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本文通过1985、1986两年对哈尔滨市新春乡39亩地春季大棚黄瓜实际产量资料的分析,推导出哈尔滨地区春季大棚黄瓜计算前期产量的理论日期为该年度理论产值正态曲线峰值出现的日期,其公式为:1.理论公式:x=1/b 1n a/(b+1nBb)/b-1nB式中,x——计算前期产量的理论日期;a、b——Logistic生长曲线公式中的经验常数,B——指数曲线方程 y=AB~x 中的常数。从始收日到 x 日产量的累积值为前期产量。2.实用公式:x=t-4式中,x——计算前期产量的理论日期;t——累积产量达总产量二分之一时的日期;4——常数。从始收日到 x 日产量累积值为前期产量。
Based on the analysis of actual production data of spring cucumber in 39 mu of spring land in Harbin in 1985 and 1986, the theoretical date of the yield of cucumber in spring of greenhouse in Harbin was deduced to be the date of the peak value of the theoretical curve of the year. The formula is: 1. The theoretical formula: x = 1 / b 1n a / (b + 1nBb) / b-1nB Where x - the theoretical date of the calculation of the previous production; a, b - Logistic growth curve formula Empirical constant, B - exponential curve equation y = constant in AB ~ x. The cumulative value of production from the date of initial harvest to the date of x is the previous production. 2. Practical formula: x = t-4 where x - the theoretical date of the calculation of the previous production; t - the date when the cumulative production reached half of the total production; and 4 - the constant. From the beginning to the date of production on the x value of the cumulative output for the previous production.