Effects of Irrigation Amount and Nitrogen Application Rate on Physiological Characteristics and Yield of Silage Corn——Take Zhaotong as an Example
Silage corn has high nutritional value,and the effects of irrigation amount and nitrogen application rate on its yield and quality were crucial.The purpose of this study was to compare the impacts of different irrigation amounts and nitrogen application rates on the physiological properties,starch content,and dry matter yield of silage corn at different growth stages.A pot experiment was conducted with three irrigation levels(W1:1200 m3 hm-2;W2:1800 m3 hm-2;W3:2400 m3 hm-2),three nitrogen application rates(N1:200 kg hm-2;N2:350 kg hm-2;N3:500 kg hm-2),and three growth stages(A:big trumpet stage;B:milk stage;C:dough stage).The results showed that with the increase in irrigation amount and nitrogen application rate,the MDA content exhibited a"u"shaped trend,while the POD activity showed an"n"shaped trend.The starch content of W2 was significantly higher than that of W1 and W3(P＜0.05),while nitrogen application had no significant effect on starch content of silage corn.Compared to W1 and W2,the dry matter yield of W3 increased by 11.7％and 21.2％,respectively.Compared to N3,the dry matter yield of N1 and N2 increased by 21.8％and 7.28％,respectively.Considering both yield and starch content,N3 and W3 were recommended.
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