1987年宁夏引黄灌区春小麦普遍减产。据各市县调查报告及国营农场资料汇总,减产范围之广、幅度之大,是仅次于1970年的第二个减产年份。从产量构成因素看,与丰收的1984、1986年相比,主要是产量构成三因素同时减少,这在引黄灌区小麦生产的历史上是少见的。 In 1987, the Yellow River irrigation in Ningxia generally reduced spring wheat production. According to the survey reports of all cities and counties and the compilation of information on state-owned farms, the scope of production cuts is so wide that it is the second reduction year after 1970. In terms of yield components, compared with the high-yielding years of 1984 and 1986, the three factors contributing to the reduction of production are both reduced, which is rare in the history of wheat production in the Yellow River Diversion Irrigation District.