| Effects of previous crop stubbles and nitrogen applied amount on summer maize yield and soil organic carbon pool at a semiarid loess site of China |
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| DOI：10.7606/j.issn.1000-7601.2018.01.03 |
| Key Words: winter rape/wheat rotation nitrogen application summer maize yield soil organic carbon |
| Author Name | Affiliation | | SUN Xiao-hua | Potato Research Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | NIU Jun-yi | Agronomy College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Gang | Dryland Agricultural Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to identify the effects of different previous crop stubbles and nitrogen applied amount on summer maize yield and soil organic carbon pool at a semiarid loess site of China, a field experiment was conducted with three nitrogen fertilizer application rates: 0 kg·hm-2 (N0), 120 kg·hm-2 (N120), 240 kg·hm-2 (N240) under previous winter rape and winter wheat crops stubbles respectively at Zhenyuan, Gansu province, China. The results showed that, the summer maize yield was increased by 9.76%～24.88% and 12.56%～22.50% under previous winter rape and winter wheat crops stubbles compared with no control N0 (CK) respectively. Especially, the yield of summer maize in condition of previous winter rape crop was 6.40%～11.05% higher than that under winter wheat crop. Under different nitrogen supply levels within each of crop stubbles, the orders of successively decreasing in content of total soil organic carbon (TOC) was N240＞N120＞N0, and the content of total soil organic carbon under winter rape crop was 1.07～1.70, 1.07～1.93 g·kg-1 and 0.77～1.60 g·kg-1 higher than that under winter wheat crop. The contents of easily oxidized organic carbon (EOOC) and particu1ate organic carbon (POC) increased with the nitrogen amount under both previous winter rape and winter wheat crops. However, the contents of EOOC and POC under winter rape crop was 0.09～4.91 mg·kg-1 and 0.05～0.27 g·kg-1 higher than that under winter wheat crop respectively. The contribution of nitrogen application to contents of EOOC and POC was 0.34%～3.45% and 10.14%～51.41% respectively. Therefore, manure application with nitrogen fertilizers to soil was both beneficial to yield of summer maize increase and organic carbon pools upgrade in soil at a semiarid loess site of China. And multiple cropping summer maize should be adopted in the field with winter rape stubble; the optimal nitrogen fertilizer fertilization for summer maize was 240 kg·hm-2 nitrogen (N240) for the experimental area. |
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