DEVELOPMENT OF CROP MANAGEMENT FACTOR (C) FOR UNIVERSAL SOIL LOSS EQUATION MODEL IN DIFFERENT CROPS UNDER ALFISOLS OF EASTERN DRYZONE OF KARNATAKA
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Date
2023-02-14
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UNIVERSITY OF AGRICULTURAL SCINCES BANGALORE
Abstract
The study on development of crop management factor (C) for universal soil loss equation model in different crops under Alfisols of Eastern Dry Zone of Karnataka was carried out at the AICRP for Dryland Agriculture project, UAS, GKVK, Bengaluru. The experiment was conducted in six plots with five crops i.e., field bean, cowpea, groundnut, green gram, finger millet and control plot (No crop). During the crop growth period there was nine rainfall events which caused runoff. The rainfall of 62.4 mm recorded on 31st July, caused runoff for the first time in the experimental period with rainfall intensity of 21.20 mm/h. Highest rainfall intensity which caused runoff was observed on 14th October (32.53 mm/h) with rainfall of 60 mm. Among different treatments, the treatment with higher canopy cover T3 (Groundnut) resulted in lesser per cent runoff (13.38 m3), soil loss (959.96 Kg/ha), nutrient loss (N-15.41 Kg/ha, P- 0.64 Kg/ha, K- 1.90 Kg/ha). and substantially higher average moisture content was recorded at 0-15 cm and 15-30 cm depth (16.46 and 22.67 % respectively) and exhibited lower particle density, bulk density and higher porosity, water holding capacity, rapid infiltration rate and better crop growth attributes resulted in higher grain yield (3132.81 kg/ha), and B:C ratio of 2.6 as compared to other treatments which have lesser canopy cover (T1 Field bean, T2 Cowpea, T4 Control, T5 Green gram and T6 Finger millet). Lower Crop management factor (C) was observed in groundnut plot 0.04 followed by finger millet (0.11) indicating good gross cover and erosion resistance. Overall groundnut and finger millet crop having higher crop canopy and extensive root system are realized as the best crops which can be grown in dry zone with greater the ability to protect the soil from erosion.
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DEVELOPMENT OF CROP MANAGEMENT FACTOR, UNIVERSAL SOIL LOSS EQUATION MODEL IN DIFFEREN