The effect of N and P fertilization on growth of young mahogany (Swietenia macrophylla)
1990
Murniati | Mindawati, N.
The effect of nitrogen and phosphate fertilizers on one year old mahogany (Swietenia macrophylla) plantation was studied during August 1988 in the compartment 56 C, Kedung Galar Sub Forest District, Ngawi Forest District, East Java. Nitrogen and phosphate fertilizer were applied by using broadcast method in circles of 30 cm radius around the tree. Six levels of nitrogen fertilizer : 0; 21; 4.2; 6.3; 8.4 and 10.5 g N/tree and six levels of phosphate fertilizer : 0; 2.3; 4.6; 6.9;9.2; and 11.5 g P2O5/tree were used. The tree spacing is 2 x 2 m. Height and diameter growth were recorded from ten sample trees from each plot. To investigate the effect of fertilizer treatments on the parameters observed, the analysis of variance was used with randomized complete block design. The results showed that nitrogen and phosphate fertilizers did not significantly affect height and diameter growth of mahogany, but the combined application of N3P5 fertilizers (6.3 g N/tree; 11.5 g P2O5/tree) increased height growth by 30.3 percent and the combined application of N4P5 fertilizers (84. g N/tree; 11.5 g P2O5/tree) increased diameter growth by 34.0 percent compared with control
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