Efficacy test of guano and sunflower leaves as organic fertilizer on Maapag clay with corn as test crop
1988
Labay, A.M. Jr. (Central Mindanao Univ., Musuan, Bukidnon (Philippines). Dept. of Soil Science)
Guano and sunflower leaves as organic fertilizers were tested in the field to achieve the following objectives: a) to assess the N and P contribution of guano and sunflower leaves on the growth and yield of corn; b) to determine the effects of guano and sunflower leaves as organic fertilizers on Maapag clay; and c) to compare the economics of using guano and sunflower leaves with inorganic fertilizers on the yield of corn. The treatments were laid out in a 3 x 4 split plot design in three replications. Sunflower and guano were apllied two weeks before planting and mineralized N and available P were analyzed after two weeks. Dry matter yield was not significantly increased with the application of sunflower leaves and guano. A significant result of grain yield over the control was observed in treatments applied with 2- ton and 4- ton- sunflower leaves/hectare. Increasing rates of sunflower leaves and guano application decreased soil mineralized N and soil phosphorus after harvest. The addition of sunflower leaves and guano increased soil pH, but organic matter declined after harvest.
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