一、对边断根 大豆根系越多,吸收土壤养分的面积就越大,也就越利于增产。为此,可采取对边断根的方法,促其多发次生根。具体方法是:当幼苗长出两片对生真叶时,用利铲在离豆棵6厘米处与地面成60°角斜向切入,断其侧根和主根。在此操作过程中,应注意以下三点:①断根适当,保证切入边确实断根,另一对边又无损伤,以利返苗快和多发次生根。②切口勿大,否则易散湿造成 First, the edge of the roots cut off more roots, the greater the area to absorb soil nutrients, but also the more conducive to increase production. To this end, can take the method of cutting off the root, promote its multiple secondary roots. The specific method is: When the seedlings grow two pairs of true leaves, the use of shovel blade 6 cm away from the ground at a 60 ° angle into the oblique cut off the lateral roots and the main root. In this operation, should pay attention to the following three points: ① cut the root properly, to ensure that the cut edge is indeed cut the root, the other pair of edges and no damage, to facilitate rapid and repeated secondary seedling secondary roots. ② incision is not big, otherwise easy to get wet