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本研究采用了3个玉米品种,5个密度处理在中等地力条件下进行密度试验。结果表明:品种和密度是影响产量的主要因素,且品种与密度的互作效应不显著。不同密度之间的产量差异达到极显著。供试品种的耐密性有一定的差异。铁单12的产量开始随密度的增加而提高,再继续增加密度,产量不再上升。在试验密度范围内,辽单35、丹玉39的产量随密度的增加而增加。通过对植株叶面积、LAI、叶绿素含量等生理指标的观测得到如下结论:随密度的增加,群体内单株叶面积降低。LAI、叶绿素含量开始随密度增加而增加,达到一定值后,随密度增加而下降,尤其在生长后期,下降趋势更加明显。
In this study, three maize varieties were used, and five densities treatments were conducted under moderate geotechnical conditions. The results showed that variety and density were the main factors affecting the yield, and the interaction between variety and density was not significant. The differences in yield between different densities are extremely significant. Species of the tightness of the test have some differences. Iron single 12 production began to increase with increasing density, and then continue to increase the density, the output does not rise. Within the experimental density range, the yield of Liao Dan 35 and Dan Yu 39 increased with the increase of density. Through the observation of physiological indexes such as leaf area, LAI, chlorophyll content, the following conclusions were drawn: With the increase of density, the leaf area of single plant decreased. LAI, chlorophyll content began to increase with increasing density, reaching a certain value, decreased with increasing density, especially in the late growth stage, the downward trend is more pronounced.