EFEITO DO MANEJO DO SOLO E DO GESSO RESIDUAL NA CULTURA DA SOJA E EM ATRIBUTOS FÍSICOS DE UM LATOSSSOLO VERMELHO DISTROFÉRRICO / SOIL MANURE AND RESIDUAL GYPSUM EFFECT ON THE SOYBEAN CROP AND IN PHYSICAL ATTRIBURES OF DYSTROPHIC RED LATOSOIL

AUTOR(ES)

FÁBIO RÉGIS DE SOUZA

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

27/02/2009

RESUMO

Adoption of soil manure systems with or without conditioners can improve or reduce its physical quality, changing the answers of crops to the same ones. Thus, this paper aimed to evaluate the agronomic performance of soybean crop and the soil physical attributes. The paper was conducted in an area granted under a lending to Faculdade de Ciências Agrárias da Universidade Federal da Grande Dourados, located at coordinates 22 12 42,74 S e 54 56 17,26 W, and 452 m high. The climate is Cwa, according to Koppens rating. The soil on the experiment place is classified as Dystrophic Red Latosoil, originally under cerrado vegetation. For the soil physical attributes the experimental design was in randomized blocks with arrangement of subdivided plots, where the treatments were two manure systems (tillage system and conventional sowing, on the plots) and dosages of 0 and 2000 kg ha-1 of gypsum (subplots) and five depths (0-0,05, 0,05-0,10, 0,10-0,15, 0,15-0,20 and 0,20-0,30 m, being the subplots with four replications, it was decided to consider the studied depths as subplots independent on the randomization. For the agronomic features, the used experimental design was of randomized blocks, with four replications in experimental design of subdivided plots, being that the plots had the manure systems and as subplot the presence and absence of the gypsum residual effect with four replications. The obtained results show that the tillage system with gypsum residual effect increased the plants final height. The results show that the soil density was bigger under the tillage system and the gypsum residual effect influenced on the soil density at 0,10-0,15 m deep. The manures and gypsum residual effect made the porosity bigger at 0-0,05 m deep. The macroporosity was bigger at 0-0,05 m deep under conventional sowing and the microporosity was increased with the depth under the manure systems. The penetration resistance was increased in greater depths. The tillage system, with or without gypsum residual effect, provided the aggregates bigger geometric diameters. The aggregates morphological features varied in depth, both in tillage system and conventional sowing, and in presence or absence of gypsum residual effect.

ASSUNTO(S)

plantio direto e plantio convencional física do solo gessagem glycine max (l.) merr estrutura do solo manejo e conservacao do solo tillage system and conventional sowing soil physics gypsum glycine max (l.) merr soil structure

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