Response of sweet potato to pressurized irrigation under varying irrigation regimes and planting methods.

摘要

A study was conducted in Rahuri, Maharashtra, India, during the rabi season of 2004-05 to determine the effect of irrigation schedules under different pressurized irrigation systems and planting methods on sweet potato. There were 30 treatment combinations comprising 2 planting methods, i.e. ridges and furrows and broad bed furrows, and 3 irrigation systems, i.e. drip, sprinkler and surface, with 5 irrigation regimes, i.e. irrigation schedule at 25 mm cumulative pan evaporation (CPE) for sprinkler system with 1.5, 2.0, 2.5, 3.0 and 3.5 cm depth, at 50 mm CPE for surface with 3, 4, 5, 6 and 7 cm depth, and 0.5, 0.6, 0.7, 0.8 and 0.9 composite factor for drip. The mean number of tubers per plant, their average volume and weight were not significantly influenced either due to broad bed furrow or ridges and furrows, whereas the length and girth of tubers were significantly greater when raised on broad bed furrows. The effect of planting method on tuber yield of sweet potato not significant. The mean number of tubers was not significantly influenced due to any of the irrigation methods but the drip irrigation recorded significantly greater length, girth, volume and weight of tubers than the surface and sprinkler methods of irrigation. Significantly the highest tuber yield (18.33 t/ha) was obtained with drip irrigation. Irrigation scheduling with 3.0 cm depth at 25 mm CPE by sprinkler, depth of 6.0 cm at 50 mm CPE by surface and 0.8 composite factor for drip recorded significantly higher values for tuber number, length, girth, volume and weight than the other regimes. The tuber yield was also significantly increase due to this regime.