Crescimento inicial do pinhão manso (Jatropha curcas L 1753.) em função de fontes e quantidades de fertilizantes

• Autor(a) principal: Guimarães, Andreia de Sousa
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/tede/8201
• topic: Adubação orgânica; Organic fertilization; Jatropha curcas; Adubação foliar e crescimento inicial; Jatropha curcas; Foliar fertilization; Initial growth; CIENCIAS AGRARIAS::AGRONOMIA

Among species that are being prospected for biodiesel production, the pinhão-manso (Jatropha curcas) has been outstanding as an oleaginous plant with essential qualities in biodiesel production. Perennial plant of the Euphorbiaceous family resistant to the adverse climate and soil conditions whose oil production's potential has been considered high. In the last years, a lot of researches had appeared around the crops for a better comprehension, once there's a lack of information regarding the agronomic plant requirements. By knowledge necessity for farming enlargement of that species, this work addressed to verify and to quantify the fertilizing effects in the edaphic and foliar region in pinhão-manso’s (Jatropha curcas) initial growth, as well as evaluate the Nitrogen and Potassium dosage effects in the initial plant growth through the foliar fertilization. The researches were accomplished in the period of April, 2006 to April, 2007, in the National Center of Research and Cotton - CNPA - EMBRAPA. Two experiments were implanted with randomized experimental design in blocks, in which the first one consisted of 17 treatments with three repeated sessions and four fertilizers application (bovine manure, biosolids, castor presscake and urea) each one with four different dosage (85, 170, 225 and 340 Kg/ha) via soil. The second experiment applied through foliar fertilization consisted by a factorial [(4 x 4) +1], with three repetitions, about seventeen treatments in four dosages types of Urea (6, 8, 10 and 12%) and Chloride of Potassium (2, 4, 6 and 8%). The following variables were estimated: stem height, diameter, foliar area, phytomass and vegetable analysis to the 15, 30, 45, 60, 75, 90, 105, 120, 135 DAE through soil. The same variables were estimated through foliar fertilization in the period of 65, 80, 95, 110, 125 and 140 DAE. When fertilized with biosolids and castor presscake treatments, the Pinhão Manso’s crops increased significantly, the plant growth promoting an additional of 40,90% to the height under the biosolid treatment and 40,60% to the stem diameter when fertilized with castor presscake, compared to the control. The pinhão-manso plants were benefited by fertilization, especially with the NPK-mineral, increasing the height of 96,14% when compared to the control, without the fertilizers usage. The crop through foliar/leaf fertilization had no significant differences among the practical treatments, obtaining a stem height addition with N4K4 dosage (amount) of 11,47% at the end of the experiment relatively to the control. The root length in the KCl/N45 dosage presented an increase of 172% in relation to witness when compared to the 24Kg/ha proportion.