香椿苗氮素营养的研究  

STUDY ON NITRIGN NUTR IENT OF TOONA SINENSIS SEEDLINGS

作　　者：左永忠[1] 张淑莲[1] 李海军 

机构地区：[1]河北林学院,涿州市第一苗圃场

出　　处：《河北林学院学报》1994年第1期17-23,共7页

摘　　要：试验结果表明，香椿苗对氮素敏感，合理施用氮肥促进苗木磷、氮元素吸收，生长期间叶片含磷量≥０．１４％，含氮量≥４．ｏ％．该试验地条件下，在施Ｐ２Ｏ５１３０ｋｇ·ｈｍ－２基础上，氮肥施用量与造林合格苗产量呈二次抛物线关系，回归方程为ｙ＝３０３１０．６＋５４６．８９ｘ－ｌ．０３９ｘ３，适宜施氮量范围为１８０～２７０ｋｇ·ｈｍ－２，最佳经济施氮量为２６１．３５ｋｇ·ｈｍ－２．试验还对施肥后的土壤养分变化情况进行了研究。The experiment showed that the Toona sinensis seedlings reacted readily tonetrogenous fertilizers. Reasonable fertilzations promoted the absorptions of N, P of seed-lings. In growing season, the P content in leaves was more than 0. 1 4% and N more than4.0%. Under the condition of the experiment, the relationship between appication amount ofnitrogen and the qualified seedlings was of quadratic parabola equation. The equation wasy=30310.6+546.89x-1.039x2. So reasonable amount of N applied was 180～270kg/ ha, andmaximum economic amount of it was 261.15kg/ ha.Meanwhile, studies were given to thechanges of soil nutrients after fertilizer application.

关 键 词：香椿苗 营养元素含量 土壤养分 

分 类 号：S644.406[农业科学—蔬菜学]