Evaluation of indigenous phosphate rocks in an ultisol: effect of application rate, and Chromolaena odorata L. supplement on phosphorus availability and corn yield
1994
Castillo, E.H. | Nartea, R.N. (Palawan National Agricultural Coll., Aborlan, Palawan (Philippines))
The study aimed to seek some ways of using indigenous phosphate rocks (PRs), which were ground to pass a 100-mesh sieve, for direct application as fertilizers in greenhouse experiments. Corn was the test crop and soil used was Aborlan sandy loam. Citrate soluble-P of the PRs was as available to corn as that of ordinary superphosphate (OSP). OSP supplement did not increase the effectiveness of PRs. The medium reactive PR at 45 kg P2O5 plus 45 tons of fresh herbage of Chromolaena odorata per hectare was the most effective in terms of corn dry matter yield. Soil available P after the trials increased as the PR application rate increased with or without OSP or C. odorata supplements
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