Water use efficiency of promising lines and popular rice varieties under irrigated lowland system
2005
Cantre, M.A.T. | De Dios, J.L. | Malabayabas, M.D. | Sibayan, E.B. | Cruz, R.T., Philippine Rice Research Inst., Maligaya, Science City of Munoz, Nueva Ecija (Philippines)
Water use efficiency (WUE) relates grain yield to process depletion. Increasing WUE can be achieved by increasing production per evapotranspiration (ET), using better varieties and proper crop management. Thus, assessing WUE of promising lines and popular rice varieties will be helpful in the genotypic selection and in improving resource use efficiency. One promising line (IR 77298) and two popular rice varieties (PSB Rc82 and Mestizo 3) were evaluated during dry and wet seasons of 2006 at PhilRice Central Experiment Station, Munoz, Nueva Ecija to assess their WUE with no N (+PK) and complete (+NPK) fertilizer treatments under flooded condition. Grain yeilds were higher under complete fertilizer plots (6.2-7.4 t/ha) compared to yields in zero N fertilizer plots (3.9-4.2 t/ha). IR 77298 attained the highest yield of 7.4 t/ha under complete fertilizer plots. WUE of PSB Rc82, Mestizo 3 and IR 77298 did not vary among fertilizer treatments. WUE ranged from 0.54-0.61 g/kg in no N plots and 0.86-1.06 g/kg in complete fertilizer plots. Mestizo 3 showed highest WUE in both fertilizer treatments. In wet season, slightly higher yields in complete fertilizer plots (4.8-6.0 t/ha) than in no N plots (4.7-5.7 t/ha) were observed. PSB Rc82 produced the highest yield of 6.0 t/ha. WUE of the three rice entries among the two fertilizer treatments did not differed. Under both fertilizer treatments, WUE ranged from 0.99-1.22 g/kg. Highest WUE of 1.22 g/kg was obtained by PSB Rc82 under complete fertilizer plot. WUE's of the three rice entries with complete fertilizer (+NPK) were higher than with no N (+PK) fertilizer. But under flooded soil condition, varietal response in terms of WUE did not significantly vary. Thus, further validations of WUE must be pursued using wider selection of promising lines/varieties and adopting different water management schemes.
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