Avaliação dos parâmetros iniciais de crescimento da mamona sob adubação orgânica.

Abstract

The culture of castor bean is presented as a promising alternative for producers of semiarid northeast, mainly due to its characteristics such as climate adaptation and chemicals present in the seeds of paramount importance for the production of Biodiesel, however, there are still few studies on techniques management of this culture, especially as a fertilizer. Thus, this study was conducted to evaluate the initial development of castor bean subjected to six levels of nitrogen (0, 60, 100, 140, 180 and 220 kg ha-1), using as source the urban waste compost. The study was conducted in a greenhouse belonging to the Federal University of Campina Grande (UFCG) with a completely randomized design, corresponding to the 6x2 factorial designs with three replications, totaling 36 experimental units. The growth parameters were evaluated: plant height, stem diameter and number of leaves, these were assessed at 15, 30 and 45 days after plant emergence (DAE). In addition to treatments with nitrogen, two sources of water were used to irrigate these plants did not differ significantly by Tukey test at 5% probability, however, the wastewater was the one that stood out, obtaining higher values for measures analyzed. For the monitored variables, nitrogen rates equivalent to 180 and 220 kg ha-1 of compost were the ones that provided the best results for the cultivation of castor beans.