Growth and Physiological Responses of Azadlrachta Excelsa (Jack) Jacobs to Fertilizer and Mycorrhizal Applications
Azadirachta excelsa (Jack) Jacobs is a fast growing multi-purpose tree species and is one of the species that is being promoted for planting in Malaysia. However, the silvicultural requirements of the species have not been well defined. The objective of this study was to evaluate the effects of f...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1998
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| Online Access: | http://psasir.upm.edu.my/id/eprint/9954/1/FH_1998_2_A.pdf http://psasir.upm.edu.my/id/eprint/9954/ |
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| Summary: | Azadirachta excelsa (Jack) Jacobs is a fast growing multi-purpose tree species
and is one of the species that is being promoted for planting in Malaysia. However, the
silvicultural requirements of the species have not been well defined. The objective of this
study was to evaluate the effects of fertilizers, mycorrhizal inoculation and mixed
planting with A cacia mangium Willd seedlings on the growth and physiological changes
of A. excelsa seedlings on Rengam series soil.
The study consisted of two components. The pot trial examined the physiological
changes and growth performance of A. excelsa seedlings in response to various fertilizer
and mycorrhizal treatments using soil collected from the field. The field trial examined
the seedling performance under field conditions when applied with fertilizer and
mycorrhizal treatments, as well as mixed planted with A. mangium.
Results from the four month pot trial showed that fertilized seedlings grew better
than the control plants. Among the fertilizer treatments, Best-Tab slow release fertilizer
(20-10-5 NPK with expanded minor and secondary element in 21 g tablet) promoted the
best growth with maximum photosynthesis, followed by 40 g of NPK fertilizer (15-15-15 fertilizer (15-15-15 NPK) and finally 20 g of NPK fertilizer (15-15-15 NPK). In contrast,
mycorrhizal application failed to promote seedling growth in a similar way. Similarly,
combination of treatments failed to improve seedling growth as compared to either slow
release fertilizer or NPK fertilizer alone. |
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