Yield potential of recently released and popular rice varieties
2004
Malabayabas, M.D. | Cruz, R.T. | Santin, C.A. | Collado, W.B. (Philippine Rice Research Inst., Maligaya, Munoz, Nueva Ecija (Philippines). Central Experiment Station) Descalsota, J.P. | Peralta, M.T.B. | Mamaril, C.P. | Lawas, R.M. | Gecolea, N.O. | Movillon, M.M.
Yields with LCC [leaf color chart]-based N application ranged from 6.9 to 7.9 t/ha in DS [dry season] and 2.2 to 5.9 t/ha in WS [wet season]. There were no significant yield differences between LCC and yield target-based N application although agronomic fertilizer N use efficiency was higher with LCC. Total N uptake (straw + grain) did not differ significantly among the six varieties, but there was significant interaction between fertilizer rates and varieties. With 7 t/ha yield target, Rc82 gave highest N uptake although not different from Rc18, Rc28 and Rc72H. The N uptakewith LCC-based and 9 t/ha yield target-based N application did not differ. N management methods had no significant effect on leaf area index (LAI). Rc72 had significantly high LAI at MT and PI during DS; LAI were similar among WS varieties at MT. The highest LAI at FF was obtained in Rc82, which also gave the highest WS yield. Total aboveground biomass was generally higher at physiological maturity (PM) especially with 216-138-164 kg NPK/ha. Tiller number/sq m ranged from 509 to 652 in LCC-based N-69-82 kg NPK/ha, 494 to 696 with 148-69-82 kg NPK/ha, and 594 to 677 with 216-138-164 kg NPK/ha. Earlier simulation of potential yield, based on Rc14 crop parameters, showed that 9 t/ha could be obtained in Iguig, Cagayan [Philippines] where solar radiation or irradiance was highest, and minimum and maximum air temperatures were lowest (Cruz et al. 1996 AB-DLO, TPE-WAU, Netherlands). Low temperature could lengthen the grain filling duration and translate to higher yield
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