WATER PRODUCTIVITY, HYDRAULICS AND ECONOMICS OF FURROW IRRIGATED RAISED BED SYSTEM WITH VARIABLE FURROW SECTIONS FOR WHEAT CROP
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Date
2016
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
A field study was conducted on Water Productivity, Hydraulics and Economics of Furrow Irrigated Raised Bed System with Variable Furrow Sections for Wheat Crop at SVCAET and RS IGKV Raipur (C.G). The treatment included were four main treatments of method of Raised bed furrow irrigation M1 (15 cm furrow depth), M2 (20 cm furrow depth), M3 (25 cm furrow depth) and M4 (border irrigation system(control)) under the three sub-treatments of maximum allowable depletion (MAD) T1 (Irrigation at 40% MAD), T2 (Irrigation at 50% MAD) and T3(Irrigation at 60% MAD ) in four row crop. These treatments were replicated three times. Strip Plot Design was adopted by considering the moisture depletion and method of furrow irrigation as treatment. The observation related to hydraulic parameter of irrigation system, advance and recession time, infiltration rate, irrigation efficiency, and crop production and economics.
Zero inertia and kinematic wave model applied to predict advance and recession time in furrow irrigated raised bed system and border and then compared with observed data.
The result revealed that advance time and recession curve in furrow irrigated raised bed system M1 (15cm furrow depth), and M2 (20cm furrow depth) more parallel then M3 (25cm furrow depth). The parallelism of curves shows uniform distribution of water.
The maximum depth of water applied in 40% MAD (maximum allowable depletion) then the 50% and 60% MAD.
Basic infiltration rate of soil varied from 0.58 to 0.66 cm/hr. Kostiakov infiltration equation (I=Ktα) parameters (K and α) ranged from 1.531 to 1.606 and 0.212 to 0.231 respectively.
The soil moisture content after irrigation along and across the furrow approximately same in M2 and M3.
Zero inertia model predict more reliable results than kinematic wave model.
Mean water application efficiency was found maximum under M2 treatment. However maximum water distribution efficiency found under M1 then M2.
The maximum grain (29.61 q/ha) were produced under M2T2 (20cm furrow depth with 50% MAD) then M1T2 (15cm furrow depth with 50% MAD) in furrow irrigated raised bed system in four row crop. Similarly in border system maximum yield (28.22 q/ha) obtain in M4T2 than M4T1 and M4T3.
The water use efficiency recorded maximum (9.50 kg ha-1 mm-1) under M2T2. Similarly in border system maximum (8.98 kg ha-1 mm-1) recorded in M4T2.
The result obtained under the study revealed that maximum gross return (71910 Rs/ha) and net return (41387 Rs/ha) and maximum cost benefit ratio (2.36) were obtained under M2T2 treatment. Therefor, this system is most economically viable.
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114 p.