Optimizing the yield of irrigated lowland rice varieties (hybrid and inbred rice) to a sustainable 4 tons/ha under an organic-based nutrient management
2019
Javier, E.F. | Sevilla, M.L.H. | Mercado, J.M.
A field experiment was carried out during dry and wet season of 2018 to optimize at least one organic-based nutrient management (OBNM) for irrigated rice that would at least yield to a sustainable 4 tons per hectare for both seasons. The organic-based nutrient management (OBNM) was the basal application of rice straw plus chicken manure (OBNM1), and rice straw plus vermicompost (OBNM2). Azolla microphylla was applied as alternative topdress fertilizer at 30 and 45 days after transplanting (DAT). Inorganic-based nutrient management (IBNM) following keycheck No.5 of the Palaycheck System served as check. Test plants were high yielding inbred and hybrid varieties. The experiment was replicated four times in a split plot factorial experimental design. In dry season, the highest grain yield was observed in IBNM for both hybrid (7.89 t/ha) and inbred (7.18 t/ha) varieties. While the lowest grain yield were recorded in OBNM2 (Rice straw with vermicompost and topdressed of Azolla at 30 and 45 DAT) for both inbred (4.09 t/ha) and hybrid (4.64 t/ha) varieties. The hybrid rice (5.245 t/ha) under the OBNM1 generally have higher yield than the inbred (4.27 t/ha) in the dry season. In the wet season, the yield of the IBNM, OBNM1 and OBNM2 was comparable. Under the OBNM, the inbred variety (4.68 t/ha) gave higher yield than the hybrid rice (4.09 t/ha). With the annual average yield ranging from 4.28 to 5.06 tons/ha under OBNM even in flooded soils showed potential in increasing the grain yield by the recycling farm wastes. However, judicious use of organic waste like proper timing of application of farm waste should be considered due to their mineralization process under flooded soil condition.
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