Much of the production of vegetables, including lettuce, takes place on small farms, requiring the use of technologies that increase productivity without compromising environmental quality and food safety. Biofertilizers are sustainable alternatives to the farmer, to reduce or replace the use of soluble mineral fertilizers. These materials act directly or indirectly on all or parts of the cultivated plants, providing nutrients and increasing their productivity. These formulations are composed of materials that are easily accessible to the farmer, such as harvest remains, and microorganisms that act beneficially can also be used, increasing the availability of nutrients to plants, through biological processes. The objective of this work was to evaluate the quality of lettuce seedlings in different substrates. The experiment was installed in the agriculture sectorof the Center for Social and Agrarian Human Sciences-UFPB, in randomized blocks, with 4 replications and 4 treatments, using 200-cell polypropylene trays, each plot consisting of 20 seedlings. The evaluated treatments were: T1-commercial substrate; T2-filter cake biofertilizer and plant growth-promoting bacteria; T3-50% ravine soil and 50% bovine manure; T4-50% ravine soil and 50% goat manure. At 34 days after planting, the stem diameter, plant height, fresh weight of the aerial part, fresh weight of the root, dry matter of the aerial part, and dry matter of the root were evaluated. The biofertilizer had a similar effect to the commercial substrates, bovine manure, and goat manure in the development of lettuce seedlings.
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