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The use of organic materials as substrates is an important alternative for sustainable agriculture. In this sense, the objective of this work was to evaluate the influence of different substrate sources on lettuce germination under controlled temperature. The experiment was conducted in the Ecology and Botany Laboratory CDSA / UFCG, in different substrates using the cultivar Americana Mauren. The design was completely randomized with 4 treatments, using 36 seeds per treatment. The treatments consisted of one control plus three treatments with substrates. The materials used were: bovine manure (EB); compound (C); humus (H) and washed sand (LA). The following parameters were evaluated: germination (G), rate of germination (IVG); length of seedlings (CP); and dry mass of the seedlings (DM). The emergency test was carried out in a protected environment (controlled temperature), where the seeds were seeded in sows containing the different substrates. According to the obtained results, it was verified that for all the evaluated parameters the different substrates used provided the necessary conditions allowing the seed to begin its germinative process. However, the substrate humus + sand (T4) and manure + sand (T2), were more efficient in relation to germination, germination speed index (IVG) and seedling length. For dry matter, the different substrates used did not provide high differences.

FONTES DE SUBSTRATOS ORGÂNICOS NA GERMINAÇÃO DA LACTUCA SATIVA L. SOB TEMPERATURA CONTROLADA