Influence of environmental temperature and sowing date on the phenological phase lengthening of four rice (Oryza sativa L.) cultivars
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Abstract
“Los Palacios” Scientific-Technological Base Unit (UCTB)
in Pinar del Rio province, pertaining to the National Institute
of Agricultural Sciences.Two short-season cultivars (INCA
LP-5 and Reform) and two half-season cultivars (INCA
LP-2 and J-104) were used and seeded in four sowing
dates (January-2004, December-2004, February-2005 and
January-2006) over the winter season, on a Petroferric
Ferruginous Nodular Gley Hydromorphic soil. The
objective was to determine the influence of environmental
temperature and seeding date on the phenological phase
variation of four rice cultivars. A randomized block design
with four replications was used. Based on the results, it can
be concluded that the longest vegetative and reproductive
phase was recorded at the dates of December-2004 and
January-2006, corresponding to the lowest temperature
values reported in this work. The accumulated temperature
necessary to complete the biological cycle of INCA LP-5,
Reform and INCA LP-2 cultivars is within a range from 1900
to 2150 °C, whereas for J-104 is between 2200 and 2260 °C.
Highest yields correspond to the longest reproductive phase
forevery cultivar studied.
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