Seed yield and quality of PSB rice varieties as influenced by N levels and harvest dates
2000
Dimala, A.M. (Mindanao State Univ., Marawi City, Lanao del Sur (Philippines))
Field and laboratory studies were conducted to investigate the effects of nitrogen (N) levels and harvest dates on seed yield and quality of four Philippine Seed Board (PSB)-released rice varieties. The field experiment was laid out in split-split plot design with three replications. The levels of N were assigned as main plots (30, 60, 90, and 120 kg/ha), the varieties (PSB Rc4, PSB Rc8, PSB Rc12, and PSB Rc30) as subplots, and the harvest dates (20, 23, 26, 29, 32, and 35 days after anthesis (DAA)) as the sub-subplots. Results showed that N application of 90 kg/ha increased the height, dry matter yield, tiller number, and productive tillers of rice varieties as well as grain yield and grain-straw ratio. However, the flowering and maturity of rice varieties, total spikelets per panicle, number of percentage of filled grains per panicle, and 1000-seed weight were not significantly affected. Seeds harvested at 20-26 DAA from plants applied with 30-60 kg N/ha had low percentage germination right after harvest and after breaking their dormancy. Higher percentage germination was observed after accelerated aging of seeds from plants fertilized with 30-60 kg N/ha at 29-32 DAA. Seeds harvested at 29-30 DAA and applied with 30-60 kg N/ha remained vigorous after aging. Seeds harvested at 29-32 DAA had better seed quality and storability than those harvested at earlier or later dates
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