A.覆土過(guò)厚 B.栽植過(guò)深 C.假植時(shí)間過(guò)長(zhǎng) D.栽植過(guò)于倉(cāng)促
A.1倍 B.3/2倍 C.2/3倍 D.1/2倍
A.4~5倍 B.6~8倍 C.8~10倍 D.越大越好