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在黑龙江省５ 个生态区设置固定轮作场圃并对相应市县进行生产调查，经过连续三年的研究，结果表明，重迎茬大豆均较正茬大豆减产，减产幅度随着重茬年限的增加而增大，全省平均正茬产量为１ ９８４．５ｋｇ／ｈｍ ２，迎茬减产６．１％ ，重茬一年减产９．９％ 、重茬二年减产１３．８％ 、重茬三年减产１９．０％ 。不同生态区间比较，西部风沙干旱区、中西部盐碱土区减产幅度较大，东部低湿区、北部高寒区减产幅度较小。
In the five ecotopes of Heilongjiang Province, fixed-cycle farmlands were set up and production surveys were conducted in the corresponding cities and counties. After three consecutive years of research, the results showed that the yield of severely weakened soybean was lower than that of the continuous cropped soybean, While the average output of the province is 1 984.5kg / hm 2, curtailment of curtailment by 6.1%, curtailment of 9.9% in one year, curtailment of 13.8% .0%. Compared with different ecological ranges, the reduction of output in saline-alkali soil in the western arid and arid areas in the west and central China is larger, and the reduction in the low-humidity areas in the east and the alpine areas in the north is smaller.