UTILIZATION OF VERMICOMPOST AND BLACK SOLDIER FLY FRASS IN ORGANIC RICE CULTIVATION
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Abstract
The objective of this study was to evaluate the effects of various types of organic fertilizers, including vermicompost derived from different feedstock compositions and black soldier fly frass (BSF frass), on the growth and yield components of Oryza sativa L. cv. RD43 under controlled pot cultivation conditions. A randomized complete block design (RCBD) was employed with five treatments and four replications. The results demonstrated that rice plants receiving BSF frass exhibited superior performance in several growth and yield parameters. Specifically, BSF frass treatment resulted in the highest average plant height (112.12 cm), number of tillers per clump (16.25), number of panicles per clump (14.00), and grains per panicle (141.06), when compared to other treatments. In terms of chlorophyll content, the BSF frass treatment recorded the highest SPAD value at 43 days after transplanting (36.27 SPAD units), although not significantly different from the vermicompost treatments. With respect to grain quality, the application of vermicompost produced from cow dung mixed with rice bran at a 70:30 ratio yielded the highest percentage of filled grains (83.59%), surpassing that of BSF frass. Conversely, although BSF frass resulted in heavier panicle weight, it was associated with a relatively lower 100-grain weight. This outcome is likely attributable to the high grain count per panicle and a correspondingly elevated proportion of unfilled grains. Overall, both types of organic fertilizers demonstrated the potential to enhance growth and yield attributes of RD43 rice effectively. However, further nutrient management strategies during the grain-filling phase should be considered to improve grain quality in organic production systems.
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