【摘要】 研究沼气发酵产生的厌氧发酵残余物 (沼液、沼渣 ,以下简称沼肥 )在培肥土壤过程中土壤速效氮的变化及对油菜硝酸盐含量的影响 ,为沼气综合利用提供新的理论和技术依据。试验表明 :与化肥相比 ,适量施用沼肥 ,可有效减少油菜硝酸盐的积累 ;沼肥中配施化肥 (简称沼化肥 ) ,随化肥氮比例增加 ,油菜硝酸盐含量增加。栽培过程中 ,硝态氮是土壤中速效氮的主要形态。与化肥相比 ,沼肥的硝化作用缓慢 ,土壤中硝态氮的含量较低 ,从而使沼肥和沼化肥处理的油菜中硝酸盐积累量较少。利用沼肥可替代部分化肥 ,生产无公害农产品 ,使沼气工程的经济效益、社会效益和生态效益大大提高。更多还原

【Abstract】 The experiments in pot culture were conducted to study the effects of Anaerobic Fermentation Residues (AFR) on nitrate accumulation in rape and available nitrogen in soil in order to provide new way for the comprehensive utilization of biogas engineering.The results showed that compared to chemical fertilizer, AFR could decrease the nitrate accumulation in rape. Nitrate content in plant tissue was increased with the percentage of chemical nitrogen in the mixture of chemical fertilizer and AFR. Nitrate was the main form of available nitrogen in soil. Lower nitrate content in soil was due to the slow nitrification in soil with AFR application, which begot the lower nitrate accumulation in rape. The economical, social, and ecological benefits of biogas engineering would be improved greatly by the utilization of biogas residues on the production of safe food.更多还原