不同种植密度对青贮玉米产量和营养价值的影响

Effects of different planting densities on yield and nutritive value of silage corn

本文通过设置4个密度组,分别是4.65×10~4、5.50×10~4、6.35×10~4、7.20×10~4株/hm^2,探明不同种植密度对青贮玉米农大108的产量及营养价值的影响,结果表明:高密度种植会增加青贮玉米的生育期、穗位高,降低青贮玉米的株高、茎粗、叶子数和单株叶面积;青贮玉米籽粒产量、鲜物质产量和干物质产量会随着种植密度的增加而提高,但籽粒产量在高密度种植下会降低,鲜物质和干物质产量增速会减缓;粗蛋白质含量会随着种植密度的增加而减小,粗脂肪含量随种植密度的增加而提高,酸性洗涤纤维和中性洗涤纤维随种植密度的增加先增加后减少,但对中性洗涤纤维含量的影响大于对酸性洗涤纤维的影响,通过产量及营养品质等各方面比较,在本试验中,农大108最适宜的种植为6.35×10~4株/hm^2。

In order to explore the effects of different planting densities on the yield and nutritional value of silage corn Nongda 108,this paper set up four density groups of 4.65×10^4,5.50×10^4,6.35×10^4,7.20×10^4 plants/hm^2. The results showed that high density planting increased the growth period and ear height of silage corn,reduced the plant height,stem diameter,number of leaves and leaf area per plant of silage corn;Silage corn grain yield,fresh matter yield and dry matter production increased with the increase of planting density,but the grain yield decreased under high density planting,and the growth rate of production of fresh matter and dry matter slowed down;crude protein content decreased with increasing planting density,crude fat content increases with planting density. Acidic detergent fi ber and neutral detergent fi ber increased fi rst and then decreased as planting density increases,but the effect on the neutral detergent fi ber content was greater than the acid detergent fi ber.Through comparison of yield,nutritional quality and other aspects,in this experiment,the most suitable planting of Nongda 108 was 6.35×10^4 plants/hm^2.