RESOURCE INVENTORIZATION FORWATERSHED PLANNING OF HUMNABAD SUB-WATERSHED OF HUMNABAD TALUK IN BIDAR DISTRICT
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Date
2018-07
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University of Horticultural Sciences, Bagalkot (COLLEGE OF HORTICULTURE, BENGALURU)
Abstract
A study was undertaken to characterize and map the soils under Humnabad sub-watershed in North Eastern Transitional Zone (Zone- 1) of the Karnataka in order to assess their resource potential i.e., land capability, suitability for different crops, resource conservation plans and also to assess soil productivity constraints of the area. Eighteen representative soil series were studied in detail. The soil were described in the field for their morphological properties and later analyzed in laboratory for their physical and chemical properties and further classified up to series level. The identified land capability sub-classes namely; IIse, IIwe, IIIse and IVse have been differentiated and mapped. Based on the Land Capability Classification (LCC) conservation measures were recommend like crescent bund, trench cum bunding, bench terracing etc., for shallow soils with severe erosion and undulating topography. Whereas, for more deep to very deep soils, clayey in texture and prone to slight to moderate erosion graded bunds or strengthening of bund were recommended. The mapped soils from the study area were matched with the soil suitability criteria for few important crops like pigeonpea, soybean, mango, guava, sapota and cashewnut. According to different soil series some of them were not suitable, highly suitable, marginally suitable, and moderately suitable due to the limitations of rooting depth, texture and slope. Surface samples (464) were collected from at a grid interval of 320 m and analyzed for fertility status. The soil pH content was neutral to moderately alkaline in reaction and non-saline in nature. Soil organic content was low to high. Available nitrogen, phosphorous and sulphur were low to medium. All micronutrients were sufficient except zinc.