Casca de mamona associada a quatro fontes de matéria orgânica para a produção de mudas de pinhão-manso

Abstract

Castor hull combined with four organic matter sources for physic nut seedling productionSubstrates consisting of mixtures of soil and organic materials have usually been recommended for production of physic nut (Jatropha curcas L.) seedlings. Castor hull is a residue produced in large quantities during the hulling process. This residue contains high amounts of macronutrients. The objective of this study was to evaluate four organic materials for mixing with soil and castor hull. The experiment was conducted in a greenhouse at EMBRAPA Cotton Research Center between October and December 2006. The treatments were arranged in a complete randomized design with four replications and two plants per plot. Treatments were a mixture of soil and castor hull with one of the following materials: garbage compost, bovine manure, sewage sludge and castor presscake. The Control was a mixture of soil and castor hull. At 55 days after sowing, data on plant height, number of leaves, leaf area, stem diameter, dry weight of shoots and roots and leaf content of N, P, K, Ca, Mg and S were measured. All substrates were found suitable for production of physic nut seedlings, however the use of soil with castor hull only showed the lowest seedling Recebido para publicação em março de 2010 e aprovado em dezembro de 2010 1 Engenheira Agrônoma, Doutora, Departamento de Produção Vegetal, FAPESP/CNPq/PB.

Nutrient accumulation in the shoots of physic nut grown in two edaphoclimatic conditions

“…The maximum growth of the physic nuta plants was observed with the addition of simple superphosphate to the substrate in doses estimated to be in the range 5 to 8 kg m -3 . According to Lima et al (2011b), phosphate fertilizer favored the growth mainly of roots and leaf area. According to the same authors, the addition of phosphate fertilizer provided an increase in plant tissue concentration of all macronutrients, except for calcium.…”

“…When studying the redistribution of nutrients in physic nut leaves, Lima et al (2011b) found that the levels of K were higher in young leaves with more intense physiological activity, but as these processes reduced, K was redistributed to other plants organs. According to Pacheco et al (2009), the stem, besides being a structural organ of the plant, is a reserve organ.…”

Posição da folha e estádio fenológico do ramo para análise foliar do pinhão-manso

“…O pinhão-manso (Jatropha curcas L.) é uma espécie perene pertencente à família das Euforbiáceas, de porte arbustivo e crescimento rápido (Lima et al, 2010), originária da América Central mas se encontra vegetando espontaneamente em diversas regiões do Brasil (Lima et al, 2011). Seu cultivo despertou o interesse econômico após a descoberta do alto teor de óleo apresentado em suas sementes (33 a 38%) o que representa entre 53 e 79% do peso de seus frutos (Dias et al, 2007) e por se tratar de uma planta rústica adaptada a diversas condições edafoclimáticas (Arruda et al, 2004).…”

Redistribuição de nutrientes em folhas de pinhão-manso entre estádios fenológicos

“…Seu cultivo despertou o interesse econômico após a descoberta do alto teor de óleo apresentado em suas sementes (33 a 38%) o que representa entre 53 e 79% do peso de seus frutos e por se tratar de uma planta rústica adaptada a diversas condições edafoclimáticas (Arruda et al, 2004;Lima et al, 2010;2011).…”