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 K.
dc.creatorBlake, William
dc.creatorNdakidemi, Patrick A.
dc.creatorComber, Sean
dc.creatorHutchinson, Thomas H.
dc.date2021-05-03T07:51:41Z
dc.date2021-05-03T07:51:41Z
dc.date2021-04-02
dc.date.accessioned2022-10-25T09:20:27Z
dc.date.available2022-10-25T09:20:27Z
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 agro-environmental 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 (P), metal oxides of Aluminium (Al ), iron (Fe ), and calcium (Ca ) as main PSC and PSD determinant. The determined concentrations were in range of; P 014.9-974.69 mg/kg, Al 234.56-3789.36 mg/kg, Fe 456.78-2980.23 mg/kg, and Ca 234.67-973.34 mg/kg. Estimated PSC 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 PSC creating a risk of P loss to environment. Among soils, the estimated PSD 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 PSD 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.
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dc.identifierhttps://dspace.nm-aist.ac.tz/handle/20.500.12479/1158
dc.identifier.urihttp://hdl.handle.net/123456789/94957
dc.languageen
dc.subjectAgro-environmental
dc.subjectEutrophication
dc.subjectMehlich 3
dc.subjectPhosphate loss
dc.subjectPhosphate saturation degree
dc.subjectSorption capacity
dc.titleCharacterization of soil phosphate status, sorption and saturation in paddy wetlands in usangu basin-Tanzania.
dc.typeArticle

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