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Abstract
The effects of carbon (C) levels on growth, photosynthesis, chlorophyll content, and nutrient partitioning on five kenaf varieties were investigated. Kenaf plants were grown in pots containing sandy beach ridges interspersed with swales (BRIS) soil. Organic carbon at levels of 0, 10, 20, 30, and 40 t ha−1, were applied to the pots. The results showed that plant height, stem diameter, leaf number, leaf area, chlorophyll content and photosynthesis rate increased with an increase in carbon levels up to 20 t ha−1but decreased with additional increase in carbon levels. The proportion of nitrogen in leaves was minimum at 0 and maximum at 20 t ha−1carbon levels. In stem and roots, proportion of nitrogen (N) decreased after 10 t ha−1carbon, while in leaves phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) increased after 20 t ha−1. Variety HC2 showed maximum N, P, and K in leaves and total nutrient content.
ACKNOWLEDGMENTS
This research was financially supported by the Ministry of Higher Education (MOHE) top-down research grant. The authors wish to thank to Mr. Baharoom Zainal for providing seeds of different kenaf varieties and to Mr. Abdur Rahman and other staff members of experimental farm no. 2, Faculty of Agriculture, UPM for their help with supplying facilities in the shade house.