IMPACT OF RESOURCE CONSERVATION TECHNIQUES ON RUNOFF AND SEDIMENT YIELD IN LOWER SHIVALIKS OF JAMMU
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Date
2019-09
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Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu, Jammu
Abstract
A field study was conducted to study the impact of resource conservation techniques on runoff and sediment yield in lower shivaliks of Jammu. The value of pH in sandy loam was highest in overgrazing prevention (7.84) and lowest in cover crop (7.33) in both sandy and clayey soils. The organic carbon content was highest in cover crop in both sandy and clay loam soils i.e. (8.14g kg-1) and (8.25g kg-1) and lowest in overgrazing prevention (2.11g kg-1) and (2.37 g kg-1), respectively. The highest value of available nitrogen, phosphorus and potassium were recorded in cover crop in both sandy and clay loam soils i.e. (426.22 kg ha-1 and 440.10 kg ha-1) (28.52 kg ha-1 and 30.29 kg ha-1) & (292.04 kg ha-1and 309.70 kg ha-1), respectively. The quantification of nutrient loss revealed that total nitrogen, phosphorus & potassium loss was maximum in overgrazing prevention in both sandy and clay loam. The values were 24- 26 kg ha-1 yr-1 & 8.2–14.0 kg ha-1 yr-1 for nitrogen, 29.0 – 30.0 kg ha-1 yr-1 & 16.0 – 24.0 kg ha-1 yr- 1for phosphorus and 23.0 – 29.0 kg ha-1 yr-1 & 8.0 – 10.42 kg ha-1 yr-1 for potassium, respectively in both the soils. The minimum loss of total nitrogen, phosphorus & potassium were recorded in cover crop in both soils. Cover crop has the highest value of soil loss tolerance limit i.e. (7.3 Mg ha-1 yr-1) and (7.0 Mg ha-1 yr-1) in sandy loam and clay loam, respectively. The water yield (mm) was highest in overgrazing prevention i.e. (370 mm-Ist year and 292 mm-IInd year in sandy loam) and (350 mm-Ist year and 285 mm- IInd year in clay loam). Minimum value of water yield was recorded in cover crop i.e. 140 mm-Ist year and 92mm-IInd & 120 mm-Ist year and 64 mm-IInd in sandy and clayey soils, respectively. The study strongly recommended adoption of resource conservation techniques for reducing soil erosion, water conservation in submontane shivalik.
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