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Paper Details

Canopy temperature (CT), stress degree days (SDD) as influenced by treatments and varieties in soybean


Journal Title:International Journal of Agricultural Sciences

The experiment was laid out in Split Plot Design with three replications and two factors viz., date of sowing D1 (MW-27), D2 (MW- 28), D3 (MW-29) and D4 (MW-30) and cultivars V1 (MAUS-47), V2 (MAUS-71), V3 (MAUS-81), V4 (MAUS-158), V5 (JS-9305) and V6 (JS- 335) to find out the optimum sowing time for soybean genotypes. Experiment was carried out at research farm of Department of Agricultural Meteorology, Parbhani The canopy temperature designates the plant water stress. If the canopy temperature of soybean crop is greater, then soil moisture stress occurred in the field. Canopy temperature is one of the most reliable indicators of the crop water stress due to its direct relation with the plant water status. The highest mean canopy temperature (32.00C) and (32.10C) were observed in D4 (MW-30) date of sowing and genotype V1 (MAUS-47), respectively whereas stage P10 (maturity stage) indicated the highest mean canopy temperature 32.40C. The lowest mean canopy temperature (30.90C) and (30.70C) were recorded in D1 (MW-27) date of sowing and genotype V4 (MAUS-158), respectively. Whereas stage P1 (emergence stage) indicated the lowest mean canopy temperature i.e. 30.300C. The variety growth characters like emergence and final plant count, plant height, number of functional leaves, number of branches, number of pods, mean leaf area, leaf area index, dry matter, weight of pods per plant, weight of grain per plant, 1000 seed weight (test weight), grain yield, straw yield and biological yield were observed maximum in D1 (MW-27) date of sowing and in cultivar V4 (MAUS-158). Whereas, minimum observed in D4 (MW-30) date of sowing and cultivar V1 (MAUS-47).