大豆施肥大豆虽有根瘤固氮能力，但从破土出苗到生长３０～３５天之前，根瘤尚未完全形成，并没有固氮能力，而大豆生长到２０～２５天正处于需氮素关键时期。此时期缺氮素会严重影响大豆中后期健壮生长和秋后产量的提高。在播种前，每亩用碳酸氢铵混拌农家肥刨埯每亩施６... Although soybean nodule nitrogen fixation capacity of soybean, but from the emergence of seedlings to grow 30 to 35 days ago, nodules have not yet been fully formed, and no nitrogen fixation capacity, and soybean growth to 20 to 25 days is in a critical period of nitrogen demand. Nitrogen deficiency during this period will seriously affect the robust growth of mid and late soybean and autumn yield increase. Before sowing, mix with ammonium bicarbonate per mu of peasan ...