Vol. 12, Issue 8 (2023)

Author(s):
HC Kalita, P Dutta and SK Baishya

Abstract:
To investigate the impact of sowing dates and fertility management on the rapeseed varieties TS-46 and TS-38 under rainfed conditions, a field experiment was conducted at the ICAR-KVK, Goalpara for two seasons (Rabi 2020-21 and 2021-22). The experiment included three sets of treatments, including four planting dates, two variety types, and three fertility doses. The treatments were arranged in a split-plot design, with three replications placing the sowing date in the main plot. The sandy loam soil at the experimental site contained low amounts of available total phosphorus and potassium and an acidic p^H, but medium levels of available total nitrogen and organic carbon. Results showed that for every 10 days of delayed sowing at the crop, the seed and stover yield and seed oil content declined considerably. The crop that was sowed on November 10, the highest seed yield of 8.65 qha^-1 and stover output of 36.58 qha-¹ were recorded. Further, each 10 day delay in planting caused a considerable reduction in the seed oil content. In terms of seed yield, the variety TS-46 was superior to the variety TS-38. Gypsum application at 133 kg ha^-1 along with N, P₂O₅, and K₂O application at 40, 35, and 15 kg ha^-1 each enhanced the seed and stover production as well as the seed oil content. Gypsum at 133 kg ha^-1and borax at 1.1kg ha^-1 application further enhanced the yield of seeds (8.64qha^-1), stover (30.70 qha^-1) and seed oil (39.86%).