黑龙江省是我国大豆主产区，年平均种植面积在3500万亩至4500万亩之间，其中重迎茬种植面积占大豆面积的三分之一至二分之一，由于茬口难以调换，大豆重迎茬十分严重，给大豆生产造成很大损失，根据重迎茬减产的主要原因，我们先后研制出大豆重迎茬保产剂、增效剂、专用剂及黄? Heilongjiang Province is the main producing area of ​​soybean in China, with an average annual planting area of ​​35 million mu to 45 million mu, of which the area under heavy-crop planting accounts for one-third to one-half of the area of ​​soybean. Due to the difficulty of crop rotation, Heavy grazing is very serious, causing great losses to the production of soybean. According to the main reasons for the reduction of output, we have successively developed the soybean-growing and preserving agents, synergists, special agents and yellow?