元谋干热河谷印楝幼林施肥效应初步研究

Preliminary Study on Fertilization Effectiveness of Azadirachta indica Young Plantation in Yuanmou Dry-hot Valley

对元谋干热河谷印楝人工幼林经22个月施肥试验,结果表明:施肥对幼林的生长有非常明显的增益效果。综合N、P、K肥各水平对幼林生长的反应,N150P150K50是印楝幼林比较优越的施肥配方,该处理的树高和地径分别是对照的1 9倍和2 7倍;施肥处理的肥效指数达到2 86～14 17,树高、胸径生长对P、N肥反应敏感;偏相关分析表明:N、P、K肥与幼林各生长性状之间都存在正相关,但只有N、P肥对幼林生长相关关系显著。

Twenty-two months' test in Yuanmou dry-hot valley showed there was high significant increase effect for Azadirachta indica young plantation's fertilization. The most effective treatment was N_(150)P_(150)K_(50) according to the growth response of N,P and K on young plantation, whose height growth increment was 1.9 times that of non-fertilizer treatment. The growth increment of basal diameter was 2.7 times that of CK. The index of fertilizing effect of these treatments reached 2.86～14.17. The growth of height, and basal diameter of Azadirachta indica young plantation were sensitive to P and N. The result of partial correlation analysis showed there existed positive correlation between young plantation's growth and N,P and K. However , only N and P had significant effect on the growth of Azadirachta indica young plantation.