Interferência do tratamento de sementes de alface com formulados comerciais de Trichoderma harzianum na produção de mudas

Abstract

The fungal genus Trichoderma is widely used in biological control of a range of pathogens, but can stimulate the germination and development of plants. The objective of this study was to assess and evaluate the effect of treatment of lettuce seeds with commercial formulated powder and liquid based on Trichoderma harzianum germination, seedling emergence and development. The experiments were performed in the laboratory of Plant Pathology and Soil Microbiology, Campus Itaqui / UNIPAMPA. Were used for the treatment of lettuce seeds formulated the basis of T. harzianum: TRICHODERMIL Organic ® powder and liquid TRICHODERMIL Organic ®. The tests consisted of germination test, where the seeds were sown for germination on paper and testing of emergency when the seeds were sown on substrates: commercial trees and sand (autoclaved). Evaluations for the germination test were: germination, green mass and dry mass of seedlings. To test the emergency, the evaluations were: emergency speed index, emergency, shoot length, root length and number of leaves. As a result it was observed that there were no significant differences for the evaluation of germination, the green mass and dry mass. For testing of emergency, no significant differences for distress, but there were interactions between the factors formulated in powder and liquid and substrates for the other evaluations. The liquid formulated stimulated the emergence speed index of emergency and development of roots and formulated powder inhibited the development of seedling lettuce. Regarding the number of leaves when grown in sand, the plants produced more leaves in the control treatment. Therefore, it is concluded that the formulated commercial powder and liquid-based Trichoderma harzianum used in this study do not influence on germination, seedling growth and emergence of lettuce. However, interfere with the speed of emergence and development of seedlings of lettuce. The commercial formulated powder and liquid-based Trichoderma harzianum used in this study may be indicated for the treatment of lettuce seeds, such as stimulating the production of seedlings.