Establishment of rainfall runoff Relationship under different land Surface conditions in eastern Dryzone of Karnataka
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Date
2023-01-07
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University of Agricultural Sciences, Bangalore
Abstract
An experiment was conducted during the Kharif season of 2021 to establish rainfall runoff relationship under different land surface condition at the AICRPDA, GKVK, UAS, Bengaluru. The different land surface conditions includes the conservation furrows along with vegetative barriers viz., Nase and Khus grass as an inter terrace management grown across the slope. During kharif season pigeon pea crop was taken to know the effect of moisture conservation measures on crop productivity. Among the two different vegetative barriers, Nase grass (T1) was found to be most effective in controlling runoff and conserving soil moisture. The average runoff generated through the Nase grass (T1) and Khus grass (T̄2) was 8.34% (81.08 mm) and 10.57% (102.70 mm) respectively, than the control (T3) of 12.34% (121.23 mm). The average runoff generated through protected cultivation (T4) was 90.38% (992.01mm) of total rainfall of 1097.60 mm. The higher regression coefficient of 0.9998 was observed in protected cultivation. The lowest regression coefficient 0.9045, 0.9312 and 0.9491 was observed in the Nase grass (T1), Khus grass (T2) and control (T3) respectively. Similarly, the highest moisture conserved at Nase grass was 15.54%, 18.44%, 20.52% and 21.66% at 15cm, 30cm, 45cm and 60cm respectively. At the time of harvest higher plant height (224.13 cm), number of branches (26.37), leaf area (12997 cm2 plant-1), grain yield (1550 kg ha-1), net returns (41978 Rs ha-1) and B:C ratio (2.18) was found to be in Nase grass vegetative barrier plot, due to the conservation of more moisture and reduced runoff