Effects of soils of Hopea odorata, Khaya anthotheca and Terminalia arjuna stands on the growth and nodulation of Leucaena leucocephala
1985
Suriamihardja, S. | Rostiwati, T.
The experiment was undertaken to determine the effects of forest soils on growth and root nodulation of Lamtoro gung (Salvador-type Leucaena leucocephala). The seeds of Lamtoro gung were planted in plastic bags filled with soils collected from 30 year-old stands of Hopea odorata (treatment Ho), Khaya anthotheca (treatment Ka), and Terminalia arjuna (treatment Ta); the stands were situated in a region with 1,891 mm mean annual rainfall, 50 m elevation, and association of red latosol-reddish latosol-laterite soil. The experiment was laid out a completely randomized design with 25 replications (each treatment consisted of 25 seedlings). The seedlings were kept for ten months in a nursery established near the stands. At the end of the experiment, measurements were taken for stem height and diameter, number of root nodules, and dry weight of root nodules. The results indicated significant effects of the treatments on stem height, stem diameter, number of root nodules, and dry weight of root nodules; the average number of nodules per individual plant was 25. Based on height and diameter growth, Lamtoro gung treated with the Ho grew better than those treated with the Ka and Ta. This better growth was supported by large root nodules. The growth and root nodulation became poorer with the Ka and Ta, respectively. On the basis of this order, it was apparent that the decrease of growth of Lamtoro gung was in the direction of the decrease in soil pH (5.4-4.7), total nitrogen content (0.139 percent - 0.076 percent), and total organic carbon (1.11 percent - 0.82 percent.
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