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dc.contributor.authorVOLF, M.pt_BR
dc.contributor.authorBENITES, V. de M.pt_BR
dc.contributor.authorROSOLEM, A. C.pt_BR
dc.contributor.authorCRUSCIOL, A. C.pt_BR
dc.contributor.authorMORAES, F. M.pt_BR
dc.contributor.authorMENEZES, F. J.pt_BR
dc.contributor.authorSILVA, C. A.pt_BR
dc.date.accessioned2017-05-15T11:11:11Zpt_BR
dc.date.available2017-05-15T11:11:11Zpt_BR
dc.date.created2017-05-15pt_BR
dc.date.issued2017pt_BR
dc.identifier.citationIn: FRONTIERS OF POTASSIUM SCIENCE CONFERENCE, 2017, Rome. Proceedings... Peachtree Corners: International Plant Nutrition Institute, 2017. Ref. P185-P193.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1069571pt_BR
dc.descriptionThe original soil exchangeable potassium (K) concentrations are at or above critical levels in many Brazilian Cerrado (savanna) soils. Hence, many cropped areas have been fertilized with low K rates, below crop requirements, but yields have not decreased as expected. In these areas, topsoil exchangeable K analyses have shown no decrease, or even some increase. The aim of this study was to evaluate exchangeable and non-exchangeable K forms in soils under different uses and managements in the Vale do Araguaia region of Mato Grosso state, Brazil. Soil samples were taken from 91 sites at depths of 0-20 cm and 20-40 cm, in areas under grain crops, pasture and native vegetation (Cerrado or forest). Silt content ranged from 12 to 175 g kg-1 and clay from 90 to 595 g kg-1, and the predominant clays were kaolinite, hematite, goethite and gibbsite. Under pasture, the soils had high levels of exchangeable K in the 0-20 cm layer and high levels of non-exchangeable K from 20 to 40 cm. This can be a result of the absorption of non-exchangeable K by grasses, the main cultivated species, by recycling K to the exchangeable fraction in the topsoil. There was a positive relationship between silt and non-exchangeable K contents. Ratios of exchangeable to non-exchangeable K were over 3 in soils with silt above 70 g kg-1, in which non-exchangeable K was over 100 mg dm-3. Cover crops growing in soils rich in silt take up non-exchangeable K and exchangeable K from deeper layers, which is recycled to the soil as exchangeable K upon plant residue mineralization, which may have been responsible for the maintenance or increase in exchangeable K levels in the 0-20 cm layer in areas where low K rates have been used for grain production.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectVale do Araguaiapt_BR
dc.titleSilt as K source for crops in tropical soils.pt_BR
dc.typeArtigo em anais e proceedingspt_BR
dc.date.updated2017-06-02T11:11:11Zpt_BR
dc.subject.thesagroSolopt_BR
dc.subject.thesagroCerradopt_BR
riaa.ainfo.id1069571pt_BR
riaa.ainfo.lastupdate2017-06-02pt_BR
dc.contributor.institutionMARCELO RAPHAEL VOLF, UNESP; VINICIUS DE MELO BENITES, CNPS; CIRO ANTONIO ROSOLEM, UNESP; CARLOS ALEXANDRE COSTA CRUSCIOL, UNESP; MILTON F. MORAES, UFMT; JUNE FARIA SCHERRER MENEZES, UNIRV; ANA C. SILVA, DALCIN LABORATORY OF SOIL AND PLANT.pt_BR
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