Indicadores de sustentabilidade em sistemas de rotação e sucessão de culturas com algodoeiro em plantio direto
Carregando...
Arquivos
Data
2006-08-30
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
The objective of this wok was to monitor sustainability indicators of soil involving the
cotton plant in different crop rotation and succession systems, as well as to evaluate cover
crop species which best adapt and that have longer longevity of decomposition as well as
their effects on the physical and chemical properties and characteristics of soil. The field
trials were developed in two sites. One experiment was conducted on the experimental
Farm of Campus II of the UFG, in the town of Goiânia-GO and the other in the
experimental area of the Fundação GO, in the town of Santa Helena de Goiás- GO. Both
plant mass yield and decomposition longevity were evaluated in Goiânia by the litterbag
process as well as also the physical and chemical characteristics of soil and cotton
seed yield kg ha-1 and grain soybean kg ha-1, upon the effect of different cover crop
species. The single covers which provided increased dry plant mass yields were grain
sorghum followed by feather-grass, Crotalária + Millet and Brachiaria and in longevity, the
decomposition of the plant mass was maximum in the first 22 days standing out the
mixture Mucuna + grain sorghum which showed highest residual plant mass yield. Most
of the treatments involving the cover plant species in Goiânia presented the values of
resistance to penetration (RP) within the ranges considered from high to low. Crotalária
(Crotalária juncea) presented in Goiânia the lowest RP in solo, this being able to be the
best option for the farming system management. The lowest values of RP found at Santa
Helena were obtained by the cover crops Pigeon pea, Millet and grain sorghum. The crop
rotation systems studied did no differ as to the effect of soil density, total porosity,
macroporosity, microporosity and average diameter of aggregates. The elements P and Ca
proved limiting as well as pH, V% and CEC for the cotton crop. There was no influence of
the cover crop species on yield of the cotton plant and soybean.
Descrição
Citação
MENEZES, Luiz Antonio Silva. Sustainability indicators in crop rotation and succession systems
with cotton crop in no-tillage planting. 2006. 120 f. Tese (Doutorado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2006.