Mineralização do nitrogênio da palhada de milheto dessecado com herbicidas
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Data
2009
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Resumo
Currently research verified that glyphosate or ammonium glufosinate herbicides use for
cover crop desiccation in conservationist systems may reduce N amount in straw. The aim of
this study was to evaluate nitrogen mineralization in millet straw after glyphosate or ammonium
glufosinate application and the N uptake by corn plants. A complete randomized design was
used with six treatments and five replications, in a 3 x 2 factorial scheme: cover crop management
(without herbicide application, glyphosate or ammonium glufosinate desiccation) and soil
type (Typic Quartzipsamment and Red Oxisol). The residual millet straw dry matter on the soil
surface was higher after herbicide desiccation than in the control. The soil mineral N, originated
from millet straw, the microbial biomass C and nitrification were lower in herbicide-desiccated
millet than in the control. Chemical millet desiccation did not affect the dry matter production
and total N of the following corn crop, although the corn nitrogen content, derived from the
straw, was reduced by millet desiccation with glufosinate herbicide. The nitrogen mineralization
of millet straw was reduced by herbicide desiccation with glyphosate or glufosinate.
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Decomposição, Glyphosate, Pennisetum glaucum, Glufosinato de amônio, Decomposition, Glyphosate, Pennisetum glaucum, Ammonium glufosinato
Citação
DAMIN, Virginia; TRIVELIN, Paulo César Ocheuze; BARBOSA, Tiago de Godoy. Mineralização do nitrogênio da palhada de milheto dessecado com herbicidas. Revista Brasileira de Ciência do Solo, Viçosa, v. 33, n. 4, p. 925-934, 2009.