Characterization of soil phosphate status, sorption and saturation in paddy wetlands in usangu basin-Tanzania

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dc.creatorMng’ong’o, Marco
dc.creatorMunishi, Linus
dc.creatorBlake, William
dc.creatorNdakidemi, Patrick
dc.creatorComber, Sean
dc.creatorHutchinson, Thomas
dc.date2021-07-22T08:20:23Z
dc.date2021-07-22T08:20:23Z
dc.date2021-09
dc.date.accessioned2022-10-25T09:20:33Z
dc.date.available2022-10-25T09:20:33Z
dc.descriptionThis research article published by Elsevier Ltd., 2021
dc.descriptionPhosphorus (P) is a vital plant macronutrient required for plant growth which usually available in limited amount. P availability for plant uptake in highly weathered soil is controlled by soil erosion and high fixation. The availability of P applied from fertilizers depend on the soil pH, soil sorption capacity (PSC) and P saturation status (PSD), which determines P storage, losses, fixation, and additional P to be added with minimal loss to the environment. PSC and PSD are agroenvironmental indicators used to estimate P availability and P loss to the environment. However, PSC and PSD of agricultural soils had been never studied in Tanzanian soils. This study was conducted to assess and estimate P availability, PSC and PSD and the risks of P losses in tropical soils from Usangu basin popular for paddy farming. In total, 198 soil samples from 10 paddy irrigation schemes were collected (November–December 2019) and analyzed for inherent P (PM3), metal oxides of Aluminium (Al M3), iron (Fe M3), and calcium (Ca M3) as main PSC and PSD determinant. The determined concentrations were in range of; P M3 014.9–974.69 mg/kg, Al M3 234.56–3789.36 mg/kg, Fe M3 456.78–2980.23 mg/kg, and Ca M3 234.67–973.34 mg/kg. Estimated PSCM3 ranged 5.62–34.85 mmol/kg with a mean value of 14.14 mmol/kg corresponding to high status, ensuring high P holding capacity for plant uptake. However, some soils had very low PSCM3 creating a risk of P loss to environment. Among soils, the estimated PSD M3 ranged from 0.01 to 17.57% and was below (<24%), indicating low P loss risks to surface and groundwater, however, some soils were observed to have PSDM3 above 15% which correspond to a critical degree of phosphate saturation of 25% in a watershed using oxalate extraction method. Therefore some sites were associated with high P loss to the environment, immediate and precautionary actions for sustainable P management to increase productivity, environmental safety and sustainability are needed to be in place.
dc.formatapplication/pdf
dc.identifierhttps://doi.org/10.1016/j.chemosphere.2021.130466
dc.identifierhttp://dspace.nm-aist.ac.tz/handle/20.500.12479/1259
dc.identifier.urihttp://hdl.handle.net/123456789/95033
dc.languageen
dc.publisherElsevier Ltd.
dc.rightsAn error occurred on the license name.
dc.rightsAn error occurred getting the license - uri.
dc.subjectAgro-environmental
dc.subjectEutrophication
dc.subjectPhosphate loss
dc.subjectSorption capacity
dc.subjectPhosphate saturation degree
dc.titleCharacterization of soil phosphate status, sorption and saturation in paddy wetlands in usangu basin-Tanzania
dc.typeArticle

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