以饲草2号为试验材料，设6.0、6.75、7.5万株/hm2共3个种植密度，于拔节期喷施多效唑、饱玉、矮跺垛3种不同类型化控剂，以喷施清水为对照，探究化控在不同种植密度下对青贮玉米生长特性和产量的影响。结果表明，随密度增加，青贮玉米收获鲜生物产量和干物质产量呈增加趋势，吐丝期株高和叶面积指数明显增加，对穗位高和吐丝期叶片SPAD值影响较小。与清水对照相比，3种化控剂喷施显著提高大口期和吐丝期叶片SPAD值，平均增加了0.5～3.5%和1.8～3.0%；株高和穗位高在多效唑喷施后明显增加，但饱玉、矮跺垛喷施后则明显降低穗位高，株高增幅较小；叶面积系数在多效唑喷施后提高了3.0%，但在饱玉、矮跺垛喷施后则下降了4.9%和8.5%。因此，不同化控剂喷施对青贮玉米植株形态特征的调控差异性导致了产量响应不一致，多效唑喷施后鲜物质产量和干物质产量较对照增加了2.2%和3.1%，饱玉、矮跺垛喷施后则分别较对照减少了3.7%和3.8%、 6.0%和5.7%。在7.5万株/hm2种植密度下，喷施多效唑后青贮玉米收获鲜生物产量和干物质产量最高，分别达82 877kg /hm2和26 1892 877kg /hm2。
英文摘要:
In order to explore the effects of different types of chemical regulators on plant growth and yield of silage corn under different planting densities, a filed experiment was conducted using Sicao No. 2 of silage corn with 3 types of chemical regulators under planting densities of 60000, 67500 and 75000 plants/hm2. The results showed that the increased planting density significantly increased fresh matter yield and dry matter production, plant height and leaf area index at silking stage, while the ear height of plant and leaf SPAD value was not effected. The three chemical control agent improved leaf SPAD value at both the bell stage and the silking stage, with an increase by.5～3.5% and 1.8～3.0% than that of the CK(water-treatment) respectively. The plant height and ear height with sparing chemical regulator“Duoxiaozuo”increased, while the ear height decreased under the chemical regulator of“Baoyu”and”Aiduoduo”. The leaf index at silking stage of “Duoxiaozuo”chemical regulator treatment increased by 3.0% s than that of the CK, while decreased by 4.9% and 8.5% for “Baoyu”and”Aiduoduo”. The fresh matter weight and dry matter production of silage corn with spraying“Duoxiaozuo”chemical regulator treatment increased by 2.2% and 3.1% that that of the CK, but decreased by 3.7% and 3.8%, 6.0% and 5.7% with spraying“Baoyu”and“Aiduoduo”treatments respectively. Under the planting density of 75000 plant/ /hm2, the treatment of chemical regulation of “Duoxiaozuo”could make the fresh matter weight and dry matter production of silage corn reach 82 877kg /hm2 and 26 1892 877kg /hm2 respectively.
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