Organic and phosphorus fertilization of corn (Zea mays L.) on limed ultisols
2003
Lapoot, C.R. | Duna, L.V. | Salvani, J.B.Ramos, L.A. | Maghanoy, C.C. Jr (Department of Agriculture, Dalwangan, Malaybalay City, Bukidnon (Philippines). Regional Field Unit 10)
Low yield of corn is still the dominant problem besetting the country's major corn growing areas due to soil infertility. A field experiment was conducted to evaluate the long term fertility effect and profitability of chicken manure [CM] and phosphorus fertilization on limed ultisols grown to corn. Results of the study showed that pH of the soil declined after 3 years of CM application and 2 years without CM. Organic matter and available P in the soil improved with the application of chicken manure. The exchangeable K slightly improved with the CM application and decline with time. Application of CM from 2.5 to 5 tons CM per hectare increased yield of corn from 3.17 to 3.56 and 4.76 tons/ha during the wet cropping season. The yield of corn was further enhanced with the combined application of CM with increasing rates of phosphorus (60, 120 and 180 P205/ha). During the dry cropping season, yield of corn was also increased with increasing rates of CM and P and further increased with the combined application of CM and P and their combinations. Economic analysis revealed that application of 60 kg P205/ha alone gave the highest Marginal Rate of Return of 601.84 and 564.05 percent during the wet and dry cropping season
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