Eficiência agroeconômica de beterraba adubada com flor-de-seda em duas estações de cultivo.

Abstract

The use of spontaneous species from the northeastern semi-arid region as an alternative in the fertilization of vegetables, presents itself as a promising activity in increasing the productivity and economic efficiency of agricultural production systems. Therefore, the objective of this work was to evaluate the agroeconomic efficiency of beetroot as function of different amounts of roostertree (Calotropis procera) dry biomass in two cropping seasons. Two experiments were carried out at the 'Rafael Fernandes' Experimental Farm of the Universidade Federal Rural do Semi-Árido (UFERSA), from October to December 2021 and September to November 2022. The experimental design was randomized blocks, with five treatments and five replicates. The treatments consisted of different amounts of roostertree biomass in the doses of 16, 29, 42, 55 and 68 t ha-1 on a dry basis. Two treatments were added to each block, one without fertilizer and the other with mineral fertilizer, for comparison with the maximum agroeconomic efficiency treatment. The agronomic characteristics evaluated were: plant height, number of leaves per plant, dry mass of shoots, dry mass of roots, productivities total and commercial of roots and productivity of classified roots according to diameter in: large, extra AA, extra A, extra and scrap. The economic indicators evaluated were: gross income, net income, rate of return and profit margin. The highest agronomic efficiency obtained was with the beet productivity of 36.14 t ha-1 when the amount of 61.29 t ha-1 of roostertree dry biomass was incorporated into the soil. As for economic efficiency, the best result achieved was with the net income of 68,740.15 R$ ha-1 made possible with the incorporation into the soil of 58.68 t ha-1 of the green manure dry biomass. The use of roostertree as green manure is a viable alternative for vegetable production systems in the northeastern semi-arid region.