Effect of organic amendments on boron availability in calcareous soils under raya (Brassica juncea L.) and soybean (Glycine max.L.)

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dc.contributor.advisorSharma, Sandeep
dc.contributor.authorSukhvir Kaur
dc.date.accessioned2020-02-10T04:40:16Z
dc.date.available2020-02-10T04:40:16Z
dc.date.issued2019
dc.description.abstractA pot experiment was conducted during rabi (2016-2017) and kharif (2017) season to study the response of raya (Brassica juncea L.) (cv. PBR 357) and soybean (Glycine max L.) (cv. SL 958) to different levels of boron (B) and different organic manures in boron deficient calcareous soils of Punjab. Three different soils with varying calcium carbonate content viz. 0.65 (soil I), 4.1 (soil II) and 5.4 per cent (soil III) were collected from Ludhiana, Sudhar (Ludhiana) and Bathinda Districts for experimental study. The treatments comprised six levels of boron for soil application viz. 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mg B kg-1 and two levels of farmyard manure viz. control and FYM @10 t ha-1. The experiment was laid out in CRD factorial design with three replications. Yield and yield attributing characters at different crop growth stages (grand growth and maturity stage) increased significantly at 1.5 mg B kg-1 with FYM irrespective of the soils. The boron content and its uptake was higher in leaves followed by stem, grains and root, respectively both in raya and soybean crop. Among calcareous soils, soil I with lowest calcium carbonate was the best soil in respect of yield, yield components, boron content and its uptake in comparison to soil with medium and high calcium carbonate content. Boron transformation in soil after the harvesting of raya and soybean crop revealed that readily soluble was higher in soil I compared with soil II and soil III. Specifically adsorbed, oxide bound, residual and total boron were more in soil III however, oxide and organically bound fractions were higher in soil II. The coefficient of determinations (R2) for Langmuir adsorption isotherm were lower compared with Freundlich adsorption isotherm which proved that Freundlich adsorption isotherm to be more valid for adsorption studies. It indicated that B adsorption data fits excellent to Freundlich adsorption isotherm. The highest value of adsorption maxima (b) (45.0 mg kg-1) was recorded in silty clay. However, the highest bonding energy constant (k) (0.111 L kg-1) value was recorded in sandy soil whereas; the (k) lowest value 0.047 mg L-1 was recorded in silty clay. The Freundlich bonding energy constant increased with increase in soil clay content having minimum value in sandy soil 1.405 mg kg-1 and maximum (2.29 mg kg-1) in silty clay soil. In incubation study, the availability of boron in soil was studied with six varying levels of boron (0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mg B kg-1), five organic amendments (control, farmyard manure, press mud, poultry manure and rice straw compost) with three levels of calcium carbonate content (0.64, 4.1 and 5.4 per cent) at 15, 30 and 60 days of intervals. The soil was incubated in a temperature controlled room at 25oC. Boron availability increased as a function of time and treatment for different soils. The mean boron content was highest in soil application of 2.5 mg B kg-1 with farmyard manure followed by press mud, poultry manure, rice straw and control (no-amendment) in different types of soils. Availability of boron was highest in soil with low calcium carbonate content and decreased with increasing levels of calcium carbonate content over time period.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810142740
dc.keywordsAdsorption, boron, calcium carbonate, fraction, Freundlich, Langmuir, raya, soybeanen_US
dc.language.isoenen_US
dc.pages249en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemEffect of organic amendments on boron availability in calcareous soils under raya (Brassica juncea L.) and soybean (Glycine max.L.)en_US
dc.subSoil Scienceen_US
dc.themeEffect of organic amendments on boron availability in calcareous soils under raya (Brassica juncea L.) and soybean (Glycine max.L.)en_US
dc.these.typePh.Den_US
dc.titleEffect of organic amendments on boron availability in calcareous soils under raya (Brassica juncea L.) and soybean (Glycine max.L.)en_US
dc.typeThesisen_US
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