Rice ratooning ability in response to cutting height, water, and nutrient management
2013
Bascon, M.V.R. | Cruz, R.T. | Regalado, M.J.C.
Due to increasing demand for rice by the population, rice cropping can be intensified through rice ratooning and quick turn-around to fit in three crops. Rice ratooning is an alternative strategy to intensify production per unit area and time. Ratooning is the resumption of tiller growth from the main crop after harvest. Field experiment was conducted in 2012 dry season to determine the ratooning ability in terms of tiller production and grain yield of popular rice genotypes NSIC Rc160 and PSB Rc82 in response to different water, nutrient and cutting levels. After the main crop harvest (with average yield of 7.5 t/ha), the following treatments were imposed: (1) 30 cm and 20 cm cutting heights (2) flooding right after harvest or early flooding and flooding one week after harvest or late flooding with 2-3 cm water depth and (3) 0, 30, 60 and 90 kg urea N/ha. The highest tiller production of 19 tillers/hill was observed for PSB Rc82 at 30 cm cutting height and 90 kg urea N/ha. Tiller production did not differ between early and late flooding for both varieties. However, grain yield was higher for NSIC Rc160 (0.7 ton/ha) than PSB Rc82 (0.5 ton/ha) at 30 cm cutting height and 90 kg N/ha.
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