| Effects of biochar levels on winter wheat yield and water-use efficiency in Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2018.06.24 |
| Key Words: biochar levels straw return winter wheat water use efficiency crop yield |
| Author Name | Affiliation | | SUN Hai-ni | Collegeof Natural Resources and Environment, Northwest A&F University,Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Shi-wen | Collegeof Natural Resources and Environment, Northwest A&F University,Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | LI Yu-lin | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | YANG Wen-jia | Collegeof Natural Resources and Environment, Northwest A&F University,Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | YIN Xiu-shuai | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | Yin Li-na | Collegeof Natural Resources and Environment, Northwest A&F University,Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | DENG Xi-ping | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| A field trial was conducted to study the effects of biochar application rates and the straw-return on soil water content, soil nutrient, crop yield, and water use efficiency. There were five treatments:no biochar(CK), 15 t·hm-2 biochar(BC1), 30 t·hm-2biochar(BC2), 45 t·hm-2 biochar(BC3), and straw-return. Results showed that the soil NO-3-N, NH+4-N, available K, and organic matter content increased with increasing application rates of biochar in all growth stages of wheat.Soil water storage, available P, and crop yield, water-use efficiency increased initially but decreased subsequently with increasing application rates of biochar. Compared to the control and other biochar rates,the 30 t·hm-2 of biochar significantly achieved peak yield (a 17.2% increase over CK to 6 640 kg·hm-2) and water-use efficiency (an increase of 17.8% to 18.1 kg·hm-2·mm). The straw-return increased yield by 10.5% but no effect on the water-use efficiency. Therefore, applying the appropriate rate of biochar can significantly improve soil fertility, crop yield, and water-use efficiency. |
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