进行控制排水、自由排水及差异施氮对照试验,观测棉花各生育阶段生长指标和产量,用通径法分析得出影响棉花产量的主要因素是结铃数,其次是单铃重。无论施氮多少,自由排水和控制水位为80 cm处理结铃数较控制水位30 cm和50 cm处理的数量多,且控制水位为80 cm的处理结铃总数最多。控制水位80 cm的处理产量最高,其次是自由排水处理,控制水位为30 cm和50 cm的处理产量较低。施氮水平对棉花产量的影响不及控制排水措施明显;排水充分(控制水位为80 cm处理)但又不过度排水(自由排水),有利于增加棉花产量。
Abstract
Comparative experiments of controlled drainage, conventional drainage and different nitrogen applications were conducted, and cotton growth indexes were measured. Path analysis was used to analyze the influencing factors of cotton yield. Results showed that the main factor was the number of the boll, followed by individual boll weight. No matter how much nitrogen was used, the number of the boll in both conventional drainage treatment and 80cm controlled drainage treatment (with controlled water level of 80cm underground) was larger than that in 30cm and 50cm controlled drainage, and was the largest in 80cm controlled drainage. The yield sorted by size was 80cm controlled drainage> conventional drainage> 30cm and 50cm controlled drainage. The effect of nitrogen application on yield was smaller than that of controlled drainage. Well-drained(80cm controlled drainage) but not overdrained treatment(conventional drainage treatment) could be more favorable to improve cotton yield.
关键词
生长指标 /
通径分析 /
控制排水 /
施氮量 /
产量
Key words
growth indexes /
path analysis /
controlled drainage /
nitrogen application /
yield
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基金
“十一五”国家科技支撑计划项目(2006BAD11B06);“十二五”国家科技支撑计划项目(2012BAD08B03)
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