The use of alternative sources for fertilization in agriculture is being increasingly exploited by man because of the shortage of the finite sources of minerals used today. Products such as cake castor bean and serpentinite silicate, may be viable sources for use in agriculture. Thus, the aim of this study was to evaluate the contents and accumulation of N, P, K, Ca and Mg in the culture of crambe, as well as their production in line with fertilization cake castor bean PDS and silicate serpentinite. The experiment was conducted in a greenhouse in a completely randomized design with seven doses of cake castor bean PDS and two doses of serpentinite silicate (with and without elemental sulfur), totaling 21 treatments. We used doses of 0.0, 0.5, 1, 2, 4, 6 and 8t ha-1 of cake castor bean PDS (equivalent to the application of 0, 15, 30, 60, 120 and 240kg ha-1 of N) and the doses of serpentinite silicate 0 and 1t ha-1 for with and without sulfur. The application of serpentinite silicate without sulfur increased the content and nutrient content of N, P, K, Ca and Mg and crambe seed production. The use of cake castor bean PDS as organic fertilizer increased the growth and development of crambe. A dose of 8t ha-1 of castor bean PDS was the most suitable for the fertilization of the crop crambe.
waste in agriculture; biofuel; oilseeds; Crambe abyssinica
