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在良好栽培条件下,玉米品种的产量水平在公顷4.5万株稀植时,主要是由配合力决定的,而在公顷6.0万株密植时耐密性又成为主要影响因素.耐密性是一个综合性状.耐密性强(或耐密型)玉米,是以较高配合力为前提的,不仅株型紧凑、而且还具有秆强、根系发达、结实性好、易抓苗、植株整齐度高等特点.耐密型玉米适于密植的根本原因是耐密性强.公顷11000～12000kg 高产群体,由于品种的繁茂程度、光合效率以及经济系数有差异,其主要数量指标为总光合势316.4～439.2万m~2·日/ha,最大叶面积系数4.25～5.53,净同化率5.76～7.55g/m~2·日,经济系数0.496～0.549.籽粒灌浆初期穗位处由间透光率22.8%～25.6%,近地面处8%～10%.
Under good cultivation conditions, the yield level of maize varieties is mainly determined by the combining ability when the 45,000 hectares are planted sparsely, while the tightness is the main factor when the planting density is 60,000 hectares. Comprehensive character. High density (or dense) corn, is based on the higher combining ability as a prerequisite, not only the compact plant type, but also has strong stalks, developed root system, good seed, easy grasping seedlings, plant uniformity The main reason for density dense planting dense tolerance is dense.He 11000 ~ 12000kg high-yielding population, due to the variety of lush, photosynthetic efficiency and economic coefficients are different, the main quantitative indicators for the total photosynthetic potential of 316.4 ~ The average leaf area index was 4.25 ~ 5.53, the net assimilation rate was 5.76 ~ 7.55g / m ~ 2 · day, and the economic coefficient was 0.496 ~ 0.549. % ~ 25.6%, near the surface at 8% ~ 10%.