Plantas de cobertura e atributos físico-hídricos de um latossolo vermelho distrófico em sistema de produção orgânico
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2006-06-29
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Universidade Federal de Goiás
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This work had the objective to evaluate the effect of different soil cover plants
on the physical and hydrical attributes of a Rhodic Haplustox in an organic production
system, under two tillage systems, no-tillage (SPD) and conventional tillage (SPC). In each
soil tillage system, were evaluated the following cover plants: velvet bean (Mucuna
aterrima), sunn hemp (Crotalaria juncea), pigeon pea (Cajanus cajan), sorghum (Sorghum
technicum), and fallow. It were analyzed the soil physical and hydrical attributes and its
aggregation status in the soil layers of 0-10, 10-20 , and 20-30 cm deep. The experiments
were carried out at the experimental area of Embrapa Rice and Beans, in Santo Antônio de
Goiás, GO. The experimental design was a randomized blocks, in 2x5x3 factorial scheme,
with four replications. The soil cover plant management was done at flowering. The cover
plant straw stayed on the soil in SPD and it was incorporated at soil profile in SPC. The soil
water retention, evaluated by retention curves, was affected by soil tillage systems and cover
plants. In the superficial layer, 0-10 cm deep, there was higher soil water retention in notillage
system. In this system, at 0-30 cm deep, the soil cultivated with leguminous showed
higher soil water retention than that cultivated with sorghum or in fallow. The soil
aggregation status was influenced by soil tillage system. The percentage of aggregates with
diameter higher than 2 mm and the mean weight diameter of aggregates was higher in SPD
than in SPC, at 0-10 cm and 10-20 cm soil layers. It was observed a positive correlation
between these variables and soil organic matter in SPD. In two tillage systems, soil organic
matter content decreased with soil depth.
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TOLENTINO, E. R. S. Plantas de cobertura e atributos físico-hídricos de um latossolo vermelho distrófico em sistema de produção orgânico. 2006. 41 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2006.