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黑龙江省北部高寒区,大豆种植重迎茬问题较严重,减产幅度随着重茬年限增加而增大。我们通过多年的试验示范和调查,详细地分析了大豆重迎茬减产原因,摸索了一套综合防治的技术。1大豆重迎茬减产的主要原因1.1养分失调,营养元素亏缺随着大豆连作年限的增加,土壤中全氮、全磷和全钾的含量变化不大,但水解氮、速效钾的含量降低,微量元素有效锌、硼含量显著减少,速效磷变幅较大。1.病虫害加重
Heilongjiang Province, northern alpine area, heavy cropping soybean planting more serious problems, reduce the rate of increase with the increasing number of stubble and increase. Through years of pilot demonstration and investigation, we have analyzed in detail the reasons for the reduction of soybean yield and found a set of comprehensive prevention and control technology. 1, the main reason for the reduction of yield of soybean replanting 1.1 nutrient imbalance, nutrient deficit With the increase of soybean continuous cropping, soil total nitrogen, total phosphorus and total potassium content changes little, but the hydrolysis of nitrogen, potassium content decreased , Trace elements available zinc, boron content decreased significantly, available phosphorus amplitude larger. 1. pests and diseases increase