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ThesisItem Open Access Effect of varying levels of boron and sulphur on yields and nutrient uptake of linseed and sunflower grown in a mollisol(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-12) Bungla, Prerna; Pachauri, S.P.The laboratory and greenhouse experiments were conducted in the micro-nutrient Laboratory and net house of Department of soil science, College of agriculture, GBPUAT, Pantnagar in the year of 2018-2019 to study the leaching behavior of B and S in the presence of either nutrient in soils of varying textures. In pot culture experiment, the effect of B and S application on yields, nutrient concentration and uptake of B and S by linseed and a residual crop of sunflower. Two soils of different textures i.e. sandy loam and clay loam were collected from different depths (0-15, 15-30, 30-45, 45-60 and 60-90 cm) in NBCRC, Pantnagar. These soil samples were packed depth-wise in plastic pipes of 1 inch diameter and 110 cm length. All columns were packed with slightly moist soil at natural bulk density. The lower most pipe was covered with a perforated polythene sheet tied with tight rubber band. Boron and S sources were added as borax and ammonium sulphate (2 mg B kg-1 and 60 mg S kg-1) to the uppermost layer of soil. Soil columns were subjected to 6 cm irrigation at specified time intervals. Boron and sulphur were analyzed in the percolated water samples every 24 h until leaching stopped. Relatively higher amounts of B were lost from the sandy loam soil than clay loam soil and S application delayed the leaching loss of B in sandy loam soil. The kinetics of B and S losses in both the soil could be satisfactorily accounted by a first order kinetics. Pot culture experiment was laid out in a factorial completely randomized design with combinations of six levels of boron (0, 0.5, 1.0, 1.5, 2.0 mg B kg-1 soil and 2 foliar sprays of 0.2% borax at 30 and 45 DAS) and six levels of sulphur (0, 10, 20, 30, 40 and 60 mg S kg-1 soil) with three replications. Linseed (cv. Neelum) and a residual crop of sunflower (cv. Shresta) were taken as test crops and all the treatments were basally applied to linseed only. Two foliar sprays of 0.2% borax were done in sunflower crop at 30 and 45 DAS. The highest total dry matter (6.45 g pot-1), seed yield (2.30 g pot-1), stover yield (4.16 g pot-1), S concentration, B uptake and S uptake was observed under a treatment combination receiving 2 mg B and 60 mg S kg-1 soil. The highest B concentration in seeds and stover of linseed was observed under a treatment combination receiving foliar spray of B and 60 mg S kg-1 soil. The highest total dry matter (48.81 g pot-1), seed yield (13.69 g pot-1) and stover yield of sunflower (35.12 g pot-1) was recorded under a treatment combination receiving 2 mg B and 60 mg S kg-1 soil applied to linseed crop. The highest B concentration in seeds and stover and highest concentration of S in stover of sunflower was noted under a treatment combination receiving foliar spray of B in sunflower and 60 mg S kg-1 soil applied to linseed crop. The highest B uptake of sunflower was recorded under a treatment combination receiving two foliar sprays of 0.2% borax and 60 mg S kg-1 soil applied to linseed crop. The highest S uptake by sunflower was observed under a treatment combination receiving 2 mg B and 40 mg S kg-1 soil applied to linseed crop.
