| Summary: | 碩士 === 國立臺灣大學 === 森林學系 === 84 === The purpose of this study was to investigate the effects of
fertilization on the growth of Formosan michelia seedlings.
Bassed on the information obtained from the experiment, the
nursery manager coued breed the seedlings in the situstion of
nutritive equiltbrium. From July to September in 1995,
seedlings were fertilized six times. Twelve treatment
combinations of N, P with 4 levels of nitrogen (100, 200, 300,
400 kg/ha), and 3 levels (50, 100, 150 kg/ha) of phosphorus
fertilizer. The effects of fertilization on the height,
morphology, physiological characteristics, root growth
potential of seedlings and the nutrient in soil after
fertilization were measured.According to the result of the
experiment luxur, N300P150(kg/ha) was the best treatment
combination for seedling growth height both and root collar
growth would be enbaneed predominantly by application of N300(
kg/ha). On the contrary, Application of N400(kg/ha) showed poor
result, which indicates that luxury of nitrogen fertilizer
inhibit the growth of seedlings . In addition the interaction
between N and P on seedlings growth was sign ficant. The
amount of soluble sugars in plants ws higher when application
level of nitrogen fertilizer was higher, but the interaction
between N and P fertilizer was no significant. The pH of the
medium would be effected by the nitrogen fertilizer. The main
effect of phosphorus fertilizer was to increase the total and
mean length of new root growrh. Starch concentration was
influenced by the interaction of P and N. Therefore,
applicationof suitable proporti+on of nitrogen (N) and
phosphorus (P)fertilizer could promote the growth of seedlings
in height and diameter at root collar and improve the
physiological charaeteristics of Formosan mochelia seedlings.
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