大棚春黄瓜前期产量的确定方法

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。

A METHOD FOR DETERMINING THE EARLY STAGE YIELD OF THE SPRING CUCUMBER GROWN UNDER THE SHED

The theoretical date for calculating the early stage yield of the shedspring cucumber in Harbin region was determined as the days when the peakof the normal distribution curve of the output value appeared that year,through the analysis of the data concerning the actual yield of the shed springcucumber collected from a planting area of 39 mu in Xinchun township ofHarbin city both in 1985 and 1986,and the calculating formulae obtained areas follows:1.the theoretical formula:x=(1/b)ln(a(b+lnB)/b-lnB)Where,x is the theoretical date for calculating the the early stage yield;a and b are the experience constants in the Logistic growth curve;B is the constant in the index epuation,y=AB~xIt should be pointed out that the accumulative value from the first dayof harvesting to day X constitutes the early stage yield.2.the practical formula:x=t-4Where,x is the theoretical date for calculating the early stage yield;t is the date when the accumulative output value reaches half of thetotal output;4 is a constant.And also here the accumlative value from the first day of harvesting to dayX can stand for the early stage yield.