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ThesisItem Open Access Optimization of fibre flax production technology through agronomic management(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-07) Dey, Prithwiraj; Mahapatra, B.S.A field experiment was conducted during rabi season of 2019-20 and 2020-21 in E-5 block of the N.E.B.C.R.C. of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) with objectives to optimize seed rate, nutrient doses and harvesting time for fibre flax based on growth, yield, quality and profitability parameters, to find out the extent of lodging and assess the effectiveness of different treatments for the reduction of lodging, to find out the optimum water retting duration for fibre flax and to correlate several growth, yield and quality parameters of fibre flax to uncover the existing interrelations. The soil on the experimental site was sandy loam, neutral in pH with medium organic carbon (0.71%), low available nitrogen (196.9 kg/ha), medium available phosphorus (21.9 kg/ha) and potassium (210.1 kg/ha). The experiment was laid out in a split-plot design with three replications consisting of three levels of main plot factor (seed rate of 60, 80 and 100 kg/ha) and six levels of sub-plot factor (0:30:30, 60:30:30, 90:30:30, 120:30:30, 90:30:45 and 120:30:45 kg/ha N:P2O5:K2O). Time of harvest was taken as an additional factor with two levels (harvesting at 110 DAS and 135 DAS). Another side-by-side experiment was conducted in a completely randomized design with seven treatments (unretted, 1, 2, 4, 6, 8, 10 days retting duration) to find out the optimum retting duration of fibre flax. Use of 100 kg/ha seed rate resulted in about 27.9 and 26.1% higher scutched fibre yield than a seed rate of 60 kg/ha when harvested at 110 DAS and 135 DAS, respectively. Among the nutrient management levels, application of 90:30:45 kg/ha N:P2O5:K2O was found to have at par fibre yields with the best performing treatment. Late harvest at 135 DAS was recorded to have an 18.2% higher total fibre yield than early harvest. However, late harvest resulted in a significant decrement in the fibre quality and about 22.4% decrement in the superior quality heckled long fibre yield than early harvest. Long fibre yield, otherwise, was found to follow similar trends with the scutched fibre yield. Lodging in crop increased with the increasing seed rate, nitrogen dose and delay in harvest. However, the supply of additional potassium can mitigate lodging problems even in high seed rate conditions when harvested at 110 DAS. Several parameters such as plant height, long fibre yield, breaking tenacity, cellulose content was found to be positively correlated with the final plant population. Lodging in flax was positively correlated with nitrogen uptake and plant populations and negatively correlated with the potassium uptake and basal stem diameter. Potassium was found to increase the yield and quality of the fibre while reducing the occurrence of lodging through secondary stem strengthening. Based on the current study, a seed rate of 100 kg/ha and the application of 90:30:45 kg/ha N:P2O5:K2O were found optimum with respect to the growth attributes, fibre yield, quality and profitability for fibre flax cultivation. Harvesting at 110 DAS was found to result in a 23.7% more net returns on an average than late harvesting of the crop. Such treatments were also found to have positive or near positive available nitrogen, phosphorus and potassium balance in the soil after harvesting of the crop. Among the durations of water retting, 4-6 days retting duration was found to be optimum with respect to fibre quality parameters.
