Effect of liming and TSP fertilization on growth of velvet bean in a highly weathered ultisol
1999
Budianta, D. (Universitas Sriwijaya, Palembang (Indonesia). Fakultas Pertanian)
In order to study the effect of liming and TSP fertilization on the growth of Velvet bean with aiming to produce green manure, a field experiment was conducted in a highly weathered ultisol. The experiment was carried out at Sembawa Rubber Research Station, South Sumatra, Indonesia. Two sowing dates were chosen, one immediately and the other 4 months after application of P at 200 kg TSP and dolomite at 4.14 tons per ha. Results show that liming and P application affect biomass yield, and plant dry matter obtained ranged from 2.20 to 3.99 tons per ha. Effect of lime to increase the biomass yield is more pronounced than P application. Phosphorus content in dry matter ranged from 0.15 to 0.26 percent was not increased by liming, but content of Ca was obtained a positive correlation with the biomass yield resulting in a linear equation: biomass (tons/ha) = (1.51+-0.23) + 4.37+-0.62) Ca(percent), r= 0.95 **. Sowing delay of 4 months did not influence the biomass production and soil properties observed. Application of a single dose P fertilizer at 200 kg TSP per ha did not affect soil pH and exchangeable Al, but this P treatment is able to contribute the increase of Ca in the plant and in the soil. Combination of a P fertilizer and lime depressed Ca content in plant, but not in the soil
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