减产年 meaning in English

off year; lean year

According to the response yield to water , five types of drought and yield reduction were defined , they are light moderate , heavy , serious heavy and ultra - heavy , and the spatio - temporal distribution of which and the correlativity between them in recent 40 years is analysed
根据产量对水分的响应，定义了五种干旱年型和减产年型，分别为轻、中、重、严重和极端严重。
The results indicated : the probability distribution of natural moisture deficiency rates of winter wheat during the growing period could be divided into three types because of their regional difference , which were mainly in the north part , the middle part and the south part respectively in producing area of northern china . in north and middle , the frequency of serious drought was higher , but in south , it was the light drought
分析了不同干旱年型和减产年型的时空分布状况及其相关关系，关系表明，干旱年型和减产年型两者没有明显的一致性，而且干旱年型发生的站次多于对应的减产年型，尤其较重的干旱年型出现较多，而较重的减产年型极少。