Effect of irrigation and seedling age and number on rice yield
1988
Sidhu, A.S. | Aggarwal, G.C. | Singh, N.T. (Punjab Agricultural Univ., Ludhiana (India). Soils Dept.)
Using variety PR106 on a calcareous sandy loam soil (Typic Ustochrept), treatments with three replications in a split-plot design were laid out. Irrigation was in the main plot and combinations of seedling age and number per hill in the subplots. Irrigation levels were daily irrigation (I1), irrigation on alternate days (I2), and irrigation after 2d (I3). Seedling ages were 32, 45, and 57d and seedling rates were 2 and 3 per hill. The nursery was transplanted 5 Jul. NPK was applied at 120-18-25 kg/ha. Irrigation treatments began, after 3 wk of continuous submergence after transplanting, with 259 cm applied in I1, 210 cm in I2, and 181 cm in I3. The soil had 8.0 pH, low organic C (0.3%), and medium available P (14.5 kg P/ha) and available K (136 kg K/ha). Rice yields were significantly better with daily irrigation, but only with 2 seedlings/hill. Similarly, yields were better with younger (32d) seedlings, but only with 2/hill. Results indicate that transplanting 3 seedlings/hill ameliorated the adverse effect of decreased irrigation as well as of advanced seedling age. Irrigation frequency was significant only when younger seedlings (32d old) were transplanted.
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