宿生枝干粗度和高度对蓖麻再生苗新梢萌发的影响

研究了宿生枝干粗度和高度对蓖麻再生苗新梢萌发的影响。结果表明,宿生枝干粗度在4.1 cm以上且木质化程度较高,苗木基本能安全越冬,次年新梢萌发量大,新梢长而粗壮,叶片多,叶片大;宿生枝干高度以0～80 cm(0～20 cm最好)再生萌发能力强,新梢生长速度快,超过80 cm以后宿生枝干萌发新梢数量很少。因此,蓖麻在生长期要加强栽培管理,促进枝干生长粗壮,则越冬性能好。冬季留茬高度以低于1.0 m为宜或次年依新梢萌发情况剪干,但无论冬剪或春剪时,剪口须留斜桩,离萌芽处15～20 cm,防止剪口向下枯死影响新梢正常生长。

Influence of the Boarder Trunk's Thickness and Height on the Germination Shoots of Regenerated Seedlings in Castor-oil Plant

The influence of the boarder trunk's thickness and height on shoots germination of regenerate seedlings in castor was studied. The results showed that when boarders trunk are thicker than 4.1cm and lignified degrees in higher levels, seedlings could grow normally through winter, and sprout a large amount of new shoots with more and larger leaves whichwere long and thick next year; the regenerative sprouting ability was better when boarders trunk's height was in 0 ～ 80cm(0～20cm was the best), and new shoot sprouting fast, but there was few new shoot sprouting when boarders trunk's heightwas more than 80cm.