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河西地区各地、不同品种的亩保苗密度变动于20—45万之间,一般不形成产量的显著差异。这是由于保苗数(x)与成穗数(Y)、穗粒数(N)间的关系分别按x/Y=A+Bx和1/N=A+Bx的规律变化,千粒重又基本上是个常数造成的。河西地区春小麦适宜保苗密度(xopt)随海拔高度(h)的升高而下降,重穗型品种的理论方程为xopt=68.57-0.02401h,其相关系数为-0.7509(显著)。一个地方的田间保苗密度变动于xopt—xopt.90％间可认为达到了适宜密度。多穗型品种尚难提出具体数量指标,但估计大量应用多穗型品种的酒泉地区自玉门到酒泉亩保苗密度自37万逐步增至45万可能是适宜的。上述保苗密度指标估计在河西地区的适应面不下400万亩,若能全面使用,年节约、增产小麦可能达到2.0亿斤,且有利于稳定产量、方便管理的效果。因此,抓紧印证、推广这一结果十分必要。
Hexi area around the different varieties of seedling density of acres of seedlings in the range of 20-450000, generally do not form a significant difference in yield. This is because the relationship between seedling number (x) and number of spike (Y) and number of spike (N) changes according to the rules of x / Y = A + Bx and 1 / N = A + Bx respectively. Is a constant result. The suitable seedling density (xopt) of spring wheat in Hexi area decreased with the increase of altitude (h). The theoretical equation of heavy panicle type was xopt = 68.57-0.02401h with a correlation coefficient of -0.7509 (significant). In one place, seedling density changes in the field of xopt-xopt.90% can be considered between the appropriate density. However, it is estimated that a large number of multi-spike varieties of Jiuquan region from Yumen to Jiuquan mu seedling density gradually increased from 370,000 to 450,000 may be appropriate. The seedling density index is estimated in Hexi area to adapt to no less than 400 acres, if fully used, the annual savings, wheat yield may reach 200 million pounds, and is conducive to the stability of production, to facilitate the management effect. Therefore, pay close attention to prove that promotion of this result is very necessary.