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mao bai yang zai sha di zao lin de shi fei liang ji qi pei bi
Author(s): 
Pages: 31-36
Year: Issue:  1
Journal: Journal of Beijing Forestry University

Keyword:  毛白杨沙地造林最佳施肥量最佳氮磷钾配比经济效益;
Abstract: 研究毛白杨在沙地造林施用氮磷钾的最佳施肥量及其最佳配比。4.5a的试验结果表明:最佳施肥量为450kg/hm ̄2,氮磷钾配比为氮∶磷∶钾=4∶3∶0,二者组成最佳组合的立木蓄积量为41.781m ̄3/hm ̄2,是对照的190.3%。它比其它各种处理的立木蓄积量都高,差异显著,施肥使毛白杨叶中的叶绿素和氮磷钾的含量提高,也提高了叶重和叶面积等指标。因而加速了毛白杨的生长量。但施肥量过大反而抑制了毛白杨生长。氮∶磷的比值以1.33为宜。该土含钾多不施钾肥。毛白杨的年生长过程,高和径各有两次速生期。毛白杨施肥的产值净增额是投入的2.79倍。
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