向日葵苗期估产改良数学模型的研究

AN IMPROVED MATHMATICAL MODEL FOR PREDICTING GRAIN YIELD AT SEEDLING STAGE IN SUNFLOWER

本文以播种至出苗天数为指标,着重研究了单株幼苗活力对向日葵籽粒产量的影响,旨在改进Wade等提出的向日葵苗期估产数学模型。结果表明,向日葵单株葵盘重与单株籽粒产量间呈极显著回归关系,由前者预测后者非常可靠。在原模型中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。由此而建立的苗期估产改良数学模型可以更有效地用于根据苗情预测向日葵籽粒产量。

Field experiment was conducted to modify the regression model of Wade et al.for prediction of grain yield at seedling stage in sunflower,by adding a term of individual plant vigour at the time of emergence.Results showed,that the accountability of the regression equation was greatly improved after this term was added to the model.The improved model proved more effective both theoretically and practically,in which grain yield per plant could be computed from head weight per plant by a linear regression equation.