Abstract

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Title:: Effects of Carbon Regulator on Physical and Chemical Characteristics of Secondary Salinized Soil

Author(s):: LU Yefeng1; SHENG Haijun1; 2; QIAN Xiaoqing1; 2; DU Yan1; FENG Ke1; 2; (1.College of Environmental Science and Engineering,Yangzhou University,Yangzhou,Jiangsu 225127；2.Cooperative Innovation Center of Organic Solid Waste Resources in Jiangsu,Nanjing,Jiangsu 210095)

Keywords:: carbon regulator; secondary salinization; physical and chemical properties; optimal dosage

Abstract:: Secondary salinization of greenhouse soil has seriously restricted the sustainable development of agriculture.In this study carbon regulator (straw and decomposing bacteria) was used as the test material,and Chinese cabbage was used as a model plant.Pot experiment was set up to investigate the influence of carbon regulator on the improvement of secondary salinized soils and to determine the optimal dosage of carbon regulator.Their growth parameters,including physiological and grain quality characteristics,were recorded and analyzed.The results showed that application of carbon regulator could significantly improve soil permeability and water retention capacity and prevent soil from acidification.Total soluble salt concentration was reduced significantly,with a more balanced composition of major salt ions.This was reflected by the increase in soil water soluble K content,and a decrease in nitrate.Nitrate accumulation in Chinese cabbage was significantly reduced as a consequence of nitrate reduction in soil,which thereby improved food safety of Chinese cabbage.As far as food safety and the practical application were concerned,from 20.0 g to 26.7 g carbon regulator per 1 kg soil was recommended as the optimal dosages.Further investigation is needed to determine the optimal carbon regulator application at a field scale.