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为了充分利用作物密度试验的信息,对合理密植、经济高产提供严密的数量化推理原则,国内外学者先后提出了十数种描述产量与密度的关系的数学模式,众说纷纭.我认为,判断这类方程的价值应从三方面来看:(1)有理——能反映产量随密度变化的整体规律;(2)精确——能使产量y与密度x的相关比R_(y·x)尽可能接近1,即产量的理论值尽量符合实际值;(3)通用——能描述尽可能多的作物,不在判断类型上费力.按第一点,可把各种模式分为两类.一类属于经验模式,往往都存在无理现象,
In order to make full use of the information of crop density test and to provide rigorous quantitative reasoning principles of close planting density and high economic yield, scholars at home and abroad have put forward ten mathematical models to describe the relationship between yield and density. There are different opinions. The value of the equation should be viewed in three ways: (1) Rational - the general law that reflects the change in production as a function of density; (2) accurate - enables the correlation of yield y to density x, R yx, to be as close as possible 1, that is, the theoretical value of production is as realistic as possible; (3) Generic - can describe as many crops as possible, not on the type of judgment. According to the first point, the various modes can be divided into two categories: Experience patterns, there are often unreasonable phenomenon,