Browsing by Author "VIJAY KUMAR, C."
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ThesisItem Open Access CHARACTERIZATION OF SALT AFFECTED SOILS IN SELECTED LOCATIONS OF CAUVERY COMMAND AREA AND STUDIES ON EFFECT OF NUTRIENT LEVELS AND RATIOS ON GROWTH AND YIELD OF RICE IN GYPSUM AMENDED SODIC SOIL(University of Agricultural Sciences GKVK, Bangalore, 2015-04-10) VIJAY KUMAR, C.; PRAKASH, S. S.Survey of salt affected soils in four selected locations of Cauvery Command Area indicated that soils are sandy clay loam to clay in texture, slightly acidic to alkaline in reaction (pH 6.2-10.6) with ECe in the range between 0.4 and 11.7dS/m. Soils were low to medium in organic carbon, N, P, K, Ca, Mg, S and micronutrients (Zn, Cu, Fe, Mn and B). Profile studies showed that soil pH, organic carbon and available N decreased with depth. Sodium was the most dominant cation and the ESP of the soils ranged from 1.1 to 58.6. The lowlands have higher sodium and ESP than uplands. The per cent samples falling under salinity and alkalinity or both were 71, 72, 65 and 83 in site 1, 2, 3 and 4, respectively. Field experiments were conducted at ZARS, V. C. Farm, Mandya during Kharif 2013 and summer 2014 to assess the growth and yield response of rice to nutrient levels and ratios in gypsum amended sodic soil. The experiment were laid out in a randomized complete block design with nineteen treatment combinations and replicated thrice. The results revealed that application of gypsum @ 100% GR and 150:50:50 kg NPK/ha (3:1:1) recorded significantly higher grain (5.37 t/ha) and straw (6.79 t/ha) yield of rice, nutrient content and uptake (129.5, 35.6 and 84.3 kg NPK ha-1) as compared to other nutrient levels and ratios. Further higher secondary and micronutrients content and uptake, nutrient use efficiency, higher gross and net monetary returns and higher B:C ratio (1.86) and decreased pH, ECe and ESP were recorded in the same treatment. The study clearly showed that in sodic soils, application of gypsum @ 100% GR and NPK (150:50:50 kg/ha) is more beneficial in enhancing the crop yield, crop productivity as well as soil fertility.ThesisItem Open Access EFFECT OF SOURCES AND TIME OF FERTILIZER APPLICATION ON UPTAKE, GROWTH AND YIELD OF POTATO UNDER RAINFED CONDITION IN HASSAN DISTRICT(University of Agricultural Sciences, Bangalore, 2010-07-15) VIJAY KUMAR, C.; PRAKASH, S. S.Field experiment was conducted during kharif 2009 at Agricultural College Farm, Karekere, Hassan on sandy loamy soil to study the effect of different sources and time of fertilizer application on uptake, growth and yield of potato under rainfed condition in Hassan District. The experiment was laid out in a randomized complete block design with four treatments replicated thrice. The potato tuber yield (16.50 t ha-1) with the application fertilizers as per the farmers practice (6 bags of 20:20:0:13 and 50 kg urea ha-1) and FYM @ 25 t ha-1 alone (10.92 t ha-1) was significantly lower than that obtained with application of RDF from different sources (N from urea or AS, P from SSP or DAP and K from MOP or SOP) and time of application (at planting or at 15 days after planting) along with FYM @ 25 t ha-1 (20.64 to 22.24 t ha-1). However, the highest tuber yield of 22.24 t ha-1 was obtained with the application of RDF through DAP, urea and SOP along with FYM @ 25 t ha-1 which was at par with the tuber yield recorded in other RDF treatments. The increase in yield due to application of RDF might be attributed to balanced supply of nutrients to the crop at appropriate time. The content and uptake of both macro and micronutrient in haulm and tuber increased with the application of RDF through different sources and their time of application as compared to that observed with farmers practice. The available nutrient status of both macro and micronutrients was increased in the soil after the harvest of the crop due to application of RDF from different fertilizer source along with FYM. Application of recommended dose of NPK from different fertilizer sources along with FYM resulted in higher gross returns and net returns compared to farmers practice. The highest benefit: cost ratio (2.55:1) was observed with the application of RDF through urea, SSP and MOP at planting when FYM cost was not included.