Produção de mudas de alface em substratos alternativos a partir de sementes peletizadas com vermicomposto bovino, peletizadas comerciais e não peletizadas

Abstract

The present work had the objective of evaluating the quality seedlings production of two lettuce cultivars, 'Regina' and 'Mimosa Salad Bowl' purple, with the use of alternative substrates from bare, pelleted and nude seeds. Two experiments were conducted in a greenhouse, ‘Regina’ in 2015 and ‘Mimosa Salad Bow’l purple in 2016, where seven substrates (T1-commercial substrate, T2-bovine manure vermicompost (100%), T3-bovine manure vermicompost (65%) + carbonized rice husk (35%), T4- bovine manure vermicompost 65%) + pine crushed (35%), T5-ovine manure vermicompost (100%), T6- ovine manure vermicompost (75%) + carbonized rice husk (25%), T7- ovine manure vermicompost (75%) + pine crushed (25%)) and three types of seeds (nude pelleted with bovine manure vermicompost, bare and pelletized). The sowing was done in trays of expanded polystyrene with 128 cells. The experimental design was a randomized block design with four replications. The following variables were evaluated: emergence velocity index, lap diameter, root length, seedling height, dry and fresh fitomass aerial and root, stability of the clod, height / height ratio, Dickson Quality Index and nitrogen, potassium, phosphorus, calcium and magnesium of the aerial part of the seedlings. It was observed in this study that: mixtures of bovine manure vermicompost (65%) + carbonized rice husk (35%) and bovine vermicompost (65%) + pine crushed (35%) can replace the commercial substrate in the production of seedlings Lettuce 'Mimosa Salad Bowl', while for 'Regina' bovine vermicompost (65%) + carbonized rice husk (35%) may replace the commercial substrate. The bovine manure vermicompost favors a sufficient nutritional contribution to lettuce seedlings ‘Regina’ and ‘Mimosa Salad Bowl’ purple produced through bare seed pellets with bovine manure vermicompost, bare and pelleted®. It is feasible to produce 'Regina' lettuce and 'Mimosa Salad Bowl' seedlings through bare seeds pelleted with bovine manure vermicompost.