Relationships between soil and plant characteristics in three sesame varieties under different management practices

This study had as objetive to determine the relationship among bulk density (BD), soil moisture content (MC) with vegetative and reproductive characters in three sesame varieties (Sesamum indicum L.). The experiment was carried out at the experimental station of the Universidad de Oriente on an Ultisol savanna soil. Linear correlation coefficients were calculated from a split-plot design with four tillage treatments assigned to the main plot: chisel plow + rotary cultivator, chisel + harrow, rotary cultivato only, and harrow only. The subplots were constituted by a factorial arrangement of three sesame varieties: Glauca, Acarigua and Blanca, and two forms of urea placement: buried or surface, for a total of 24 treatments with three replications. The percentage of plants at blooming (PPB) 40 days after sowing (DAS) was positively (+) correlated with the stem diameter (SD) and the BD 52-DAS, and negatively (-) with height of the first capsule (HFC) and plant height (PH). The SD was correlated (+) with effective length of loading and this one with HFC, PH and MC 99-DAS. HFC was correlated (+) with PH, BD 99-DAS and NC with BD and MC 52-DAS. The PH was correlated (+) with BD and MC 99-DAS and (-) with BD and MC 52-DDS. Witin physical soil parameters, only BD and MC 52-DAS were correlated (+). Neither, management practices nor sesame varieties affect correlations between ELL and HFC, HFC and PH, and BD and MC 52-DAS. The tillage methods or the form of urea placenent did not affect correlations between PPB and HFC. The correlations between PPB and SD or ELL and PH were not affected by the different sesame varities El estudio tuvo como objetivo interrelacionar variables del suelo como la densidad aparente (DA) y el contenido de humedad (CH) con caracteres vegetativos y reproductivos en tres variedades de ajonjoli (Sesamum indicum L.). El experimento se llevo a cabo en la Estacion Experimental de Sabana de la Universidad de Oriente. Se calcularon coeficientes de correlacion lineal simple a partir de un diseno de parcelas divididas. Las parcelas principales estuvieron constituidas por cuatro tratamientos o metodos de labranza: uso de cincel + rotativa, cincel + rastra, solo rotativa, o solo rastra. Las subparcelas estuvieron constituidas por un arreglo factorial de las variedades: Glauca, Acarigua y Blanca, y por dos formas de aplicacion de urea: enterrada Y superficial, para un total de 24 tratamientos con tres repeticiones. El porcentaje de plantas con flores (PP