Chemical and physical fertility indicators of a weakly-structured Ultisol after liming and mulching

In the humid tropic, chemical and physical soil properties that decrease soil's nutrient availability and increase oxygen deficiency are important as restrictions to crop growth. The objective of this study was to evaluate the relations between plant growth and chemical and physical fertility i...

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Published in:Scientia agricola Vol. 66; no. 6; pp. 800 - 805
Main Authors: Moura, Emanoel Gomes de(UEMA), Coelho, Kátia Pereira(UEMA), Freitas, Idelfonso Colares de(UEMA), Aguiar, Alana das Chagas Ferreira(UFMA Centro de Ciências Agrárias e Ambientais)
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Published: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" 01-12-2009
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Abstract In the humid tropic, chemical and physical soil properties that decrease soil's nutrient availability and increase oxygen deficiency are important as restrictions to crop growth. The objective of this study was to evaluate the relations between plant growth and chemical and physical fertility indicators of an Ultisol developed from sediments of the Itapecuru Formation in Central-Northern state of Maranhão, Brazil. An experiment was established with randomized block design, four replicates, and six treatments: 6.0 Mg ha-1 mulch with or without liming; 3.0 Mg ha-1 mulch with or without liming; bare soil with or without liming. Determinations in the plants included leaf area index, net assimilation rate, and the yield parameters: mean number and weight of ears, 100-kernel weight, harvest index, and total grain yield. Soil determinations consisted of bulk density variations on the surface and at 20 cm, effective porosity evolution after intentional flooding, and alterations in chemical indicators such as cation exchange capacity, bases saturation, organic carbon, and macronutrient contents. Mulching and liming were equivalent with regard to their influence on leaf area yield, but mulching was more important for corn productivity because of its greater effect on net photosynthesis. No trópico úmido, os indicadores químicos e físicos, que diminuem a disponibilidade de nutrientes e aumentam a deficiência de oxigênio dos solos, são importantes para diagnosticar restrições ao crescimento das culturas. Avaliaram-se as relações entre o crescimento das plantas e os principais indicadores físicos e químicos da fertilidade de um Argissolo desenvolvido em sedimentos da Formação Itapecuru, no Centro-Norte do Maranhão. O experimento foi instalado em blocos casualizados, com quatro repetições e seis tratamentos: 6,0 Mg ha-1 de cobertura morta com e sem calagem; 3,0 Mg ha-1 de cobertura morta com e sem calagem; solo descoberto com e sem calagem. Nas plantas, foram determinados o índice de área foliar, a taxa de assimilação líquida e os parâmetros de produtividade: número e peso médio das espigas, peso de 100 grãos, índice de colheita e produção total de grãos. No solo foram avaliadas as variações nas densidades na sua superfície e a 20 cm, a evolução da porosidade efetiva após alagamento provocado e as alterações em indicadores químicos como capacidade de troca catiônica, saturação por bases, carbono orgânico e teores de macronutrientes. A cobertura morta e a calagem se equivaleram quanto à influência na produção da área foliar, mas a cobertura morta foi mais importante para a produtividade do milho, devido ao seu maior efeito sobre a fotossíntese líquida das plantas.
