不同有机物料还田与施氮量对玉米根系特性及籽粒产量的影响OA

This study investigated the effects of different organic material incorporation methods and N application rates on root growth,root vitality,and grain yield,with the aim of providing theoretical guidance for integrated application of organic materials and N fertilizers.A field experiment was con-ducted using four organic materials treatments:no incorporation(CK),soybean straw(S),maize straw(Z),and organic fertilizer(M),combined with three N levels:no N application(N0),180 kg/hm2(N1),and 225 kg/hm2(N2).Maize aboveground biomass,root development,and grain yield were monitored,and influencing pathways were analyzed.The results showed that under all organic in-corporation treatments,root length,root surface area,and root volume in both N1 and N2 treatments initially increased and then stabilized as the growth stage progressed.Root vitality peaked in the N2 treatment under the'M'condition across all growth stages.The highest yields were recorded under N2 combined with'M'and'Z',while under'S'incorporation,N1 resulted in the highest yield.Par-tial least squares path modeling(PLSPM)indicated that nitrogen application rate had the most signifi-cant effect on grain yield across all organic treatments,followed by root structural traits(root volume and surface area).The total yield effect of the organic materials ranked as:'M'>'S'>'Z'.In conclu-sion,N2 application under'M'or'Z'incorporation is more effective in enhancing root development,vitality,and yield,while under'S'incorporation,N1 is more beneficial for these parameters.