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近年来,随着各地肥水条件的改善和栽培技术水平的不断提高,尤其是紧凑型玉米杂交种的推广应用,适当增加株数,扩大群体,是促进夏玉米高产的有效途径。玉米属于单位面积上株数较少,而单株生产力较高的作物,由于它分枝性极弱,通常每株仅在主茎上只生长一个果穗,它利用单株领域内生活条件的自动调节能力很低,一般来说,缺1株便减少二两粮食,每亩缺
In recent years, with the improvement of fertilizer and water conditions throughout the country and continuous improvement of cultivation techniques, especially the popularization and application of compact maize hybrids, the appropriate increase of the number of trees and expand the population is an effective way to promote high yield of summer maize. Maize is a plant with a small number of plants per plant and a plant with a high productivity per plant, because of its extremely weak branching, usually grows only one ear per plant on the main stem, which uses the automatic regulation of living conditions in the field of the individual The ability is very low, in general, the lack of a strain will reduce twenty-two food, acre deficient