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| Effect of single application of water-borne polymer coated controlled-release blend fertilizer on nitrogen utilization in rice |
| Received:July 22, 2015 |
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| KeyWord:water-borne polymer coated controlled release blend fertilizer;one-time fertilization;nitrogen utilization;soil headspace;ammonia volatilization;nitrous oxide emission |
| Author Name | Affiliation | E-mail | | XIN Zhi-yuan | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | WANG Chang-quan | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | w.changquan@163.com | | SHEN Ya-zhen | The State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | MA Fei | The State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Jian-min | The State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | DU Chang-wen | The State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | chwdu@issas.ac.cn |
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| Abstract: |
| A field experiment was conducted to study the effects of one-time fertilization of water-borne polymer coated controlled release blend fertilizer on rice growth, rice yield, plant nitrogen absorption, soil nitrogen dynamics and nitrogen-containing gas emissions(NH3 and N2O). Rice cultivar used was Nanjing 46. Three treatments were no fertilization, conventional fertilization, and one-time fertilization of water-borne polymer coated controlled release blend fertilizer(controlled release nitrogen accounted for 30%). One-time fertilization treatment increased rice yield to 6 506.9 kg·hm-2 from 6 201.9 kg·hm-2 in the conventional fertilization, but slightly reduced NH3 and N2O average concentrations in soil headspace to 18.63 μmol·mol-1 and 7.74 μmol·mol-1 from 19.14 μmol·mol-1 and 8.40 μmol·mol-1 in the conventional fertilization, respectively. The residual nitrate nitrogen and ammonium nitrogen in soil showed an increase tendency in the one-time fertilization. The agronomic efficiency of nitrogen was 7.81 kg grain·kg-1 N for the conventional fertilization, while it was 9.09 kg grain·kg-1 N for the one-time fertilization. Therefore, the one-time fertilization showed more stable nitrogen supply, and also improved nitrogen utilization efficiency. |
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