Abstract
Attempt has been made to study the physiological response of soybean in terms of photosynthetic rate, CO2 concentration, stomatal conductance, transpiration rate, stomatal resistance, leaf temperature and absorbed photosynthetically active radiation as influenced by integrated nutrient management practices. The experiment on soybean crop was conducted at Rahuri, Dist. Ahmednagar (MS) during Kharif season of 2014-15 and 2015-16 with treatments comprising of different doses of N supplied through FYM, vermicompost and neem cake.Results indicated that the photosynthetic rate, stomatal conductance, transpiration rate and absorbed photosynthetically active radiation varied significantly due to treatments as well as with stage of the crop. These parameters were highest under chemical fertilizer treatment but at par with treatments having 50 per cent N through FYM and VC. The lowest values were observed in treatments having neem cakes application. Among the three dates of observation, these parameters were highest at 56 DAS. Leaf temperature was not affected by the treatments.
Highlights
Among the oilseed crops grown in India, soybean is an important pulse and occupied fourth place in edible oil contributing 43 per cent to the total oilseeds and 25 per cent to the total oil production in the country.Maharashtra and Madhya Pradesh together contribute to 89 per cent of the total soybean production in India
The treatments were applied to kharif soybean comprised of five sources viz., T - 100 % recommended dose of fertilizer (RDF), T2- 50 % recommended dose of nitrogen (RDN) through chemical fertilizer (CF) + 50 % recommended dose of nitrogen (RDN) through farmyard manure (FYM), T - 50
0.22 (RDN) through neem cake (NC).The micrometeorological observations viz., air temperature, leaf temperature and physiological parameters viz., rate of photosynthesis, stomatal conductance and transpiration were measured with the help of portable Infra Red Gas Analyzer (IRGA) Li-Cor make photosynthesis system: LI-COR 6400 (Li-Cor, Lincoln, NE, USA) at an interval of 28 days after sowing (DAS)
Summary
The experiment was laid out in simple randomized block design with three replications. The treatments were applied to kharif soybean comprised of five sources viz., T - 100 % recommended dose of fertilizer (RDF), T2- 50 % recommended dose of nitrogen (RDN) through chemical fertilizer (CF) + 50 % recommended dose of nitrogen (RDN) through farmyard manure (FYM), T - 50. % recommended dose of nitrogen (RDN) through chemical fertilizer (CF) + 50 % recommended dose of nitrogen (RDN) through vermicompost (VC), T4- 50 % recommended dose of nitrogen (RDN) through chemical fertilizer (CF) + 50 % recommended dose of nitrogen (RDN) through neem cake (NC), T5- 25 % recommended dose of nitrogen (RDN) through chemical fertilizers (CF) + 25 % recommended dose of nitrogen (RDN) through farmyard manure (FYM) + 25 % recommended dose of nitrogen (RDN) through vermicompost (VC) + 25 % recommended dose of nitrogen
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