while availability of some mineral nitrogen is important to maximize soybean BNF and yield, applying N fertilizer to most legume crops will not increase yield and BNF.

• 尽管一定的矿质氮的供应在大豆增产和提高生物固氮方面非常重要，但施用氮肥对大多数豆类作物而言并不能增加产量和提高生物固氮。