Malaysian Applied Biology Journal

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28-1&2-07

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Malays. Appl. Biol. (1999) 28(1&2): 37-42

GROWTH RESPONSE OF SENTANG SEEDLINGS TO NITROGEN AND PHOSPHORUS APPLICATION

ONG KIAN HUAT*, KAMIS AWANG and THOMAS W. KIMMERER

Faculty of Forestry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

ABSTRACT

Potted seedlings of sentang, Amdirachta excelsa (Jack) Jacobs, were initially grown in potting medium without any addition of fertiliser. Four treatments were later applied: (1) complete fertiliser with N and P (NP), (2) without P nutrition (N), (3) without N nutrition (P) and (4) without N and P (control). Height and leaf area growth, dry weight production, plant N and P concentrations were measured. Height and leaf area increments, and dry weight production were all greater in plants treated with N and P. However, the ratio of root to shoot remained constant suggesting that sentang appears to have a low nutrient use efficiency. Foliar N and P concentrations in seedlings treated with N and P tended to be lower compared to seedlings treated with N or P alone suggesting possible antagonistic effects when N and P were applied together. The results also indicated that height growth could be due mainly to large leaf area which enabled plants to intercept large amounts of light and grow rapidly.


Key words: nitrogen, phosphorus, sentang, Azadirachta excelsa, growth.

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