Effect of winter rapeseed returning as green manure in saline alkali soil on soil physicochemical properties and peanut yield
To improve saline-alkali land and peanut high yield,impact of winter rapeseed green manure on physicochemical properties of peanut soil in saline-alkali areas was explored.Field experiments were conducted over 3 years in the Yellow River Delta saline-alkali land,effects of winter rapeseed green manure were investigated at different stages on soil structures and features,including bulk density,porosity,aggregate size distribution,and water stability,pH,available nutrients,organic matter,and salt content in the peanut root zone during the pod set-ting stage.3 treatments were designed,namely fallow land without winter rapeseed planting,green manure during peanut budding,and green manure during flowering stage.Results demonstrated that the rapeseed manure at differ-ent stages significantly reduced soil bulk density of 0-20 cm and 20-40 cm layer.The numbers of soil aggregates with particle sizes＞2 mm,1-2 mm,and 0.5-1 mm were increased significantly in 0-20 cm layer.Soil micro aggre-gates with particle sizes＜0.25 mm were decreased significantly,which led to enhanced water stability of soil ag-gregates.The green manure significantly increased organic matter,alkaline hydrolyzable nitrogen,available phos-phorus,and available potassium in the 2 layers,with average increase of 10.47%-15.80%compared to control;sig-nificantly reduced soil salinity,with average decrease of 20.76%compared to control.No significant difference in soil pH was found.Overall effects were observed in the 0-20 cm layer.Peanut yields increased by 22.48%and 29.41%,respectively under manure treatments at budding and flowering stages although their differences were not significant.A significantly positively correlation was found between available nutrients and＞2 mm soil aggregates.Significantly negatively correlations were found between bulk density and＞2 mm soil aggregates,salt content and＞2 mm soil aggregates,bulk density and＜0.25 mm soil aggregates,available nutrients and＜0.25 mm soil aggregates.Therefore,winter rapeseed green manure might improve soil properties and thus promote peanut yield by enhancing saline-alkali land soil,increasing available nutrients,and reducing soluble salt content.
winter rapeseed green manurepeanutsaline alkali landsoil physical and chemical proper-tiesyield
国家科技期刊平台
NSTL
万方数据
