Produtividade de alface sob diferentes fontes de adubação orgânica.

Abstract

The application of organic fertilizers enables soil to improve its properties (physical, chemical and biological) in order to obtain good responses to plants while maintaining the fertile soil and allowing the maximum range of crop productivity. In this application can be employed organic waste from various sources, either animal or plant. The objective was to evaluate the production of lettuce (Lactuca sativa L.) under different sources of organic fertilizers, animal (goat manure) and vegetable (green manure). The experiments was developed at the experimental area of the Center for Science and Technology Agrifood the Federal University of Campina Grande, in the municipality of Pombal, PB. In the first step we evaluated the effect of applying goat dung proportions in lettuce productivity. The treatments consisted of five proportions of goat manure: 0%; 25%; 50%; 75% and 100% of the recommended dose in five replicates, using spacing of 0.25 x 0.25 m between plants.The following parameters were analyzed: shoot height, head diameter, number of leaves, fresh weight of shoot, fresh weight of root, total fresh mass, shoot dry weight, root dry mass, total dry weight, volume roots and productivity. In the second stage, was aimed to compare legume species with potential for fertilizer-green in pre-planting in lettuce production. were tested seven treatments: T1 = mineral fertilization; T2 = juncea Crotalaria (Crotalaria juncea); T3 = Cowpea beans (Vignia unguiculata); T4 = bean (Phaseolus vulgaris); T5 = Labe-labe (Dolichos lablab); T6 = spontaneous plants and T7 = pigeon pea beans (Cajanus cajan). The legumes have been sown directly in the field. At 30 days after transplanting were analyzed: shoot height, head diameter, number of leaves, weight fresh of aerial part and root, dry weight of aerial part and root, total fresh weight of aerial part and root and productivity. The results were submitted to a 5% probability. The data of proportions were analyzed in polynomial regression. The use of increasing proportions of goat manure dose caused a linear increase in all characteristics, however, the dose approximately 75% of that recommendation has been provided better results contributing to the development of lettuce plants. In the second stage the results showed that the studied parameters, the use of labe-labe provided greater productivity in lettuce when purchased with other legumes.