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Management of acid soils for sustainable food crop production in the Philippines


, : Management of acid soils for sustainable food crop production in the Philippines. Plant soil interactions at low pH: principles and management Proceedings of the Third International Symposium, Brisbane, Queensland, Australia, 12-16 September 1993: 757-760

A study was conducted on an acid soil in the Philippines to evaluate a range of soil and crop management practices: (1) continuous native maize with no fertilizer input; (2) continuous hybrid maize with high NPK fertilizer input plus lime; (3) maize-groundnut rotation with low NPK fertilizer input; (4) maize-groundnut rotation with low NPK fertilizer input plus maize cob compost application before maize sowing; (5) maize-groundnut rotation with high NPK fertilizer input plus lime; (6) maize-groundnut rotation with NPK fertilizer input, lime plus maize cob compost. Soil pH of the lime-treated plots increased 2 months after lime application and exchangeable Al contents of the surface soil were reduced. The maize yields without rotation were low. Rotation led to higher maize yields. The highest yield was obtained in treatment 6. Treatment 1 gave a higher net income than treatment 2, although it was doubtful if this was sustainable. Crop rotations gave higher net incomes than monocrop treatments.

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