根据作物密度试验和生产实践的大量资料,分析了作物密度和产量的关系,提出非效应密度、效应密度、非效应产量、效应产量、临界密度和临界产量等新概念.总结出作物效应产量定律:(1)作物的个体效应产量随效应密度递增而递减；(2)以临界密度为转折点,作物的群体效应产量随效应密度递增而先递增后递减；(3)在一定的范围内,作物的群体临界产量随临界密度递增而递增.它们对于确定作物适宜密度,增加产量具有指导的意义.%According to a vest amount data of crop density experiment and productive practice the relationship of crop density with yield was analyzed. The new concepts as noneffective density, effective density, noneffective yield, effective yield, critical density and critical yield etc. were put forward in this paper. Then we summed up the laws of crop effective yield as follow: (l)The individual effective yield of crop progressively decrease as the effective density progressively increase. (2)Taking the critical density as turning point the population effective yield of crop progressively increase first and progressively decrease afterward as the effective density progressively increase. (3)Within a certain scope the population critical yield of crop progressively increase as the critical density progressively increase. They have guiding significance to delimit adaptive density and to increase yield of crop.
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