Influence of nitrogen application on soil nutrients and yields of various vegetables grown after wheat harvest
[Objective]This study investigates the influence of nitrogen application rates on soil charac-teristics and vegetable yields under various vegetable cropping patterns subsequent to wheat cultivation,aiming to provide a theoretical basis for the rational and efficient use of nitrogen fertilizer in the Ningxia irri-gation area post-wheat.[Method]The experiment utilized wheat followed by multiple cropping of baby cab-bage(Xiaoyiheqiu),pepper(Jiaolong 7),and radish(Xinlimei).A split-plot design was implemented,with the main plots consisting of three types of multiple cropped vegetables:baby cabbage(A),pepper(B),and radish(C).Subplots featured four nitrogen application levels:0 kg/hm²(N1),180 kg/hm²(N2),225 kg/hm²(N3),and 270 kg/hm²(N4).The impacts of different nitrogen application rates on soil nutrients and vegetable yields under these cropping patterns were assessed through measurements of crop growth and soil indices.[Result]Results indicated that an appropriate amount of nitrogen fertilizer significantly enhanced the con-tent of soil available nitrogen,available phosphorus,and organic matter,with the N3 treatment showing markedly higher levels than other treatments(P<0.05).Available potassium,water content,and bulk den-sity decreased with increasing nitrogen application rates.The influence of multiple cropping patterns on soil nutrients followed the order:baby cabbage>radish>pepper.Vegetable yields under multiple cropping showed variation with nitrogen application rates.Pepper and radish yields exhibited a parabolic response to nitrogen application rate increases,with peak yields under the N3 treatment at 1 095.19 kg/667 m² and 9 006.24 kg/667 m²,respectively,surpassing other treatments by 71.64%to 199.44%and 21.22%to 143.97%,respectively.Baby cabbage yields increased with nitrogen application rates,peaking at 8,205.60 kg/667 m² under the N4 treatment,which was significantly higher than other treatments by 39.03%to 314.89%.[Conclusion]An appropriate nitrogen application rate can effectively improve soil properties,promote nutrient cycling,and enhance vegetable yields.The optimal nitrogen application rate for post-wheat multiple vegetable cropping is 225 kg/hm² in the Ningxia irrigation area.
nitrogen application ratemultiple cropping after wheatvegetablessoil nutrientsyield
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维普
