PERFORMANCE OF DIFFERENT UPLAND RICE (ORYZA SATIVA L.) CULTIVARS GROWN UNDER MARGINAL UPLAND ACID SOIL IN INOPACAN, LEYTE, PHILIPPINES
Upland rice has diverse agro-ecological attributes that can tolerate changes brought by climate change. This study was conducted to; a.) evaluate the agronomic and yield performance of upland rice; b.) identify the most suitable cultivars; and c.) evaluate its profitability under the marginal upland acid soil in Inopacan, Leyte. The area (710 m2) was laid out in Randomized Complete Block Design (RCBD) with three replications. Twelve upland rice cultivars were designated as treatments. All treatments were applied uniformly with inorganic fertilizer at the rate of 90-6060 kg ha-1 N, P2O5, K2O using complete fertilizer (1414-14) and urea (46-0-0). Differences were noted on agronomic characteristics, root and shoot parameters and as well as yield and yield components. Among cultivars, improved upland rice varieties NSIC Rc27 and Rc192 markedly headed and matured earlier than traditional cultivars. Speaker and Perya cultivars grew taller and produced longer panicles while KalinayanMonos and Perya developed longer and broader leaves. Meanwhile, Tukoran, Caimpas, Kalinayan-monos and Speaker had heavier root weight while Kalinayanmonos, Speaker, Tukoran and Remolites produced heavier shoot weight. Improved varieties NSIC Rc27 and NSIC Rc192 were noted to have higher root: shoot ratio. In terms of yield, Tukoran cultivar produced higher grain yield comparable to Kalinayan-monos, Caimpas, Speaker and Remolites. However, it is only Tukoran cultivar that generated highest gross margin of PhP 6,186.32. This indicates the high adaptability of Tukoran to marginal upland acid soil.