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小麦单位面积产量是由每亩穗数(万),每穗粒数(粒)和千粒重(克)三个因素决定的。一般用下面式子表示: 每亩产量=(穗数×粒数×千粒重)/(1000×500) =穗数×粒数×千粒重×0.02 ……(1) 把产量三因素的单位名称去掉,取其有效数值,叫做穗值、粒值、重值。把三值中其中任何两值基本不变或变化不大时,其第三值增减一个单位所引起每亩产量增减的斤数,分别叫穗值产价、粒值产价和重值产价。三值的产价公式:
The yield per unit area of wheat is determined by three factors: the number of spikes per mu (million), the number of grains per panicle (grain) and the weight of one thousand kernels (g). Generally expressed by the following formula: Per acre yield = (spike × number × 1000 grain weight) / (1000 × 500) × spike × grain × 1000 grain weight × 0.02 ...... (1) the output of three factors to remove the unit name, Take its effective value, called the spike value, grain value, weight value. When any two values in the three values are basically the same or change little, the third value increases or decreases by one unit, the increase or decrease of the yield per mu, which is called the output value of the spike, the output value of the grain value and the weight value Production price. Three-value production price formula: