Produtividade e rentabilidade da alface adubada com flor de seda

Abstract

The production of vegetables is an impacting activity, which is characterized by intensive use of land, with high demand of inputs and requires adoption of strategic management with agroecological approach to sustain its production. Two experiments were conducted in the experimental area Universidade Federal Rural de Pernambuco (UFRPE) - Unidade Acadêmica de Serra Talhada (UAST), Serra Talhada – PE (Brazil), with the objective of evaluating the production of lettuce for different amounts of time and soil incorporation of Flor de Seda (Calotropis procera) two growing seasons. The experiments were conducted in two periods: the first was conducted in the dry season of 2011 (September-November) and the second during the rainy season of 2012 (May to July), In a randomized complete block design with treatments arranged in a factorial 4 x 4 + 2, with three replications, with the first factor consisting of different amounts of green manure incorporated into the soil (5.4, 8.8, 12, 2 and 15.6 t ha-1 on a dry basis) and the second factor for different times of incorporation of this fertilizer to the soil (0, 10, 20, and 30 days) plus two additional treatments, a fertilizing the absence of the other by use of 80 t ha-1 cattle manure. The lettuce cultivation used was Nanny summer, with spacing of 0,20 m x 0,20 m. The characteristics evaluated were plant height and diameter, number of leaves per plant, green mass yield and dry mass of shoots, plus some economic indicators such as gross income, net income, rate of return and profitability index. The best performances Agroeconomic lettuce were observed in the amount of 15.6 t ha-1 green manure Flor de seda in two cropping seasons, with the best results the time of incorporation of 0 days in the dry season and 20 days in the incorporation in rainy season.