Abstract
A filed experiment was conducted at ZARS, V. C. Farm, Mandya to enhance the crop and water productivity in sugarcane during 2017-18 and 2018-19. The design used was strip plot design with planting methods as a horizontal factor and irrigation scheduling as a vertical factor with three replications. Among the planting methods, 120 cm row spaced furrow planting with dhaincha green manure sowing at 30 DAP and mulching at 75 DAP recorded significantly higher cane yield (158.5 and 161.0 t/ha, respectively) as compared to others during both the years of experimentation. Among the irrigation schedules, IW/CPE ratio of 1.0 recorded significantly higher yield (168.1 and 170.8 t/ha, respectively) as compared to IW/CPE ratio of 0.60 (129.7 and 131.8 t/ha, respectively). The total water used was significantly lower in 120 cm spaced furrow planting with alternate skip furrow irrigation afte5r earthing + green manure mulching (1773 and 1751 mm, respectively) and it saved 16% of irrigation water. Scheduling of irrigation at IW/CPE ratio of 0.6 consumed lowest amount of irrigation water (1725 mm) and saved 18% of irrigation water.
Highlights
Among the planting methods, 120 cm row spaced furrow planting with dhaincha green manure sowing at DAP and mulching at 75 DAP recorded significantly higher cane yield (158.5 and 161.0 t/ha, respectively) as compared to others during both the years of experimentation
The total water used was significantly lower in 120 cm spaced furrow planting with alternate skip furrow irrigation afte5r earthing +
There is a linear relationship between the growth rate and optimum soil moisture because only vegetative growth is of economic importance [10]
Summary
Of sugarcane are obtained by maintaining very high moisture in entire rhizosphere. Sugarcane is one of the important tropical crops and requires warm humid climate for efficient solar-energy harvest and to produce 1 tonne sugarcane, the crop needs tonnes water [4]. The major advantage of this approach is that farmers need not change the amount of water applied from one irrigation to another and the event of rain taking care off Irrigation based on this approach permits the computation of a timetable for the irrigation, provided the pattern of pan evaporation does not show much yearly variation during the growing period [8]. In tropical India alternate skip furrow irrigation along with mulching of green manure crops is found to enhance the water use efficiency without reduction in the cane yield. Keeping these in view, the present field experiment was conducted to optimize irrigation schedule in sugarcane under different planting methods.
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