Resposta da mamoneira BRS-188 Paraguaçu a diferentes níveis de água e matéria orgânica no solo.

Abstract

The castor been culture is of great importance due to the several applications of one of its sub-products, the oil, being this the only glycerid soluble in alcohol, one of the most important raw material for the biodiesel extraction and the basis for diverse other industrial products. These properties give to the culture an important potential from the economical and strategic viewpoint of the country. The objective of the present work was to study the sensibility of the castor bean (Cultivar BRS 188 - Paraguacu) to different levels of water and organic matter of the soil, on the development, growing and production. The experiment was conducted on a greenhouse located on the dependences of the Agricultural Engineering Department of the Federal University of Campina Grande, Paraiba during the period of April to August 2006. The experiment used was a 2 x 4 factorial on a ramdomized-complete block design, constituted of two soil organic matter contents (0,5 e 2,5%) and four soil water contents (100, 90, 80 e 70% of the available water for the plants) with 3 replicates. A castor bean plant was grown on a 75 Kg capacity plastic vase until 120 days. The soil water content was daily monitored with TDR equipment. After measured the development, growing and production variables, the results were submitted to the analyses of variance, Tuckey tests and regression analysis to study the effect of the treatments. The results allowed to conclude that the castor bean cultivar BRS 188 was positively influenced by the increase of organic matter and water on the soil. The high water use efficiency obtained, mainly on the presence of organic matter and irrigation when the soil available water reaches 90% turn necessary the use of these insumes to obtain the best sustainability of the castor bean production.