2.1.2 树径
由表2得知,在没有供氮时(N1),香椿苗树径生长率最少,为5.18 cm. 供氮水准较低(N2、N3、N4)时,香椿苗树径生长率小,为5.74~6.24 cm. 提升供氮水准(N5~N8)时,香椿苗树径生长发育随供氮水准的提高而提升,至N7解决时,一年生香椿苗树径生长发育较大,为8...
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