Efeito de doses do composto orgânico bokashi associado à thichoderma SP. Na produção e no controle da podridão radicular da melancia.

Abstract

The culture of watermelon can be affected by various pathogens that act on the root system of plants, affecting the absorption and transport of water and nutrients, interfering in the processes vital to their development.The experiments were conducted in the CCTA / UFCG, Campus de Pombal. The first evaluated the effect of different doses (0,14mL, 28ml, 56ml and 112mL / plant) of Bokashi organic compound in the control of root rot caused by Fusarium spp. in two simultaneous steps using sterile soil and non-sterile in greenhouse doses were applied weekly using the watermelon cultivar 'Crimson Sweet' that was sown in pots containing six kilograms of clay soil, made up of six treatments with five repetitions. We evaluated total soil microbial population, collected at 0, 30, and 60 days after planting watermelon and to a depth of about 10 cm and close to the root system beyond the incidence and severity of root rot, dry and fresh matter of watermelon. The second field experiment evaluating the top two doses of organic compost 'Bokashi, (112ml and 56ml) of the previous experiment and other doses (224ml and 0ml), distributed as follows (with Trichoderma 112ml, 112ml without Trichoderma, with Trichoderma 56ml, 56ml without Trichoderma, with Trichoderma a 224ml, 224ml without Trichoderma, 0ml with Trichoderma, 0ml without Trichoderma) totaling eight treatments and five replications which were assessed the incidence and severity of root rot and the agronomic characteristics of culture as a mass accumulation of plants, photosynthetic rate (a), stomatal conductance (gs), transpiration (E) and intercellular CO2 concentration (Ci), fresh and dry matter of shoot and total production of fruits. In the study of greenhouse treatments with 56ml dose of Bokashi associated with Trichoderma and what used dose of 112ml of Bokashi achieved significant results in reducing fungal pathogens incidence in watermelon planted in non-sterile soil and severity of root rot Fusarium spp in sterile soil. In the field dose of 112ml Bokashi associated with Trichoderma achieved a reduction in both the incidence of fungal pathogens as the severity of root rot in watermelon. Bokashi associated with Trichoderma got better control the incidence and severity of root rot in watermelon.