三种秸秆有机肥改良土壤次生盐渍化的效果及生物效应

Effects on Rape Biomass and Salty Concentration of Salinity Soil Applied with Three Straw Manures and Effective Dose

通过盆栽实验的方法,研究了三种秸秆有机肥对次生盐渍化土壤的EC值、硝酸根离子含量和油菜生物量的影响。结果表明,M1有机肥显著增加油菜的生物量,但在一定程度上增加土壤盐分含量;M2有机肥的效果与M1有机肥效果趋势相似,但增加土壤中的盐分含量的程度要小的多;而施用秸秆肥料M3,在增加油菜生物量的同时显著降低土壤盐分含量,减轻了土壤的次生盐渍化程度。结果表明,三种秸秆有机肥均能提高油菜对盐渍化的耐受能力,增加其生物量。采用M3秸秆有机肥改良土壤盐渍化是一条有效途径,但其最佳施用量与土壤盐渍化程度有关,非盐渍化土壤施用过多M3肥料将降低生物量。

EC value, NO_3^- concentration and rape biomass were investigated in salinity soil applied with three straw manures by pot culture. The result showed that it could increase soil salt when decomposed straw was applied furthermore it ould also increase rape yield. The effect of applying partly decomposed straw was equal to applying decomposed straw. while applying straw ould increase rape yield and decrease soil salt, it ould meliorate secondary salinity and enhanced soil quality.But the optimal dosage was relevant with the status of soil salinity.