Effect of Sowing Environments on Growth, Productivity and Agrometeorological Indices of Gobhi sarson (Brassica napus L.) Cultivars under Sub-tropics of Jammu
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Date
2020-11
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Sher-e-Kashmir University of Agricultural Sciences and Technology Jammu, J&K
Abstract
An experiment entitled, “Effect of Sowing Environments on Growth, Productivity and Agrometeorological Indices of Gobhi sarson (Brassica napus L.) Cultivars under Sub-tropics of Jammu” was conducted at the research farm of Agrometeorology Section, Division of Agronomy of Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Chatha during the Rabi, 2018-19. The experiment was laid out in Factorial Randomized Block Design with three sowing environments (20th October, 30th October and 9th November) along with three cultivars (GSL-1, ONK-1 and DGS-1) and replicated thrice. The soil of the experimental field was sandy clay loam in texture, slightly alkaline in reaction (7.60 pH), low in organic carbon (0.41 %) and available nitrogen (219.50 kg/ha) but medium in available potassium (132.46 kg/ha) and available phosphorous (14.00 kg/ha) with EC (0.15 ds/m). The experimental results revealed that the Gobhi sarson crop sown on 20th October recorded significantly highest growth parameters and yield attributes viz., plant height, leaf area index, dry matter accumulation, number of primary (5.17) & secondary branches/plant (12.91), siliquae/plant (160.18) and seeds/siliqua (19.22) in comparison to the crop sown on 30th October and 9th November. With the result (Source sink relationship), significantly highest seed yield was found under 20th October (1774 kg/ha) sown crop, while, significant reduction to an extent of 29.86 and 60.68 per cent were recorded with delayed sowing of 30th October (1366 kg/ha) and 9th November (1101 kg/ha). However, non-significant difference was observed with respect to number of plants/m2, test weight and harvest index. The cultivar GSL-1 recorded significantly higher plant height, LAI, dry matter, primary and secondary branches/plant, siliquae/plant, seeds/siliqua followed by ONK-1 and DGS-1 resulting in significantly higher yield of GSL-1 (1519 kg/ha) over DGS-1 (1269 kg/ha) but at par with ONK-1 (1457 kg/ha). The crop sown on 20th October took less number of days for the completion of vegetative phenophases (69 days) whereas more number of days for attaining physiological maturity (164 days) as compared to 30th October (158 days) and 9th November (153 days) sown crop. The agrometeorological indices viz., growing degree days, photo thermal units, helio thermal unit, pheno thermal index, heat use efficiency and radiation use efficiency were significantly highest under 20th October sowing and decreased with delay in sowing. The flower bud initiation and most seed green stage were found to be the most sensitive stage with respect to various weather parameters which positively and negatively influenced the yield and yield attributes. The B:C ratio was calculated higher in 20th October (2.06) sown crop as compared to 30th October (1.36) and 9th November (0.85) sown crop whereas GSL-1 cultivar recorded higher B:C ratio (1.60) followed by ONK-1 (1.49) and DGS-1 (1.19). But, ONK-1 performed better than GSL-1 and DGS-1 under delayed sowing done on 09th November.
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Preferred for your work. Bhagat, R. 2020. Effect of Sowing Environments on Growth, Productivity and Agrometeorological Indices of Gobhisarson (Brassica napus L.) Cultivars under Sub-tropics of Jammu.M.Sc. thesis, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, India.