Inflorescência da mamoneira sob diferentes níveis de reposição de água de irrigação – condições de campo.

Abstract

The economical importance of the castor bean is evidenced due to its wide industrial application. The castor bean is a tropical plant commercially cultivated in more than 15 countries and Brazil as the third biggest producer and with the high demand for oil production, it will need to expand its cultivated areas. Due to the scarce information of soil and water management of the in situ castor bean, the objective of the present research was to study the inflorescence emission of the BRS 188 – Paraguaçu and BRS 149 varities under different soil water regimes. The experiment was conducted from October 2008 to March 2009 under field conditions using a randomized block 2x4 factorial design with two plant varities, four levels of available water (100, 80, 60 and 40% ) and three replicates. Each experimental plot was constituted by an useful area of 104.5 m2, where 60 plants, spaced in 2m x 1m, were cultivated, being 28 useful plants. At regular time intervals the emission of flowering was monitored and the results analyzed statistically throughout analyses of variance, Tukey tests and regression analyses. The blooming of both castor bean varities increased with the soil water content.