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棉花棉铃脱落取决于植株生长速率和生长着的棉铃对植株同化物的需求量。设计本研究是为了检验棉铃量(BOLL)和被定义为最大铃量的携带能力(CA)之间的比值能够用来指明具有不同生长速率棉株棉铃脱落分数的假说。1987和1988年将棉花种植在温室内,以两周的间隔施氮0、18、36、72和144 mmol。1987年5个处理的最大叶面积指数(LAI)的变幅是0.6～2.2,最大棉铃量的变幅是5.3～23.1个/m~2。1988年的相应数值分别为1.2～4.2和9.1～39.5。在两年中最高氮处理的单铃重平均为4.1g。单铃重随施氮量下降而下降,但只有O氮处理小于144 mmol氮处理的80％。棉铃脱落分数取决于处理和棉铃量。不过两年棉铃脱落分数与BOLL/CA比值高度相关(R~2=0.84)。假定相关方程是斜率为1:1的直线,其估计标准误差(S.E.)为0.13。CA值与最大LAI高度相关(R~2=0.98),这表明氮亏缺的主要影响是由于降低了叶面积指数,从而减少了截光量。本分析证实BOLL/CA比值能够用来指示棉花的棉铃脱落分数,同时通过对建立在期望产量或LAI之上的CA估测,或许作为一种投入对棉花栽培管理具有参考价值。
Cotton boll shedding depends on the plant growth rate and growing cotton boll to plant assimilate demand. The purpose of this study was to test the hypothesis that the ratio between Boll Bolls (BOLL) and Carriage Capacity (CA), which is defined as the maximum boll size, can be used to indicate boll shedding scores for cotton plants with different growth rates. Cotton was planted in the greenhouse in 1987 and 1988 and 0, 18, 36, 72, and 144 mmol N were applied at two-week intervals. In 1987, the maximum leaf area index (LAI) of five treatments was 0.6-2.2, and the maximum boll amplitude was 5.3-23.1 / m 2. 39.5. The average boll weight for the highest nitrogen treatment in two years was 4.1 g. The single boll weight decreased with the decrease of nitrogen application rate, but only less than 80% of the nitrogen treatment of 144 mmol nitrogen treatment. The cotton boll shed score depends on the amount of cotton boll processing. However, the two-year cotton boll shedding fraction was highly correlated with the BOLL / CA ratio (R ~ 2 = 0.84). Assuming the correlation equation is a straight line with a slope of 1: 1, its estimated standard error (S.E.) is 0.13. The CA value is highly correlated with the maximum LAI (R ~ 2 = 0.98), indicating that the major impact of nitrogen deficiency is due to the reduced leaf area index, which in turn reduces the amount of interception. This analysis confirmed that the BOLL / CA ratio could be used to indicate boll boll shedding in cotton and may be of value as an input to cotton cultivation management through estimates of CA based on expected yield or LAI.