Study On Production Characteristics And Nutritive Quality Of Silage Maize

Ecological adaptability of different silage maize and the effects of plant density, N and P amount to silage yield, crude fat, crude protein and corn yield in this paper, the results are showed in the following:Plant length, spike position, total leaves, leaf of spike and mature time leaf areas of different silage maize are significantly different. In same growing stage, leaf areas index of Keshi 1 is higher than Donglingbai, Nongda 647, Huanong 1 and Zhongbei 410 significantly, and much higher than Jinkun 9. Net assimilation rate of different silage maize are significantly different.With harvest time postponing of different silage maize, plant crude protein content and crude fiber content decreased, crude ash and non-nitrogen exudation increased, crude fat showed no obvious regulation, and their accumulation showed positive correlation with dry matter production.Nutrient distribution in organs was different with different cultivars and harvest times, Crude protein contents in flowering stage were leaf>stem vagina and spike, in maturing stage were spike>leaf>stem vagina. Crude fat contents in different maturing stage were leaf>spike>stem vagina. With harvest time postponing, crude fiber contents deceased in leaf and stem vagina and increased inspike.Contents and accumulation of digested nutrition, total energy, digested energy, metabolize energy in different silage maize increased with harvest time postponing. The contents and accumulation were different with cultivars, the digest nutrition and energy of Donglingbai, Huanong 1 and Zhongbei 410 were higher, while their contents were lower. The digest nutrition and energy of Keshi 1 and Jinkun 9 were lower, while their contents were higher.The effects of N to fresh silage and dry silage were much higher than plant density and P from single-factor analysis. And from two-factor analysis, the effect to dry silage was different with harvest times: N-Density>P-Density>N-P in 30th July, N-P>N-Density>P-Density in 11th August, N-P> P-Density>N-Density in 26th August, N-Density>N-P >P-Density in 12th September. The results showed that effects of N to dry silage were much higher than plant density and P, so keep N application and adjust density and P use can improve silage yield significantly.The effects of N and P to crude protein were much higher than plant density from single-factor analysis, N>Density>P in harvest before grouting and P>N>Density in harvest after maturing. And from two-factor analysis, the effect was different with harvest times: N-P >N-Density>P-Density in harvest before grouting, P-Density>N-Density>N-P in harvest after maturing. The effects of N, P and plant density to crude protein were great, while N > Density>P and N-P> P-Density>N-Density in different harvest times.Crude fat increased with the increasing of N use, and harvest time had great effect to crude fat yield. Density had much effect when harvest in pollen-falloff stage and maturing stage, P had much effect when harvest in grouting stage. N and P interactive effect was higher when harvest in pollen-falloff stage and grouting stage, N and Density interactive effect was higher when harvest in maturing stage. In different harvest times, the single effects of N and P were showed in single peakcurves. Density had less effect to crude fat when harvest in pollen-falloff stage, when harvest after grouting stage, the crude fat yield decreased significantly with density increasing.