UTILIZAÇÃO DE DIFERENTES TIPOS E CONCENTRAÇÕES DE CALDAS NUTRICIONAIS EM ATRIBUTOS AGRONÔMICOS DA ALFACE.

The effect of different types and concentrations of nutritional broths in the agronomic attributes of the lettuce is evaluated. The experiment was conducted in vegetable beds on a farm in the municipality of Ronda Alta RS Brazil, between August and October 2016. Experimental design consisted of randomized blocks, with seven treatments and five replications. Treatments comprised Bordeaux broth at 0.1 and 0.5%; liquid humus at 2.5% and 5%; Microgeo® at 0.5% and 1.0%; control. Variables analyzed were height of aerial segment, length of the root system, perimeter of the aerial segment, dry matter of the aerial segment and of the root segment, and weight decrease. Bordeaux broth at 0.5% for the variable height of aerial segment provided a greater rate than in the treatment with Microgeo® at 0.5%. For root length, treatment with liquid humus at 5% was equivalent to humus treatment at 2.5%, the former was superior to the others. In the case of dry matter of the root system, the employment of liquid humus and Microgeo®, in the two concentrations, provided the best results. In the case of weight decrease, broth with liquid humus and Bordeaux broth at 0.5% provided the best result. Results indicate the use of nutritional broth for lettuce cultivation. Regard to agronomic attributes, the use of liquid humus (2.5% and 5%) provided the longest roots and the smallest decrease in lettuce weight. [ABSTRACT FROM AUTHOR]