Effects Of Sowing Density And Applying Nitrogenous Fertilizer Quantity On The Silage Yield And Quality Development Of Foodstuff Maize

It is a very important approach that yielding maize used both foodstuff and feedstuff to solve supply and requirement contradiction on foodstuff and realize effective supply about foodstuff and feedstuff in china. The photo-characteristics physiologically, forming law on yield, forming law on nutritive value in the aspect of feedstuff, and nutritive quality after silaged were studied under different density and applying nitrogenous fertilizer quantity with the material-Yayu8 used both foodstuff and feedstuff in this experiment. The studying results showed as follows:As for the matter production, fresh matter yields on the whole plant and dry matter yields on ears of maize showed the tendency of increase firstly and then decrease, and dry matter yields on the whole plant gradually increased along with the increase of density. Fresh matter yields, dry matter yields and dry matter yields on ears of maize all increased gradually along with the increase of applying nitrogenous fertilizer quantity. The yields under 337.5kg/hm~2 and 225kg/hm~2 showed extremely remarked difference. Thereinto, the fresh matter yields, dry matter yields and yields on ears of maize were the highest when applying nitrogenous fertilizer quantity was 337.5 kg/hm~2 under mid-density. As for the ratio of matter distribution, that of fresh matter showed as fresh stem vaginas>fresh ears>fresh leaves, that of dry matter showed as dry ears>dry stem vaginas>dry leaves; the weight of fresh leaves, fresh ears and fresh stems reached the highest under low, middle and high density respectively; percentage of the weight for dry leaves, dry stem vaginas and dry ears reached the highest under low and middle density respectively; percentage of the weight about fresh leaves and dry leaves showed the tendency of increase firstly and then decrease, that of fresh ears and dry stem vaginas showed the tendency of decrease firstly and then increase, and that of fresh stem vaginas decreased and dry ears increased gradually along with the increase of applying nitrogenous fertilizer quantity.The nutritive ingredients content on the whole plant raw material and its accumulation amount showed remarked difference under different density and applying nitrogenous fertilizer quantity. Content of crude protein and nitrogen free extract decrease, ant that of crude fattiness, crude fiber and crude ash increased in the whole plant along with the increase of density. Content of crude protein increased firstly ant then decreased, that of crude fattiness increased gradually, and that of crude fiber and crude ash decreased firstly and then increased in the whole plant along with the increase of applying nitrogenous fertilizer quantity. Content of nitrogen free extract decreased after applying nitrogenous fertilizer. Nutritive ingredients accumulation amounts showed remarked difference under different density and applying nitrogenous fertilizer quantity. Content of crude, nitrogenfree extract and total nutrient which could be assimilated reached the highest value when the applying nitrogenous fertilizer quantity was 337.5 kg/hm2 and 225 kg/hm2 under middle density, content of crude fattiness and crude ash enhanced in the whole plant along with the increase of density and applying nitrogenous fertilizer quantity. Increasing density could enhance the content of crude fiber, but had little effect when increasing nitrogenous fertilizer quantity. Content of crude protein, crude fattiness and nitrogen free extract were relatively high and that of crude fiber was relatively low, and yields of crude protein, nitrogen free extract and total nutrition which could be assimilated were the highest when applying nitrogenous fertilizer quantity was 337.5 kg/hm2 under middle density.Silage could enhance content of crude protein, crude fattiness, crude ash and nitrogen free extract and decrease content of crude fiber to a large extent in the raw material, accordingly enhance the nutrition value in the aspect of feedstuff. Ratio of increase on content and yield of crude protein and crude fattiness was the highest, and ratio of decrease on content and yield of crude fiber was the lowest under low density when the whole plant ensilaged. Ratio of increase on content and yield of crude protein and crude fattiness, and ratio of decrease on content and yield of crude fiber both raised firstly and then drop in the whole plant along with the increase of applying nitrogenous fertilizer quantity. Ratio of increase and yield on crude protein, crude fattiness were the highest, and yield of the other nutrition ingredients was also relatively higher when applying nitrogenous fertilizer quantity was 337.5 kg/hm2 under middle density because of the effects of nutrition ingredient content and dry matter accumulation amount.Ratio of increase on crude protein content and ratio of drop on crude fiber were the highest under low density; and ratio of increase on crude protein and crude ash content was the highest under middle density when corn silage without ears were ensilaged. Ratio of increase on crude protein content was the highest when deal with high nitrogen and applied nitrogenous fertilizer 337.5 kg/hm2; Ratio of increase on crude fattiness and crude ash was the highest when applied nitrogenous fertilizer 225 kg/hm2 > 337.5 kg/hm2 respectively; ratio of drop on crude fiber content was the highest when applied high nitrogenous fertilizer quantity and not applying nitrogenous fertilizer; and ratio of increase on nitrogen free extract content dropped firstly and then raised, and that was the highest when not applying nitrogenous fertilizer.