腐殖质赤红壤上施磷、锌和硼对巨桉苗的影响

在温室中以６个营养处理对腐殖质赤红壤上巨桉苗进行施肥试验，结果表明：苗高、地径和生物量在施肥处理与对照处理间存在着极显著差异；除单施锌（Ｚｎ）处理的根系生物量、单施硼（Ｂ）处理的茎枝生物量和根系生物量外，各处理的指标都大于对照处理的指标，并与对照有显著差异；各含磷（Ｐ）元素处理的高径比都小于对照，相反，单施Ｚｎ或Ｂ处理的高径比都大于对照；以苗高、地径、地上生物量、地下生物量和总生物量为基础，选出各施肥处理的优劣顺序为Ｐ＋Ｚｎ＞Ｐ＋Ｚｎ＋Ｂ＞Ｐ＞Ｂ＞Ｚｎ＞ＣＫ。同时，对６个处理的苗木各部分生物量间的分配关系进行了分析。

Effects of P，Zn and B Application on Eucalyptus grandis Seedlings on the Humus Lateritic Red Soil

In a glasshouse，six nutrient treatments were conducted for Eucalyptus grandis seedlings on thehumus lateritic red soil．The results showed that（1）there were extremely significant differences in theseedling height，ground diameter and bion1ass between the fertilization treatments and the controI treatment；（2）except the root biomass of single Zn application treatment and the stem，branch and root biomass of sin-gle B application treatment，the indexes（height，diameter and biomass）of various treatments were higherthan those of the control treatment and the differences were significant；（3）the ratios of height and diameterof the treatments containing P element were less than that of the control treatment，on the contrary the ratioof height and diameter of the treatment containlng single Zn or B element was higher than that of the controltreatment；and（4）based on the height，ground diameter，above-ground biomass，underground biornass andtotal biomass，the order of various fertilization treatments was as follows from the excellent to the poor：P＋Zn＞P＋Zn＋B＞P＞Zn＞B＞Control.