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| Research on P loss risk and threshold value in typical double-cropping rice field |
| Received:March 12, 2017 |
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| KeyWord:phosphorus;loss;threshold;double-cropping rice |
| Author Name | Affiliation | E-mail | | ZHU Jian | Longping Branch of Graduate School of Central South University, Changsha 410125, China
Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | JI Xiong-hui | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | 1546861600@qq.com | | TIAN Fa-xiang | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | WU Jia-mei | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | LIU Zhao-bing | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | PENG Hua | Longping Branch of Graduate School of Central South University, Changsha 410125, China
Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | LIU Sai-hua | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | GUAN Di | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | | | XIE Yun-he | Hunan Academy of Agriculture Sciences/Ministry of Agriculture Key Laboratory of Agriculture Environment in Middle Reach Plain of Yangtze River/Key Lab of Prevention, Control and Remediation of Soil Heavy Metal Pollution in Hunan Province, Changsha 410125, China | |
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| Abstract: |
| Effects of different rates of phosphorus (P) application on the grain yield,soil P accumulation,and risk of P loss through surface runoff were studied in double-cropping rice fields to determine the threshold values of the optimal P fertilizer application rates,using the field plot experiments during 2011-2013.The results showed that average yields of the early and late rice were 5474~5552 kg·hm-2 and 7096~7521 kg·hm-2 during the 3-year observation period,respectively,and excessive P fertilizer application did not significantly increase the rice yields,but in fact increased the risk of yield reduction.P fertilizer application significantly increased soil Olsen-P contents.The average total-P (TP) concentrations in the surface water of rice fields showed a significantly linear relationship with the soil Olsen-P contents.The dynamics of P concentrations could be simulated using the exponential model (Y=C0·ek/t,k > 0),suggesting that the risk of P loss through surface runoff would elevate with the increasing P fertilizer application rates.Considering the effects of P fertilizer application on rice yields,soil P surplus,and environmental risk of P loss,the recommended threshold for the optimal P fertilizer application rates were estimated to be (48.53±7.07) kg P2O5·hm-2 and (56.87±7.90) kg P2O5·hm-2 for the early and late rice,respectively,in southern China. |
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