为探求华北地区影响大面积夏茬作物—夏玉米产量的秋季低温灾害的农业气象预报方法,第一步我们利用分期播种的田间试验进行观测,以确定秋季对夏玉米籽粒正常灌浆的下限温度指标和制定出夏玉米发育期的预测方法—这是整个秋季低温灾害预报的重要组成部分。下面是这部分内容的扼要总结。 In order to explore agricultural meteorological forecasting methods of autumn low temperature disasters in summer in North China, the first step is to observe the minimum temperature index of normal filling of summer maize grains in autumn by field experiment. And to develop a method of forecasting the development of summer maize - an important part of forecasting low temperature disasters throughout the fall. The following is a concise summary of this section.