Effects of Biochar and Super Absorbent Polymer on Substrate Properties and Water Spinach Growth

查看全文 作　　者：FAN [1]Ruqin;LUO [1]Jia;YAN [1]Shaohua;ZHOU [1]Yunlai;ZHANG [1,2]Zhenhua

机构地区：[1]Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences;[2]School of Earth and Environment,The University of Western Australia

出　　处：《Pedosphere》索引2015年第25卷第5期,共12页

基　　金：supported by the National Natural Science Foundation of China (No.41401259);the General Financial Grant from the China Postdoctoral Science Foundation (No.2014M551528);the Independent Innovation Project of Jiangsu Province,China (No.CX(14)2035);the Special Scientific Research Fund of Agricultural Public Welfare Profession of China (No.201203050) 摘　　要：Most previous researches have focused on biochar application in agricultural soils; however, limited information is available concerning the effects of biochar amendment on greenhouse substrate properties. A greenhouse experiment was conducted to investigate effects of wheat straw biochar(0–160 m L L-1) and super absorbent polymer(SAP, 0.8 g L-1) on physical and chemical properties of a substrate based on spent pig litter compost and the growth of water spinach(Ipomoea aquatica Forsk). Total porosity, water-holding capacity, p H and electrical conductivity(EC) of the substrate significantly increased with increasing biochar rates, especially in the substrate without SAP. The values of p H and EC were significantly lower in the substrate with SAP than those without SAP at the high biochar application rates(100–160 m L L-1). The germination rates of water spinach decreased with increasing biochar rates when biochar was added alone(76.9%–83.7%), whereas the rates increased to 83.6%–85.8% when biochar was added in combination with SAP. Growth parameters of water spinach and nutrient uptake by shoots and roots increased with increasing biochar rates and reached the maximum values at the biochar rate of 100 m L L-1. There were significant cubic relationships between the uptake of nutrients(N, P, and K) and biochar rates, both with and without SAP addition. In order to avoid negative effects on plant growth,the biochar application rate should be controlled at an optimal level(100 m L L-1). The SAP addition not only enhanced the positive effects of biochar application on the properties of the substrate, but also inhibited the excessive rise of p H and EC following biochar additions, which led to better plant growth and enhanced nutrient uptakes by water spinach. 关键词：高吸水性聚合物生长参数生物炭化学性质菠菜底物温室试验植物生长

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Effects of Biochar and Super Absorbent Polymer on Substrate Properties and Water Spinach Growth

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