in the cotton yield between 200 kg·hm-2 and 300 kg·hm-2 CRN treatments. At 100, 200, and 300 kg·hm-2, onion yields were respectively 19.6%, 2.6% and 6.7% higher in CRN than in CN. Soil NO3--N concentrations in 0~20 cm in CRN treatment were significantly lower than in CN treatment. Soil NH4+-N contents were not affected by N treatments. These results suggest that 200 kg·hm-2 of CRN would be an optimum fertilizer rate under the experimental condition. |
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