密度及收割高度对复播青贮玉米产量和品质的影响

Effects of Density and Cutting Height on Yield and Forage Nutritive Quality of Sequential Cropping Silage Maize

以农大1027组合为材料,在大田条件下分别研究了5种密度及不同收割高度对复播青贮玉米(生长期82 d)产量和饲用品质的影响。结果表明:在密度6万～18万株/hm2范围内随着密度的增加产量先增后降,密度与产量呈二次曲线关系;而饲用营养品质却随密度增加呈现下降趋势。产量最高的密度和品质最优的密度不一致,优质时的密度显著低于高产时的密度。在密度9万～12万株/hm2条件下,可以获得产量高、品质较优的青贮玉米。适当提高收获高度可以明显改善青贮玉米的饲用营养品质。

The yield and forage quality of sequential cropping silage maize were studied at 5 densities and different harvest height in this paper, The results showed that yield increased first and reduced then with the increasing of density within （6 - 18） × 10^4 plants per ha, Yield and plant density assumed conic relation. Forage quality dropped with the increasing of density instead, The density of highest yield and the density of the most excellent quality is different. The density of the most excellent quality is small than the density of highest yield, The yield and the quality are both best under the density of （9 - 12） × 10^4 plants per ha. The improvement of harvest height suitalble can improve the forage quality of sequential cropping silage maize.