水稻基础产量与最高产量的分布模型及相互关系

通过对１９４个早稻和２３０个晚稻氮、磷、钾肥用量田间试验结果的分析，发现水稻基础产量（不施肥处理的产量）和最高产量（不同施肥量处理中获得的最高产量）的频次分布均符合正态分布；若将基础产量的分布按概率２５％、５０％和２５％划分为低、中、高三个区域，则相应的变幅可作为划分低、中、高产田的参考指标。经回归与相关分析表明，水稻基础产量与最高产量间呈极显著的正相关，施肥得到的最大增产量与基础产量间呈极显著的负相关；基础产量对最高产量和最大增产量变异性的影响程度分别达２５％和３０％．

Study on distribution models and the relationship between basal yield and maxmium yield of rice.

Based on the analysis of the results from 194 early rice and 230 late rice field experi- ments,it was found that the frequency distributions of basal yield and maximum yield conformedto mormal distribution model. The distuibutions of both the early and the late rice basal vields could be divided into low,middle and high intervals which occupied 25%, 50%and 25%of the total distribution,respectively. It was suggested that these intervals could be used as the critic standards for distinguishing from the low, middle or high yield soils. It was found by regression and corelation analysis that the maximum yield positively related with basal yield,and the maxi-mum increased yield from fertilization negatively corelated with the basal yield. The variations of the maximum yield and the maximum incrleased yield from fertilization were determined by basal yield with an extent of 25%and 30%, respectively.