Nutrient accumulation and productivity of crambe according to fertilization castor bean and serpentinite/Acumulo de nutrientes e produtividade de crambe em funcao da fertilizacao com torta de mamona e serpentinito

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.sup.-1] of cake castor bean PDS (equivalent to the application of 0, 15, 30, 60, 120 and 240kg [ha.sup.-1] of N) and the doses of serpentinite silicate 0 and 1t [ha.sup.-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.sup.-1] of castor bean PDS was the most suitable for the fertilization of the crop crambe. Key words: waste in agriculture, biofuel, oilseeds, Crambe abyssinica. O uso de fontes alternativas para a fertilizacao na agricultura vem sendo cada vez mais explorada pelo homem, devido a escassez das fontes finitas dos minerais utilizados atualmente. Produtos como a torta de mamona e silicatos de serpentinito podem ser fontes viaveis para o uso na agricultura. Com isso, o objetivo deste trabalho foi avaliar os teores e conteudos de N, P, K, Ca e Mg na cultura do crambe, assim como a sua producao em funcao da adubacao com torta de mamona PDS e silicato de serpentinito. O experimento foi conduzido em casa de vegetacao em um delineamento inteiramente casualizado, com sete doses de torta de mamona PDS e duas doses de silicato de serpentinito (com e sem enxofre elementar), totalizando 21 tratamentos. Utilizaramse as doses de 0,0; 0,5; 1; 2; 4; 6 e 8t [ha.sup.-1] de torta de mamona PDS (equivalente a aplicacao de 0, 15, 30, 60, 120 e 240kg [ha.sup.-1] de N) e as doses de silicato de serpentinito em 0 e 1t [ha.sup.-1], com e sem enxofre. A aplicacao de silicato de serpentinito sem enxofre aumentou os teores e conteudos de nutrientes de N, P, K, Ca e Mg