杂交中籼一般为当年制种下年应用,但由于年度间制种产量有一定的波动,部分单位种植面积也有变化,因而多数年份都多余数量不等的种子,有些年份陈种面积还相当大。如去年扬州市陈种面积达105万亩,占全市杂交中籼面积的47%。在目前贮存条件下,陈种表现为生活力下降,酶的活力降低,? Medium Indica hybrids are generally the year seed production, but due to fluctuations in seed production during the year, part of the unit acreage has also changed, so most of the years have extra seeds of varying amounts, in some years Chen area is still quite large . As last year, Yangzhou City, Chen species area of ​​105 mu, accounting for 47% of the city hybrid mid-indica area. Under the current storage conditions, Chen species showed decreased viability and decreased enzyme activity?