Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.

Detalhes bibliográficos
Ano de defesa: 2000
Autor(a) principal: COELHO, A. M.
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://www.alice.cnptia.embrapa.br/alice/handle/doc/484182
Resumo: Precision farming is important to development agricultural production systems and has created a need for spatial data on crop yield and soil characteristics. The objectives of this research were to identify: (i) the spatial and structural variation of soil properties across the landscape; (ii) how yields are related to these soil properties; and (iii) how information of spatial variability within soil physical, chemical, and biological properties can be used to asses in field soil degradation. On farm research was conducted on center-pivot-irrigated fields in Adams and Buffalo Counties, Nebraska, during 1997 and 1998. Samples were taken and analyzed soil physical, chemical, and biological properties, plant population, leaf tissue analysis for nutrients, and grain yields. Factor analysis, multivariate linear regressions, and geostatistics were used to explore soil and crop variability, and classify and map soil properties in the fields. On the farm field with a finer textured silty clay loam soil, soil variation was decomposed into five factors, which accounted for 75% of the total variance. Regression models based on these showed that soil fertility as related to available phosphorus and manganese, as associated with organic matter, was associated with 73% of corn yield variability. However, the application of Mn and P fertilizers did not improve significantly the corn grain yield. These indicated that yields were limited by constraints other than P and Mn. The results suggest the need ofr careful interpretation when using statistical models to seek cause and effect relationships related to yield variability in fields. On the farm field characterized by sandy soils, most of the soil variation related to crop growth was described by five factors, which collectively explained 85% of the total soil variability. Regression models based on these factors were associated with 50% of the corn yield variation. Soil physical-chemical factor, as related to organic matter, texture, bulk density, and pH had the largest effect on the variation of corn yield. Loss of organic matter due to erosion, intensive tillage and input of nitrogen fertilizer, acidification and compaction were some indicators of soil and environmental degradation under current management practices.
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spelling Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.Propriedade fisico-quimicoMaizeChemicophysical propertiesIrrigaçãoMilhoSoloZea MaysirrigationsoilPrecision farming is important to development agricultural production systems and has created a need for spatial data on crop yield and soil characteristics. The objectives of this research were to identify: (i) the spatial and structural variation of soil properties across the landscape; (ii) how yields are related to these soil properties; and (iii) how information of spatial variability within soil physical, chemical, and biological properties can be used to asses in field soil degradation. On farm research was conducted on center-pivot-irrigated fields in Adams and Buffalo Counties, Nebraska, during 1997 and 1998. Samples were taken and analyzed soil physical, chemical, and biological properties, plant population, leaf tissue analysis for nutrients, and grain yields. Factor analysis, multivariate linear regressions, and geostatistics were used to explore soil and crop variability, and classify and map soil properties in the fields. On the farm field with a finer textured silty clay loam soil, soil variation was decomposed into five factors, which accounted for 75% of the total variance. Regression models based on these showed that soil fertility as related to available phosphorus and manganese, as associated with organic matter, was associated with 73% of corn yield variability. However, the application of Mn and P fertilizers did not improve significantly the corn grain yield. These indicated that yields were limited by constraints other than P and Mn. The results suggest the need ofr careful interpretation when using statistical models to seek cause and effect relationships related to yield variability in fields. On the farm field characterized by sandy soils, most of the soil variation related to crop growth was described by five factors, which collectively explained 85% of the total soil variability. Regression models based on these factors were associated with 50% of the corn yield variation. Soil physical-chemical factor, as related to organic matter, texture, bulk density, and pH had the largest effect on the variation of corn yield. Loss of organic matter due to erosion, intensive tillage and input of nitrogen fertilizer, acidification and compaction were some indicators of soil and environmental degradation under current management practices.Tese (Doutorado) - University of Nebraska, Lincoln.ANTONIO MARCOS COELHO, CNPMS.COELHO, A. M.2011-04-10T11:11:11Z2011-04-10T11:11:11Z2000-10-0520002017-05-25T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis175 p.2000.http://www.alice.cnptia.embrapa.br/alice/handle/doc/484182porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T01:01:30Zoai:www.alice.cnptia.embrapa.br:doc/484182Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T01:01:30falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T01:01:30Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
title Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
spellingShingle Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
COELHO, A. M.
Propriedade fisico-quimico
Maize
Chemicophysical properties
Irrigação
Milho
Solo
Zea Mays
irrigation
soil
title_short Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
title_full Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
title_fullStr Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
title_full_unstemmed Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
title_sort Irrigated corn yield as related to spatial variability of selected soil properties in a silty clay loam and sandy soils.
author COELHO, A. M.
author_facet COELHO, A. M.
author_role author
dc.contributor.none.fl_str_mv ANTONIO MARCOS COELHO, CNPMS.
dc.contributor.author.fl_str_mv COELHO, A. M.
dc.subject.por.fl_str_mv Propriedade fisico-quimico
Maize
Chemicophysical properties
Irrigação
Milho
Solo
Zea Mays
irrigation
soil
topic Propriedade fisico-quimico
Maize
Chemicophysical properties
Irrigação
Milho
Solo
Zea Mays
irrigation
soil
description Precision farming is important to development agricultural production systems and has created a need for spatial data on crop yield and soil characteristics. The objectives of this research were to identify: (i) the spatial and structural variation of soil properties across the landscape; (ii) how yields are related to these soil properties; and (iii) how information of spatial variability within soil physical, chemical, and biological properties can be used to asses in field soil degradation. On farm research was conducted on center-pivot-irrigated fields in Adams and Buffalo Counties, Nebraska, during 1997 and 1998. Samples were taken and analyzed soil physical, chemical, and biological properties, plant population, leaf tissue analysis for nutrients, and grain yields. Factor analysis, multivariate linear regressions, and geostatistics were used to explore soil and crop variability, and classify and map soil properties in the fields. On the farm field with a finer textured silty clay loam soil, soil variation was decomposed into five factors, which accounted for 75% of the total variance. Regression models based on these showed that soil fertility as related to available phosphorus and manganese, as associated with organic matter, was associated with 73% of corn yield variability. However, the application of Mn and P fertilizers did not improve significantly the corn grain yield. These indicated that yields were limited by constraints other than P and Mn. The results suggest the need ofr careful interpretation when using statistical models to seek cause and effect relationships related to yield variability in fields. On the farm field characterized by sandy soils, most of the soil variation related to crop growth was described by five factors, which collectively explained 85% of the total soil variability. Regression models based on these factors were associated with 50% of the corn yield variation. Soil physical-chemical factor, as related to organic matter, texture, bulk density, and pH had the largest effect on the variation of corn yield. Loss of organic matter due to erosion, intensive tillage and input of nitrogen fertilizer, acidification and compaction were some indicators of soil and environmental degradation under current management practices.
publishDate 2000
dc.date.none.fl_str_mv 2000-10-05
2000
2011-04-10T11:11:11Z
2011-04-10T11:11:11Z
2017-05-25T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
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format doctoralThesis
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dc.identifier.uri.fl_str_mv 2000.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/484182
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dc.language.iso.fl_str_mv por
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv 175 p.
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instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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