化控剂对不同密度青贮玉米生长和产量的影响

以饲草2号为试验材料,设6.0万、6.75万、7.5万株/hm2共3个种植密度,于拔节期分别喷施多效唑、饱玉、矮跺垛3种化控剂,探究化控剂在不同种植密度下对青贮玉米生长和产量的影响。结果表明,与清水处理相比,3种化控剂均显著增加各时期叶片SPAD值。多效唑喷施明显增加株高、穗位高和叶面积系数,饱玉、矮跺垛喷施则使其降低。鲜物质产量和干物质产量在多效唑处理下较对照显著增加了2.2%和3.1%,饱玉、矮跺垛喷施后则显著减少了3.7%和3.8%、6.0%和5.7%。在7.5万株/hm2种植密度下多效唑处理获得青贮玉米最高鲜物质产量和干物质产量,分别达82 877 kg/hm2和26 189 kg/hm2。

Effect of Chemical Regulators on Plant Growth and Yield of Silage Corn under Different Planting Densities

In order to explore the effects of different chemical regulators on plant growth and yield of silage corn under different planting densities, Sicao No.2 was experimented under three types of chemical regulators with planting densities of 60 000, 67 500 and 75 000 plants/ha. The results showed that the three chemical control agent all improved leaf SPAD value at both stages. The plant height, ear height and the leaf index increased with sparing chemical regulator "Duoxiaozuo", but decreased under the chemical regulator of "Baoyu"and "Aiduoduo". The fresh matter weight and dry matter production of silage corn with spraying "Duoxiaozuo" then increased by 2.2% and 3.1% compared to the water treatment, but decreased by 3.7% and 3.8%, 6.0% and 5.7% with spraying "Baoyu"and "Aiduoduo" treatments respectively. The highest fresh matter weight and dry matter production were 82 877 kg/ha and 261 89 kg/ha after the treatment of "Duoxiaozuo" under the planting density of 75 000 plant/ha respectively.