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EFFECTS OF ARBUSCULAR MYCORRHIZAL INOCULATION AND FERTILISATION ON THE GROWTH OF ACACIA MANGIUM SEEDLINGS

V Jeyanny, SS Lee and K Wan Rasidah
Journal of Tropical Forest Science
Vol. 23, No. 4 (October 2011), pp. 404-409
Stable URL: http://www.jstor.org/stable/23617053
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
EFFECTS OF ARBUSCULAR MYCORRHIZAL INOCULATION AND FERTILISATION ON THE GROWTH OF ACACIA MANGIUM SEEDLINGS
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Abstract

Acacia mangium is a popular species for forest plantation and is widely used for the production of furniture, particleboard, pulp and paper and wood chips. Proper fertilisation and soil enhancement will further increase its growth and yield for sustainable forest plantation. Arbuscular mycorrhizas (AM) and fertilisation have shown promising results in increasing plant growth and biomass through increased nutrient uptake. However, the combined use of AM inoculation and fertilisation in fast-growing species such as A. mangium needs to be further assessed. The effects of the treatment on the growth of A. mangium seedlings, chemical contents of the growth media and shoot nutrient concentrations were investigated. Pot trials of uninoculated control without fertilisation (control), uninoculated with fertilisation (+NPK), inoculated without fertilisation (+AM) and inoculated with fertilisation (+AM+NPK) were laid out in a complete randomised design. Seedling growth was monitored for three months in the nursery. Shoot height, stem diameter and number of phyllodes were recorded monthly. Root and shoot biomass, root:shoot ratio, mycorrhizal infection rates, nutrient concentrations in media and shoot were determined at the end of the experiment. Treatments with +NPK and +AM+NPK significantly increased plant growth and media nutrient contents of A. mangium seedlings. Shoot nutrient concentrations of +AM fungi were relatively increased with inoculation. Acacia mangium merupakan spesies yang popular untuk perladangan hutan dan digunakan secara meluas untuk pengeluaran perabot, papan serpai, pulpa dan kertas serta serpai kayu. Pembajaan dan rawatan tanah yang sesuai akan meningkatkan lagi tumbesaran dan hasil kayu untuk pengurusan hutan secara mampan. Mikoriza arbuskular (AM) dan pembajaan telah menunjukkan kesan yang baik dalam meningkatkan prestasi tumbesaran pokok serta biojisim melalui penyerapan nutrien. Bagaimanapun, rawatan kombinasi inokulasi AM dan pembajaan untuk spesies yang cepat membesar seperti A. mangium perlu dikaji selidik. Kesan rawatan yang berlainan terhadap tumbesaran anak benih A. mangium, kandungan kimia media pertumbuhan dan kepekatan nutrien dalam pucuk telah dikaji. Kajian yang dijalankan dalam pasu ini terdiri daripada rawatan yang tidak mengandungi inokulasi dan pembajaan (kawalan), pembajaan tanpa inokulasi (+NPK), inokulasi tanpa pembajaan (+AM) dan kombinasi inokulasi serta pembajaan (+AM+NPK) dan kesemuanya disusun dalam reka bentuk rawak lengkap. Pertumbuhan anak benih telah dipantau untuk tiga bulan di tapak semaian. Ketinggian anak benih, diameter batang dan bilangan daun direkod setiap bulan. Biojisim akar dan pucuk, nisbah akar:pucuk, kadar jangkitan mikoriza serta kepekatan nutrien dalam medium dan pucuk telah ditentukan pada akhir eksperimen. Rawatan +NPK dan +AM+NPK telah meningkatkan tumbesaran anak benih dan kandungan nutrien medium A.mangium secara signifikan. Secara relatif inokulasi telah meningkatkan kandungan nutrien pucuk bagi rawatan +AM.

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