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在目前生产条件下,大豆重茬种植难以避免。重茬大豆减产严重,主要原因是孢囊线虫病危害,缺乏有效防治办法。本文通过试验中发生的现象,认为重茬种豆因土壤水分不足而诱发孢囊线虫病,如果保持大豆生育期获得500～600mm水量,即可免除病害,从而保证重茬大豆不减产。从土壤水分状况来讨论了“宁重勿迎”的原因,并提出了苗期供水、原垅上株种、适期晚播、适当稀植和调整化肥N:P_2O~5结构等综合措施,以解决重茬大豆减产问题。
Under the current production conditions, soybean stubble planting is difficult to avoid. Severe crop reclamation serious, mainly due to cyst nematode hazards, the lack of effective prevention and treatment. This article through the phenomenon occurred in the experiment, that stubble beans due to insufficient soil moisture induced cyst nematode disease, if you maintain the soybean growth period of 500 ~ 600mm water, you can avoid disease, so as to ensure the continuous cropping soybean does not cut. The reason of “Ningzhongbuying” was discussed from the condition of soil moisture, and the comprehensive measures such as water supply at seedling stage, strain on the original seedlings, late sowing date, appropriate sparse planting and adjusting the structure of fertilizer N: P2O5 were put forward. To solve the problem of crop reclamation soybean yield.