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Management Strategies for Rice Under Lowland Rainfed Condition
Thesis Abstract:
The agronomic response of rice to various fertilizer levels, seedling ages, and seedling rates was in vestigated during the dry season of 1992 at the lowland rainfed area of the ltawes Nat ional Agricultural and Technical School, Tuao, Cagayan, Northern Philippines.
The area was clay loam with a pH of 6.0. The soil contained 1.5 percent organic matter, 6 ppm ava ilable phosphorus. and 60 ppm available potassium.
The treatments were composed of five levels of fertilizer (0-0-0, 50-40-40, 100-40-40, 150-40-40, and 200-40-40 kg NPK/ha), three seedling ages (30, 40, and 50 days old), and two seedling rates (4 and 6 seedlings per hill). The experiment was laid out in a split-split plot arranged in randomized complete block design.
Most of the agronomic characteristics of rice were favored by the application of 150-40-40 kg NPK/ha. At this level, plants had the highest grain yield considerably because of heavier grains and fewer unproductive tillers.
Plants transplanted at 50 days old had the highest grain yield because of more productive tillers and fewer unfilled grains. Moreover, grain yield was significantly higher in plants transplanted at six seedlings/ hill, also because of more productive tillers and lesser unfilled grains.
The combination of fertilizer level at 150-40-40 kg NPK/ha, seedling age of 50 days old, and six seedlings/hill indicated better plant performance in terms of grain yield although most of the yield components were significantly affected by these combined factors.
The nitrogen content of the straw increased considerably with the application of 200-40-40 kg NPK/ha, but the level of phosphorus in the soil decreased significantly.
Plots planted with 50-day-old seedlings had higher concentration of nitrogen but lower concentration of phosphorus.
