REVALIDATION OF N, P, K NUTRIENTS FOR SUMMER GROUNDNUT (Arachis hypogaea L.) IN RAICHUR DISTRICT

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Date
2013-08-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR
Abstract
A survey work was conducted in selected groundnut growing areas of Raichur district during rabi/summer 2011-12 in order to assess nutrient status of soils. The results revealed that soils were low in available nitrogen, low in available phosphorous and medium in available potassium and have sufficient quantity of available micronutrients. A field experiment was conducted at Kasabalingsugur, Lingsugur taluq to study the existing recommended level of N, P and K fertilizer in package of practice by comparing with STCR approach, STL method and increased level by 25 to 50 per cent N, P and K based on soil fertility category (LLM) and also modified STL method along with PSB on growth, yield, nutrient uptake and soil fertility status at harvest stage of groundnut using randomized complete block design with 6 treatments and 4 replications during rabi/summer 2011-12. The results indicated that STCR approach produced significantly more plant height, number of leaves per plant, number of primary branches per plant and total dry matter production, leaf area per plant, leaf area index, number of pods per plant, pod weight, 100-kernel weight, shelling percentage, pod yield, haulm yield, harvest index, oil content and oil yield (39.30 cm, 44.56, 10.53, 38.78 g plant-1 11.79 dm2, 0.393, 18.60, 14.95 g plant-1, 30.75 g, 74.25, 1810 kg ha-1 2615 kg ha-1, 0409, 46.18 % and 620.62 kg ha-1, respectively) at harvest stage as compared to RDF (35.26 cm, 37.70, 8.89, 33.01 g plant-1, 8.27 dm2, 0.275, 14.00, 13.00 g plant-1, 26.50 g, 68.52, 1512 kg ha-1, 2180 kg ha-1, 0.410, 46.11 % and 447.71 kg ha-1, respectively). The significantly higher nutrient uptake (80.28, 7.58, 47.33, 42.89, 24.84, 8.63 and 10.72 kg ha-1, respectively) and availability (255.41 kg ha-1, 18.89 kg ha-1, 232.58 kg ha-1, 17.12 [C mol (p+) kg ha-1], 8.00 [C mol (p+) kg ha-1], 7.29 mg kg-1 and 1.82 mg kg-1, respectively) of N, P, K, Ca, Mg, S and Zn, respectively was recorded with STCR approach as compared to the RDF and it was on par with soil test based NPK  25 %.
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