A.營(yíng)養(yǎng)體徒長(zhǎng) B.抗性下降 C.不易倒伏,成熟期不延遲
A.針對(duì)性強(qiáng) B.施用量大 C.在經(jīng)濟(jì)作物應(yīng)用較多
A.光合產(chǎn)物 B.生物產(chǎn)量 C.經(jīng)濟(jì)產(chǎn)量 D.經(jīng)濟(jì)系數(shù)