Controlled irrigation in leaf color chart-based and growth stage-based nitrogen management
2008
Samoy, K.C. | Cantre, M.A. | Corpuz, A.C. | de Dios, J.L. | Sibayan, E.D. | Cruz, R.T., Philippine Rice Research Inst., Maligaya, Science City of Munoz, Nueva Ecija (Philippines). Central Experiment Station
Compared to other crops, irrigated lowland rice consumes a lot of water. Under ideal condition and with good farm management, water use ranged from 700 to 1500 m of water in medium-to heavy textured soils. With the increasing demand for water by agricultural and non-agricultural sectors, we are faced with a major challenge to increase crop productivity while saving on water. In dry season of 2006 and 2007 (Maligaya clay soil), grain yield of PSB Rc82 was assessed under two irrigation regimes: a) continuously flooded (CF)- maintained water depth of 3 to 5 cm; and b) controlled irrigation (CI)-irrigated with 3 to 5 cm water depth when perch water table reached 15 cm below soil surface. Under CF and CI, two nutrient management technologies were used: (a) leaf color chart N-based management (LCC-NM) wherein N fertilizer was applied based on 'real time' crop need, and (b) growth stage-based nutrient management (GS-NM) wherein N fertilizer was applied at critical crop growth stages. In 2006, results showed that grain yield of 6.0-6.5 t/ha were comparable with LCC-NM and GS-NM under CF and CI water schemes. In 2007, close to 7t/ha was obtained with LCC-NM and GS-NM and GS-NM under CF and CI. The total N fertilizer rates used were 110 kg N/ha with LCC-NM and 120 kg N/ha with GS-NM. Thus, with CI, it is possible to save water and maintain high yield whether with LCC-NM and GS-NM.
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