Sains Malaysiana 42(3)(2013): 257–263

 

Effect of Light Intensity and Fertiliser Levels on the Stock Plants of Chengal

(Neobalanocarpus heimii) and Rooting of Its Subsequent Cuttings

(Kesan Keamatan Cahaya dan Kadar Baja ke Atas Pokok Stok Chengal (Neobalanocarpus heimii)

dan Pengakaran Keratan)

 

H. Aminah*, C.L. Naimah, R.S. Raja Barizan & M. Mohd Noor

Forest Research Institute Malaysia (FRIM), 52109 Kepong, Kuala Lumpur, Malaysia

 

Received: 20 January 2012 / Accepted: 4 October 2012

 

ABSTRACT

A factorial experiment of three light intensities and three fertiliser levels was carried out on the potted seedlings of Neobalanocarpus heimii as stock plants for subsequent rooting of cuttings. Light intensities used were 25%, 50% and 100% of the open sunlight and the fertilizer levels were 0 g, 1 g and 2 g plant-1 month-1. Results of 11 months after potting showed that the stock plants treated with 1 g and 2 g fertilizer had significantly better height and diameter increments than those without fertilizer in all light intensities tried. On the other hand, no significant effect of light intensity was obtained in height and diameter increments of the stock plants. Survival of stock plants of more than 86% was obtained in all light intensities tried with or without fertilizer application. Test on rooting of subsequent cuttings showed that light intensity of 25% and 0 g fertiliser, to stock plants gave the highest rooting percentage (73%) and the number of roots (2.0). The general trend showed that rooting decreased to below 60% when intensity of light was increased. In terms of size, cuttings with diameter between 1.2 mm and 2.3 mm is recommended as it yielded rooting of 65% to 75%. For practical application, a combination of 25% light intensity and 1 g of fertilizer plant-1 month-1 can be applied to the stock plants to maintain their healthy growth for continuous production of cutting materials for rooting.

 

Keywords: Diameter; dipterocarp; height; rooting percentage

 

ABSTRAK

Satu uji kaji faktorial tiga keamatan cahaya dan tiga kadar baja telah dilakukan ke atas anak benih Neobalanocarpus heimii di dalam tabung sebagai pokok stok untuk tujuan pengakaran keratan. Keamatan cahaya yang digunakan ialah 25%, 50% dan 100% pendedahan kepada cahaya matahari, manakala kadar penggunaan baja pula 0 g, 1 g dan 2 g pokok-1 bulan-1. Keputusan yang diperoleh selepas 11 bulan di tabung menunjukkan pokok stok yang dibaja dengan 1 g dan 2 g baja mempunyai peningkatan ketinggian dan diameter yang signifikan dan lebih baik berbanding dengan pokok stok yang tidak dibaja pada semua keamatan cahaya yang diuji. Walau bagaimanapun, tidak ada perbezaan yang bererti dalam peningkatan ketinggian dan diameter pokok stok pada tiga keamatan cahaya yang digunakan. Didapati kemandirian pokok stok adalah lebih daripada 86% untuk semua keamatan cahaya yang dicuba sama ada diberi baja ataupun tidak. Daripada segi keupayaan pengakaran, bahan keratan daripada pokok stok yang ditempatkan di bawah 25% keamatan cahaya dan 0 g baja memberi peratus pengakaran (73%) dan jumlah akar yang tertinggi (2.0). Secara amnya pengakaran keratan mula menurun kurang daripada 60% apabila keamatan cahaya ditingkatkan. Walau bagaimanapun, bagi mengekalkan pertumbuhan pokok stok yang sihat dan untuk mendapat bahan keratan yang berterusan bagi tujuan pengakaran, pembajaan 1 g pokok-1 bulan-1 adalah disyorkan.

 

Kata kunci: Diameter; dipterokarpa; peratus pengakaran; tinggi

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*Corresponding author; email: aminah@frim.gov.my