玉米抽样调查中三要素测定方法初探王耀文在粮食产量抽样调查中，三要素（即亩穗数、穗粒数、千粒重）推算是实割实测推算方法的重要参考数据。多年来，各区、县三要素数据的取样测定方法大多是大样本中取小样本。但这种方法却存在一定的弊病，而且工作量较大。昌平县在近... Preliminary Study on Determination of Three Factors in Corn Sampling Survey WANG Yao-wen In the sample survey of grain yield, the calculation of the three elements (ie, the number of ears per spike, the number of grains per spike and the weight of one thousand) is an important reference data for the actual cutting calculation method. Over the years, the sampling methods for determining the three elements of districts and counties have mostly taken small samples from large samples. However, this method has some drawbacks, but also a heavy workload. Changping County in the near ...