EFFECT OF CONSERVATION TILLAGE AND NUTRIENT MANAGEMENT PRACTICES ON FINGER MILLET IN ALFISOLS UNDER RAINFED CONDITIONS
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Date
2016-07-21
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A field experiment was conducted at AICRP for Dryland Agriculture, GKVK, University of Agricultural Sciences, Bengaluru during kharif2014 and 2015 on red sandy clay loam soil with low soil available N, K20 and medium P205 to study the effect of conservation tillage and nutrient management practices on finger millet. The experiment was laid out in split plot design with three main plots on different tillage treatments and five sub plots of different nutrient management practices replicated thrice. Among different tillage practices, conventional tillage (2 ploughings + 1 harrowing + 2 intercultivations at 25 and 50 DAS) with sown finger millet has recorded significantly higher growth attributes resulting in significantly higher grain yield (3041 kg ha-1), straw yield (4687 kg ha-1), net returns 54082 ha-') and B:C ratio (3.77) apart from higher nutrient, rain water and energy use efficiencies (58.12, 52.38 kg kg-1 N, 82.67, 74.41 kg kg-' P205 and 103.94, 93.81 kg kt1 K20, during 2014 and 2015, 4.78 kg ha-mm-' and 16.38, respectively) as compared to minimum and zero tillage practices. Among different nutrient management practices, 100 % recommended NPK (50:40:25 kg NPK ha-1) + 7.5 t FYM ha-1 recorded significantly higher growth attributes resulting in significantly higher grain yield (3030 kg ha-1), straw yield (4685 kg ha-1), net returns 50228 ha-1), B:C ratio (3.14) and rain water use efficiency (4.76 kg ha-mm-1) apart from improvement in soil physical properties [higher infiltration rate (16.11 cm h(1), cumulative infiltration (37.12 cm), maximum water holding capacity, lower bulk density and soil penetration resistance)], chemical properties [higher organic carbon (0.60 %)] and biological properties [higher population of bacteria (55.86 x 105 CFU g soir\ fungi (31.65 x 104 CFU g soir1), actinomycetes (18.35 x 103 CFU g soir1), microbial biomass carbon (572.0 µg g soir1), microbial biomass nitrogen (66.7 µg g soir1), urease (34.23 µg NH4-N g soir 1 h(1), dehydrogenase (179.56 µg TPF g soir1 24 h(1), acid phosphatase (37.91 g PNP g soir1) and alkaline phosphatase (36.58 g PNP g soir') activity] as compared to other nutrient management practices.
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