Potential organic sources of plant nutrients and soil ameliorant in improving productivity of acid upland soil in Bukidnon [Philippines]
1999
Cagmat, R.B. | Josue, A.R. (Central Mindanao Univ., Musuan, Bukidnon (Philippines))
Results of the study showed that organic materials, as a substitute for lime, were not very effective in increasing soil pH, giving only a slight increase from pH 4.2 to an average of 4.33 or about 3 percent in 8 months. Lime was the most effective soil ameliorant for increasing soil pH. It increased soil pH from about pH 4.2 to 7.72 or 84 percent. But the effect was short-lived, lasting only three months after application. Four months later, the pH declined quickly to 4.58. In terms of nutrient supply and corn yield, animal manure or a combination of animal manure and plant material was found to be more superior to plant source alone. This was attributed to faster mineralization of nutrients from the plant materials due to the presence of decomposer organisms from the manure. All the organic materials used were considered economically feasible as indicated by their marginal benefit-cost ratio (MBCR) of greater than one. Overall, the organic materials that showed higher potential in increasing soil nutrient levels, corn yield, and net income, were cattle manure, and the 7:2:1 combination of corn cobs, sunflower and chicken manure
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