The Effect Of Nitrogen Operation On The Silage Production And Nutritive Quality Of Maize In Silage Cultivation

Silage maize was one of the developing directions of agricultural and animal husbandry. This experiment was carried out in 2005 and 2006; the silage production and nutritive quality of 3 maize cultivars (separately were ND108, KQ1 & JK9) in 2 types were researched systematically, the goal was to provide theoretic guidance for silage maize cultivation and reasonable using. The result of this experiment indicated several points hereinafter.(1) Nitrogen operation influenced yield forming through influencing the up growth of maize. The effect of nitrogen application on the fresh matter yield and dry matter yield of the 3 cultivars were remarkable. The fresh matter accumulation present a parabola curve dynamic and the dry matter accumulation present an"S"shape curve with the growing course. The effect of different nitrogen levels on the fresh & dry matter accumulation all presented N4>N5>N3>N2>N1. In harvesting stage, we found that fertilizing in jointing, large bugle & tassel stages with the proportion of 3:6:1 had the highest fresh & dry matter yield, namely that transferring nitrogen in prophase to anaphase had the highest yield; the yield in fertilizing in jointing & large bugle stages with the proportion of 3:7 was the second; the yield in fertilizing in jointing & large bugle with 5:5 was the lowest.(2) The effect of nitrogen application on silage nutritive quality was also remarkable. The content of CP, EE, NFE and TDN increased with the increase of nitrogen application, but when nitrogen application overstepped a certain value, the contents fell instead. The accumulation amounts of CP, EE, CF, NFE, GE, DE and ME increased with the increase of nitrogen, but when nitrogen application overstepped a certain value, the accumulation amount fell instead, and all presented N4>N5>N3>N2>N1. In harvesting stage, we found that fertilizing in jointing, large bugle & tassel stages with the proportion of 3:6:1 had the highest accumulation amount, namely that transferring nitrogen in prophase to anaphase had the highest accumulation amount; the yield in fertilizing in jointing & large bugle stages with the proportion of 3:7 was the second; the yield in fertilizing in jointing & large bugle with 5:5 was the lowest.(3) The relationship of nitrogen application and silage production & silage nutritive quality could be simulated with unitary quadratic equations preferable, the optimum nitrogen application for silage maize cultivation was 337.5 kg nitrogen per ha, and applying nitrogen in jointing stage, large bugle stage and tassel stages with 3:6:1 could improve plants growth situation, increase the biomass and improve nutritive quality. So in maize silage production, nitrogen application should be increased and application stage should be delayed.