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| Infiltration water nitrogen loss and rice nitrogen accumulation in a paddy field fertilized with a combination ratio of cow manure and chemical fertilizer |
| Received:May 27, 2018 |
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| KeyWord:rice;cow manure;combination ratio;infiltration water;loss;nitrogen accumulation |
| Author Name | Affiliation | E-mail | | LI Min | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | WANG Chun-xue | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | SHU Zheng-wen | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | WANG Zhao | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | CHEN Jian-jun | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | liyuan@ynau.edu.cn | | ZU Yan-qun | College of Resources and Environment, Yunnan Agricultural University, Yunnan Engineering Laboratory for Agricultural Environment Pollution Control and Ecological Remediation, Kunming 650201, China | | | ZHANG Ke-qiang | Dali Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture and Rural Affairs, Dali 671004, China | |
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| Abstract: |
| Field plot experiments with spatial and temporal variations of total nitrogen (TN), ammonium nitrogen (NH4+-N), and nitrate nitrogen (NO3--N) in paddy soil at 20, 40 cm, and 60 cm of infiltration water were used to study nitrogen leachate loss and nitrogen accumulation in rice using four different proportions of cow manure and chemical fertilizer. The results showed that the loss of TN, NH4+-N, and NO3--N in all treatments was greater during the tillering stage of rice, in which NH4+-N contributed to the greatest nitrogen loss, accounting for 64.3%~76.7% of TN loss. Less nitrogen loss occurred during the later growing period. The TN time-interval weighted average concentration of infiltration water at 60 cm was higher than that of upper layers at 50%CF+50%MF, whereas all other treatments showed a decrease with increasing depth. Nitrogen loss was highest for the 50%CF+50%MF treatment at 23.12 kg·hm-2, which was significantly higher than other treatments. Rice yield decreased with an increase of cow manure fertilization but there was no significant difference between the four treatments. The 30%CF+70%MF treatment significantly reduced nitrogen accumulation in rice aboveground, which was not conducive to the absorption and utilization of nitrogen in rice. Therefore, considering the rice yield and nitrogen loss, 70%CF+30%MF is recommended as the optimal fertilizer and cow manure fertilization ratio. |
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