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		<doi>10.1007/s10661-017-5787-8</doi>
		<issn>0167-6369</issn>
		<citationkey>TrabaquiniGalvFormArag:2017:SoLaUs</citationkey>
		<title>Soil, land use time, and sustainable intensification of agriculture in the Brazilian Cerrado region</title>
		<year>2017</year>
		<month>Feb.</month>
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		<author>Trabaquini, Kleber,</author>
		<author>Galvão, Lênio Soares,</author>
		<author>Formaggio, Antonio Roberto,</author>
		<author>Aragão, Luiz Eduardo Oliveira e Cruz de,</author>
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		<group>DIDSR-CGOBT-INPE-MCTIC-GOV-BR</group>
		<affiliation>Epagri</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<electronicmailaddress>klebertrabaquini@epagri.sc.gov.br</electronicmailaddress>
		<electronicmailaddress>lenio.galvao@inpe.br</electronicmailaddress>
		<electronicmailaddress>antonio.formaggio@inpe.br</electronicmailaddress>
		<electronicmailaddress>luiz.aragao@inpe.br</electronicmailaddress>
		<journal>Environmental Monitoring and Assessment</journal>
		<volume>189</volume>
		<number>2</number>
		<pages>70</pages>
		<secondarymark>A1_INTERDISCIPLINAR A1_ENGENHARIAS_I A1_CIÊNCIAS_AMBIENTAIS A2_ZOOTECNIA_/_RECURSOS_PESQUEIROS A2_GEOGRAFIA B1_SAÚDE_COLETIVA B1_GEOCIÊNCIAS B1_ENGENHARIAS_III B1_ENGENHARIAS_II B1_CIÊNCIAS_AGRÁRIAS_I B1_CIÊNCIA_DE_ALIMENTOS B1_BIODIVERSIDADE B2_NUTRIÇÃO B2_FARMÁCIA B2_EDUCAÇÃO B2_CIÊNCIAS_BIOLÓGICAS_II B2_CIÊNCIA_DA_COMPUTAÇÃO B2_BIOTECNOLOGIA B3_QUÍMICA B3_MATERIAIS B3_ENSINO B3_EDUCAÇÃO_FÍSICA B3_CIÊNCIAS_BIOLÓGICAS_III B3_CIÊNCIAS_BIOLÓGICAS_I</secondarymark>
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		<keywords>Agriculture, Cerrado, Food security, Land use change, Remote sensing, Soil nutrients.</keywords>
		<abstract>The Brazilian Cerrado area is in rapid decline because of the expansion of modern agriculture. In this study, we used extensive field data and a 30-year chronosequence of Landsat images (19802010) to assess the effects of time since conversion of Cerrado into agriculture upon soil chemical attributes and soybean/corn yield in the Alto do Rio Verde watershed. We determined the rates of vegetation conversion into agriculture, the agricultural land use time since conversion, and the temporal changes in topsoil (020 cm soil depth) and subsurface (2040 cm) chemical attributes of the soils. In addition, we investigated possible associations between fertilization/over-fertilization and land use history detected from the satellites. The results showed that 61.8% of the native vegetation in the Alto do Rio Verde watershed was already converted into agriculture with 31% of soils being used in agriculture for more than 30 years. While other fertilizers in cultivated soils (e.g., Ca+2, Mg+2, and P) have been compensated over time by soil management practices to keep crop yield high, large reductions in Corg (38%) and Ntot (29%) were observed in old cultivated areas. Furthermore, soybean and cornfields having more than 10 years of farming presented higher values of P and Mg+2 than the ideal levels necessary for plant development. Therefore, increased risks of over-fertilization of the soils and environmental contamination with these macronutrients were associated with soybean and cornfields having more than 10 years of farming, especially those with more than 30 years of agricultural land use.</abstract>
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		<language>en</language>
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