一、绪言用不同方法能够实现对作物产量的估算,这些方法取决于作物生长情况和计算条件。确定平均产量的一种比较常用方法是测定指定作物总产量,和除以该作物总面积。但是,这种方法不适用于测定与引起灾害可变因素有关的变化产量,换言之,问题不是用实际产量减去正常产量的方法来评价作物 I. INTRODUCTION Estimates of crop yields can be made in different ways, depending on crop growth and calculation conditions. A common method of determining the average yield is to determine the total crop yield for a given crop and divide it by the total area of ​​the crop. However, this method is not suitable for measuring the changes in production associated with the variables that cause disasters. In other words, the problem is not to evaluate crops with the actual yield minus the normal yield