播种密度与氮肥施用量对玉米茎秆抗倒能力的影响

以宏育236、翔玉998、加美2号为试验材料,田间设置6万、7万、8万、9万、10万株/hm2 5个种植密度和纯氮150、180、210,240、270 kg/hm2 5个氮肥施用量,研究种植密度与氮肥用量对玉米茎节干物质积累及抗压强度的影响,并与推倒强度进行相关性分析,为玉米密植抗倒机械化生产提供依据.结果表明,密度...

Effect of Planting Density and Nitrogen Application on the Lodging Resistance of Maize Stalk

Hongyu236, Xiangyu998 and Jiamei 2 were used as the materials. The rate of nitrogen(pure N) application was 150, 180, 210, 240 and 270 kg/ha. Planting density was 60 000, 70 000, 80 000, 90 000 and 100 000 plants/ha. The purpose of this research is to explore the rate of nitrogen application and density on dry matter accumulation and compressive strength of stems at the base of maize, and to analyze the correlation with the thrust strength, in order to provide a basis for the anti-inverted mechanized production of maize close planting. The results showed that, inter-node dry matter increased first and then decreased when density and nitrogen fertilizer increased, and the interaction between density and nitrogen fertilizer was positive. However, when density was more than 80 000 plants/ha, inter-node dry matter decreased irreversibly. Crushing strength decreased when density increased, and effect of nitrogen fertilizer was not significant. Besides, the 3rd to 5th inter-node dry matter per centimeter and the 3rd inter-node crushing strength could be used to evaluate lodging resistance of maize.