GENETIC COEFFICIENTS OF TWO RICE VARIETIES IN DIFFERENT PLANTING DATES
In order to determine the genetic coefficients in IDIAP 145-05 and IDIAP 38 rice varieties at different sowing dates, a trial was conducted in Tonosí, Los Santos, Panama, located between 7º26'03 '' of North latitude and the 80º24'37 '' west longitude at about 18 masl, between august to December 2016 and 2017. Two sowing dates were used each year, the first in august and the second in september. The plots were 100 m2 per variety with supplementary irrigation; four plants were taken randomly in each variety to determine the appearance of each phenological stage, to then determine the thermal time required for the evolution of each of its stages. The thermal weather was determined using the average daily temperature, averaging the maximum and minimum temperatures of the day of the locality. T-student test and descriptive statistics were performed (average, confidence interval 99%). There was a significant difference in the duration of the cycle in days with respect to the sowing dates for both varieties, while there was no statistical difference in the accumulation ºCday to meet its phenological cycle. The variety I-38 required to accumulate 2100 ± 43 ºCday to complete its phenological cycle in 118 ± 2 days, while the I-145 05 needs to accumulate 2024 ± 53 ºCday during its phenology which it fulfills in 112 ± 2 days. The greatest variability in the duration of the phenological stages for both varieties occurs between the start of tillering and the formation of the flag leaf.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto de Innovación Agropecuaria de Panamá
2018
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| Online Access: | http://www.revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/7 |
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