不同大小整薯播种的产量变异规律及其经济效益——马铃薯整薯播种研究之二

1980～1982年,通过田间试验,对马铃薯不同大小整薯播种的产量变异规律及其经济效益进行了研究。结果表明,生产单位块薯产量所需种薯数量与种薯大小呈极显著的线性关系;马铃薯产量与种薯大小呈渐近状曲线相关;净产量与种薯大小呈抛物线性曲线相关。求得其极大值,3年平均为50.4±3.5克。马铃薯繁殖倍数与种薯大小两者的关系具有双曲线的性质,它在第一象限随种薯大小的增大而递次降低。不同大小种薯所产块茎的商品率3年平均,以111.2克为准时,种薯大小为10,30,50,80和150克,各处理所产块茎商品率依次为88.1,77.6,69.7,62.8和48.7％,以50克为准时,各处理所产块茎商品率依次为99.2,98.4,97.6,96.9和94.0％,都在90％以上。

STUDIES ON WHOLE POTATO SEEDS——Ⅱ. THE VARIATION PATIERNS OF THE PROGENY TUBER YIELD OF DIFFERENT SIZE SEED TUBERS

Field experiments were carried out in researching the variation patterns of the progeny tuber yield of different size seed tubers during 1980～1982. The results obstained were summarized as follows. The relationship between tuber yield(C, ton/ha) and seed tuber size or the amount of seed tuber/ha (Z, ton/ha) was C=z/b+aZ, in which a and b are both constants. The relationship between net yield (C-Z, ton/ha) and seed tuber size (Z, ton/ha) can be expressed as following equation C-Z=(aZ-az~2)·(1/b+az) with the maximum of 50.4+3.5g in three year average, in which 2, a and b are constants. The rate of marketable tubers decreased with the increase of seed tuber size.