Truong Thi Thao
INTRODUCTION
Serious failures commonly found in sowing Pinus merkusii in the last few years have resulted in a need for research on NPK mineral nutrient requirement of the species at different stages in the first year , which can serve as a basis for finding the most reasonable fertilizing techniques.
RESULTS
Based on analysis of NPK components in leaf and ecological features of Pinus merkusii planted with different NPK treatments at different stages in different media (clean sand and different natural soils) at Nam Son and Hanoi in 1973 – 1976, preliminary remarks can be made as follows,
1. P.merkusii in the first sowing year has different requirements for NPK at different stages.
. N is needed from month 5 to month 8 for rapid growth of newly formed needles. This stage is the time for formation and development of mycorrhiza and rapid increase of biomass.
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Oldest news
- effect of some micro-element on growth and tolerance of p.merkusii in nursery (1973 - 1976)
- study on prevention and control of cercospora needle blight for pines in nursery (1965-1970, 1973, 1977)
- growth situation of some pine species at dailai from 1975 to 1977
- preliminary study on increment rules to serve as temporary basis for p.kesiya management at lamdong province (1977)
- study on biological characteristics of cyrtotrachelus longimarus worms and control measures
