确定植株叶片营养诊断系统中标准值的数学模型

A Model for Determining the Norms of Foliar Nutrient Diagnosis

假定植株叶片养分含量比值与其对应的标准值的欧氏距离与植株生物量或产量之间存在线性关系，由此数学模型可估计植株叶片养分含量比值的标准值。根据模型估计的标准值建立了诊断植株养分平衡状况的方法（称为改进的DRIS法），由此方法诊断结果与DRIS诊断结果基本吻合。

Assumed the linear relationship between the plant dry matter and the Euclidean distance which is defined as the distance between the foliar nutrient concentration ratios and their norms, a mathe matical model had been proposed to estimate these norms. In order to test the accurate of the norms esti mated by the models, a modidied DRlS method is suggested to diagnose nutrient status of the plants with data of chemical analysis of leaf materials. The results from the modified DRIS(m-DRIS) are reasonable when it is used to diagnose the nutriet status, since they are coincident with those from DRIS.