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1990～1991年以出苗期为指标.着重研究了单株幼苗活力对向日葵植株籽粒产量的影响.旨在改进Wade等(1988)提出的向日葵苗期估产数学模型.结果表明.向日葵单株葵盘重量与单株籽粒产量之间呈极显著的回归关系(R~2=0.97～0.99),由前者预测后者非常可靠.可作为成熟期测产的参考.在苗期根据向日葵苗情预测收获时的籽粒产量.尽管Wade等模型有效.但加入单株幼苗活力这个因素后.整个多元回归模型的可信度大为提高.原模型中的预测因子仅包括单株面积印株距变异系数时.多元回归方程的决定系数R~2为0.25;当模型中再加入单株幼苗活力指标后,R~2增加到0.44.而且,单株面积与株距变异系数之间和单株面积与单株幼苗活力之间的互作也达到显著水平.改良模型中影响单株籽粒产量的各因素间,以单株面积和单株幼苗活力最为重要.
From 1990 to 1991, taking the seedling emergence as the index, we studied the effect of individual seedling vitality on the grain yield of sunflower plants and aimed to improve the mathematic model of sunflower seedling yield estimation proposed by Wade et al. (1988) There was a very significant regression relationship between the weight and the grain yield per plant (R ~ 2 = 0.97 ~ 0.99), which was predicted by the former to be very reliable and could be used as reference for the test of maturity.At the seedling stage, Although the model of Wade et al. Is valid, the credibility of the whole multiple regression model is significantly improved by adding the factor of seedling vigor of single plant, and the predictor of the original model only includes the coefficient of variation of single plant per plant. The coefficient of determination of multiple regression equation was R ~ 2 0.25; R ~ 2 increased to 0.44 when the single seedling vigor index was added to the model. Moreover, the coefficient of variation between single plant area and plant spacing, The interaction between the vitality also reached a significant level.Effects of single plant area and single seedling vigor is most important among the factors that affect the yield per plant in the improved model.