AbstractList In the humid tropic, chemical and physical soil properties that decrease soil's nutrient availability and increase oxygen deficiency are important as restrictions to crop growth. The objective of this study was to evaluate the relations between plant growth and chemical and physical fertility indicators of an Ultisol developed from sediments of the Itapecuru Formation in Central-Northern state of Maranhão, Brazil. An experiment was established with randomized block design, four replicates, and six treatments: 6.0 Mg ha-1 mulch with or without liming; 3.0 Mg ha-1 mulch with or without liming; bare soil with or without liming. Determinations in the plants included leaf area index, net assimilation rate, and the yield parameters: mean number and weight of ears, 100-kernel weight, harvest index, and total grain yield. Soil determinations consisted of bulk density variations on the surface and at 20 cm, effective porosity evolution after intentional flooding, and alterations in chemical indicators such as cation exchange capacity, bases saturation, organic carbon, and macronutrient contents. Mulching and liming were equivalent with regard to their influence on leaf area yield, but mulching was more important for corn productivity because of its greater effect on net photosynthesis. No trópico úmido, os indicadores químicos e físicos, que diminuem a disponibilidade de nutrientes e aumentam a deficiência de oxigênio dos solos, são importantes para diagnosticar restrições ao crescimento das culturas. Avaliaram-se as relações entre o crescimento das plantas e os principais indicadores físicos e químicos da fertilidade de um Argissolo desenvolvido em sedimentos da Formação Itapecuru, no Centro-Norte do Maranhão. O experimento foi instalado em blocos casualizados, com quatro repetições e seis tratamentos: 6,0 Mg ha-1 de cobertura morta com e sem calagem; 3,0 Mg ha-1 de cobertura morta com e sem calagem; solo descoberto com e sem calagem. Nas plantas, foram determinados o índice de área foliar, a taxa de assimilação líquida e os parâmetros de produtividade: número e peso médio das espigas, peso de 100 grãos, índice de colheita e produção total de grãos. No solo foram avaliadas as variações nas densidades na sua superfície e a 20 cm, a evolução da porosidade efetiva após alagamento provocado e as alterações em indicadores químicos como capacidade de troca catiônica, saturação por bases, carbono orgânico e teores de macronutrientes. A cobertura morta e a calagem se equivaleram quanto à influência na produção da área foliar, mas a cobertura morta foi mais importante para a produtividade do milho, devido ao seu maior efeito sobre a fotossíntese líquida das plantas.
In the humid tropic, chemical and physical soil properties that decrease soil's nutrient availability and increase oxygen deficiency are important as restrictions to crop growth. The objective of this study was to evaluate the relations between plant growth and chemical and physical fertility indicators of an Ultisol developed from sediments of the Itapecuru Formation in Central-Northern state of Maranhão, Brazil. An experiment was established with randomized block design, four replicates, and six treatments: 6.0 Mg ha-1 mulch with or without liming; 3.0 Mg ha-1 mulch with or without liming; bare soil with or without liming. Determinations in the plants included leaf area index, net assimilation rate, and the yield parameters: mean number and weight of ears, 100-kernel weight, harvest index, and total grain yield. Soil determinations consisted of bulk density variations on the surface and at 20 cm, effective porosity evolution after intentional flooding, and alterations in chemical indicators such as cation exchange capacity, bases saturation, organic carbon, and macronutrient contents. Mulching and liming were equivalent with regard to their influence on leaf area yield, but mulching was more important for corn productivity because of its greater effect on net photosynthesis.
Author Freitas, Idelfonso Colares de(UEMA)
Moura, Emanoel Gomes de(UEMA)
Aguiar, Alana das Chagas Ferreira(UFMA Centro de Ciências Agrárias e Ambientais)
Coelho, Kátia Pereira(UEMA)
AuthorAffiliation Universidade Estadual do Maranhão
Universidade Federal do Maranhão
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  fullname: Coelho, Kátia Pereira(UEMA)
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10.1016/j.geoderma.2006.08.012
10.1007/s11104-007-9316-3
10.1126/science.218.4571.443
10.2136/sssaj1998.03615995006200050011x
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10.1016/S0167-1987(02)00083-1
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Issue 6
Keywords effective porosity
produtividade
yield
porosidade efetiva
growth
Zea mays L
crescimento
Language English
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Snippet In the humid tropic, chemical and physical soil properties that decrease soil's nutrient availability and increase oxygen deficiency are important as...
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SubjectTerms AGRICULTURE, MULTIDISCIPLINARY
crescimento
effective porosity
growth
porosidade efetiva
produtividade
yield
Zea mays L
Title Chemical and physical fertility indicators of a weakly-structured Ultisol after liming and mulching
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