Resumen

ORTIZ DOMINGUEZ, Aída  y  OJEDA MUNOZ, Marjorien. Evaluation of milling quality and grain dimensions of two rice varieties and their weedy rice variety types. Agronomía Trop. [online]. 2006, vol.56, n.3, pp.345-368. ISSN 0002-192X.

In this study the milling quality of Weedy rice-variety types (WRVT) originated from seed fields planted with D-Sativa and Fedearroz 50 was considered. Treatments were: D-Sativa, DS-B, DS-R, Fedearroz 50, FD-B and FD-R. A completely randomized experimental design with five replicas was used. Data were subjected to analysis of variance using SAS Software and mean Tukey at the 5% level of probability. Attributes associated with milling quality were measured. Rice varieties, Oryza sativa L., showed higher % of head rice (HR) than WRVT. The WRVT with red pericarp (FD-R y DS-R) showed approximately 10% less in HR than D-Sativa and Fedearroz 50, while the beige types showed a lesser difference (2%) with respect to their varieties of origin. However, the WRVT had more chalky+white belly grains (4,29% y 8,82%) than the varieties (3,35 y 3,68%), and the red types (5,46% FD-R y 8,82% DS-R) more than the beige ones (4,28% FD-B y 5,34% DS-B). Only the red WRVT showed red grains in polished rice (GRP), and of these, DS-R (21,31%) had 4,6 times more GRP than FD-R (4,64%). FD-R, FD-B and DS-B showed similar grain length as the varieties (>9mm), while DS-R had the shortest (8,58 mm) and widest (3,20 mm) grains in paddy. These results suggest that rice milling quality maybe affected by the presence of WRVT in rice paddy.

Palabras clave : Oryza sativa L; weedy rice-variety types; Fedearroz 50; D-Sativa; milling quality.