PRODUCTION OF LETTUCE UNDER GREEN MANURING WITH Calotropis procera IN TWO CULTIVATION SEASONS
2017
ÊNIO GOMES FLÔR SOUZA | EDSON FERREIRA DE LIMA | AURÉLIO PAES BARROS JÚNIOR | LINDOMAR MARIA DA SILVEIRA | FRANCISCO BEZERRA NETO | ELLEN ABREU DA CRUZ
The production of vegetable crops is characterized by intensive land use, high input demands and the requirement of strategic management adoption with an agro - ecological approach. In this study, agronomic indicators were evaluated in lettuce fertilized with different amounts of roostertree biomass; fertilizer was incorporated into the soil at distinct times and seedlings were planted in two cropping seasons (spring and autumn - winter) in Serra Talhada, Pernambuco state, Brazil. The experimental design consisted of randomized complete blocks with three replications and treatments arranged in a 4 x 4 factorial scheme. The first factor was the amounts of roostertree biomass (5.4, 8.8, 12.2, and 15.6 t ha - 1 on a dry basis) and the second the manure incorporation times (0, 10, 20, and 30 days before lettuce transplanting). The variables evaluated in the lettuce crop were: plant height and diameter, number of leaves per plant, productivity of green mass, and dry shoot mass. Maximum productivity and dry shoot mass were obtained using fertilization with 15.6 t ha - 1 . A synchrony between supply of nutrients by green manure and the period of maximum demand by lettuce was observed in the incorporation times of 10 (spring) and 20 (autumn - winter) days before transplanting. Cultivation in the spring resulted in higher vegetative growth.
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