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一、目的和意义优良品种在农业生产上的增产作用是无可置疑的。然而,一个优良品种在同一地区连续多年种植,由于机械混杂、生物学混杂等原因,随着种子代数的增加,种性会发生变异和退化,品种纯度由高变低,植株性状由优变劣,导致产量的降低。为了摸清纯度与产量之间的关系,我们在1980～1982年,搞了水稻纯度与产量关系的试验和大面积生产田调查,观察了不同纯度在产量和主要经济性状上的变化。为建立良种繁育推广体系和确定品种更新制度提供依据。
First, the purpose and significance of superior varieties in agricultural production increase yield is beyond doubt. However, a fine variety in the same area for many years of planting, due to mechanical confounding, biological hybrid and other reasons, with the increase of seed algebra, variation and degeneration will occur, the purity of varieties from high to low, plant traits from superior to inferior , Leading to lower production. In order to find out the relationship between purity and yield, in 1980 ~ 1982, we carried out experiments on the relationship between the purity of rice and yield and the investigation of large-scale production field. We observed the changes in yield and major economic traits of different purity. It provides the basis for setting up popularization and breeding system and identifying the system of breed renewal.