Intermittent irrigation and yield of transplanted lowland rice
1998
De Dios, J.L. | Corpuz, A.A. | Punzalan, E.M.S. | Quiland, J.P. | Cruz, R.T. (Philippine Rice Research Inst., Maligaya, Munoz, 3119 Nueva Ecija (Philippines))
A field experiment was conducted at PhilRice Experiment Station (Maligaya clay type) during the 1997 dry season. Four NPK fertilizer levels (0-0-0, 60-60-60 and 180-60-60 kg/ha) and two irrigation techniques (a) intermittent irrigation which applied 5 cm water every 14 days from 10 to 80 days after transplanting (DAT) and (b) continuous flooding wherein 1-5 cm of water was maintained above soil surface were used. Water applied was measured by V-notch Weir method. Intermittent irrigation (2) significantly reduced the cumulative water applied without any reduction in yield. Rice yield ranged from 3.3 to 8.4 t/ha with 2 and 4.1 to 8.2 t/ha with continuous flooding (CF). Significant yield differences were observed across fertilizer levels only. The cumulative water applied for 2, during the growing season (10 to 80 DAT) was 828 mm. This translates to 40 percent reduction in irrigation in the 2 treatment based on CF. The cumulative water applied for CF from this experiment was 1,369 mm. This was within the 1000 to 4000 mm total water requirement ranges for irrigated lowland rice based on rainfall, drainage, estimated evaporation and transpiration for a large number of rice fields in the Philippines. Therefore, intermittent irrigation method can be used to save on cost of irrigation on clayey soils during the dry season without sacrificing yield
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