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- Performance of Rice and Nutrient Availability on Two Philippines soil...
Performance of Rice and Nutrient Availability on Two Philippines soil as Affected by Different Water Regimes and Soil Amendments .
Thesis Abstract:
Greenhouse experiments were conducted to determine the effects of water regimes, addition of phosphorus and organic matter (rice straw), application of acid and lime on the chemical changes and growth of rice on Lipa clay loam and Luisiana clay.
Results showed that regime did not significantly affect grain yield on Lipa soil, although nonsubmergence gave considerably higher straw yield. Submerged Luisina soil markedly decreased both vegetative growth and grain and straw yields owing to high iron content and low potassium, magnesium and manganese.
Applied phosphorus fertilizer appreciably increased phosphorus availability in Lipa soil but only slightly in Luisiana soil. Rice plants on Lipa soil responded favorable to phosphorus under nonsumberged but not under submerged condition. Phosphorus application in Luisiana soil markedly increased rice growth and yield, with greater effects in nonsubmerged regime.
The marked increase of iron, manganese and sulfur contents in plants grown on acidified nonsubmerged Lipa soil consequently increased vegetative growth and yield. In contrast the reduction in iron and manganese concentration and increase in that of potassium and calcium in limed Luisiana soil consequently depressed plant growth and yield especially under submerged regime. Chemical analysis of the straw showed low manganese and magnesium contents but high calcium and nitrogen.
Incorporation of organic matter (rice straw) slightly increased grain yield on nonsubmerged Luisiana soil but decreased both grain and straw yield on Lipa soil under either water regime.
Acidification increased phosphorus level in Lipa, while lime applied at 9.5 tons per hectare depressed phosphorus availability in Luisiana soil. Organic matter markedly increased potassium content owing to the release of this element from added rice straw.