连续 8年在黑龙江省 5个生态区 9个 9区固定轮作场圃综合试验 ,试验区专项研究 ,框区、盆栽试验 ,实验室分析 ,以及大量的大面积生产调查 ,发现大豆重迎茬种植 ,根际土壤养分虽然在理论计算时 ,会出现氮素营养亏缺 ,但是生产实际中 ,由于施肥的缘故 ,大豆重迎茬并没有造成养分的明显偏耗 ,不仅氮磷钾三元素如此 ,硼、钼、锰、锌等微量元素也是不同轮作方式间没有明显的差异 ;在不施肥的盆栽条件下 ,大豆以及玉米、小麦重茬种植都比正茬轮作多消耗了土壤中的主要营养元素 ,其中重茬大豆对全磷和速效钾的消耗高于重茬玉米、重茬小麦 ;大豆重迎茬种植 ,植株对营养的吸收能力发生了变化 ,对于大多数营养元素、特别是对于氮磷钾三要素的吸收能力下降 ,但是 ,对于钙、镁、铁等微量元素的吸收量增加 ;增施钾肥能显著地提高重迎茬大豆的产量。这一切都说明根际土壤养分的变化以及根对养分吸收能力减弱对重迎茬大豆的生长发育和产量有一定的影响 ,但并不是大豆重迎茬减产的主要原因。 For eight consecutive years in Heilongjiang Province, five ecological zones 9 9 zone fixed wheel field test, special experimental area, box area, potted plants, laboratory analysis, and a large number of large-scale production survey found that heavy crop replanting planting Although the rhizosphere soil nutrients in the theoretical calculation, there will be nitrogen nutrition deficit, but the actual production, due to fertilization reasons, the soybean replanting did not cause significant nutrient consumption, not only the three elements of nitrogen, phosphorus and potassium, There was no obvious difference between the different cropping patterns of trace elements such as boron, molybdenum, manganese and zinc. Under the condition of no fertilizing pots, the main nutrients in soils were consumed by soybean, corn, Among them, the consumption of total phosphorus and available potassium by stubble soybean was higher than those of re-stubble corn and corn stubble. When soybean was replanted by stubble, the ability of plant to absorb nutrients changed. For most of the nutrients, especially for the three elements of NPK However, the absorption of trace elements such as calcium, magnesium and iron increased. The increase of potassium fertilizer could significantly increase the yield of re-stubble soybean. All of this shows that changes in rhizosphere soil nutrients and root nutrients on the weakening of the capacity of heavy-cropping soybean growth and yield have a certain impact, but not the main reason for heavy cropping soybean yield.