masterThesis
Efeito do chorume de suínos e do ph do solo sobre o tombamento de pepino causado por Pythium sp
Fecha
2010Registro en:
MANTELI, Claudia. Efeito do chorume de suínos e do ph do solo sobre o tombamento de pepino causado por Pythium sp. 2010. 70 f. Dissertação (Mestrado em Agronomia) - Universidade Tecnológica Federal do Paraná, Pato Branco, 2010.
Autor
Manteli, Claudia
Resumen
Among the soilborne plant pathogens, the Pythium sp. is one of the most aggressive
and difficult to control and affects several crops. In the culture of cucumber (Cucumis
sativus L.) causes collar rot and subsequent damping-off. Control of this pathogen is
based on cultural alternatives for the chemical treatment of seed not be effective. The addition of organic compounds promotes chemical changes in soil physical and
biological and nutritional changes in plants. The swine manure is presented as an
alternative to control this pathogen due to its availability and its nutritional potential. However, soil pH influences the release of different compounds by swine manure and consequently in its action on pathogens. For the genus Pythium, there are no reports of use of swine manure as an alternative control applied at different levels of soil pH. This study evaluated the effect of swine manure in soil with different pH levels on disease control on the development of the pathogen and its influence on chemical and biological soil. Three different situations were tested, and all maintained in the application of 0, 5, 10 and 15% manure. In experiments with
randomized arrangement. In Petry plates, evaluated the implementation of the
volumes of swine manure in soil with pH 4.8, 6.3 and 8.4, 1, 2 and 3 days of incubation on the mycelial growth of Pythium sp. In soil with pH 8.4 the growth of colonies was higher in all periods tested, and soil pH 4.8 and 6.3 with up to two days of development, the colonies had inhibited growth. In randomized experiments, with
incubation hermetic same volumes of swine manure, for four days in soil with pH 4.8,
6.3 and 8.4, we obtained a smaller rate of damping of plants in soil pH 4.8. In another
situation, it was evaluated in experiments with randomized block the effect of different amounts of swine manure on the registration of cucumber plants in pots.
The application of soil with two different pH levels (pH 4.8 and 6.3) revealed a lower
number of cucumber plants having fallen to the ground with pH 4.8. In all cases, the
antifungal effect of volatile fatty acids, released by swine manure, when applied to
soil with higher acidity level, he was appointed as the main cause of getting these
results.