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| The effects of successive whole-dose biochar application on rice yield and soil nutrient concentrations |
| Received:November 20, 2017 |
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| KeyWord:successive whole-dose biochar application;rice yield;soil nutrients |
| Author Name | Affiliation | E-mail | | ZHANG Lu | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China | | | DONG Da | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
School of Environmental & Resource Sciences, Zhejiang A & F University, Hangzhou 311300, China | | | PING Fan | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China | | | XU Xing-kun | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China | | | YI Qian-qian | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China | | | SUN Xue | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China | | | WU Wei-xiang | Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China | weixiang@zju.edu.cn |
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| Abstract: |
| A 4-year experiment (2013-2016) was conducted in a paddy field of medium soil fertility under a single cropping system in north Zhejiang Province to investigate the effects of successive whole-dose biochar applications on rice yield and soil nutrient concentrations and the associated mechanisms. Three treatments were employed:CK (control, i.e., without straw or biochar addition), RS (rice straw applications at 8 t·hm-2·a-1), and RSB (successive rice straw-derived biochar applications at 2.8 t·hm-2·a-1). Rice plant height, grain yield, soil pH, cation exchange capacity (CEC), concentrations of total carbon (TC) and total nitrogen (TN), available contents of P, K, Ca, Mg, Zn, Al, Fe, and Mn in paddy soil samples were determined for each harvested time. Results showed that compared with CK, the RSB treatment significantly (P<0.05) increased rice height and grain yield, and the increase of rate with the RSB treatment was higher than that with the RS treatment; The RSB treatment led to higher concentrations of soil TC and TN and available contents of P, K, Mg, and Ca, but lower soil available contents of Al, Fe, and Mn; The improvement of soil nutrients with RSB was most likely due to the biochar indirectly enhancing the accumulation of C, N, and available nutrients in the soil; The increase in concentrations of the soil TC and TN and available contents of K and Mg and the decrease in available content of Al with the RSB treatment might be the key factors that contributed to the rice yield increase. Therefore, the consistent increases in rice yield and soil nutrient concentrations in the 4-year RSB treatment demonstrate that successive whole-dose straw-derived biochar application is a promising approach for straw resource utilization. |
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