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Los pequeños productores de subregión de La Mojana han visto disminuida la variabilidad genética de los arroces regionales por la desaparición de estos, ocasionado principalmente por ola invernal 2010-2011. Esto influyó negativamente en su sistema productivo debido a que escaseó la cantidad de semilla de buena calidad para mantener la producción de estos arroces. Durante cinco (5) años, y usando metodologías participativas, se adelantaron actividades de rescate, depuración y conservación de material genético de estos arroces regionales con el fin devolver a los pequeños productores semillas de alta calidad genética, física, sanitaria y fisiológica. Estos materiales poseen alto potencial económico, comprobado en experimentos de campo y pruebas en restaurantes, que evidenciaron su excelente calidad culinaria, mayor valor de venta ($5.000 a $10.000 Kg-1), comparado con el valor de arroz premium ($3.990 Kg-1), y producción en sistemas con bajo uso de agroquímicos. La evaluación realizada por restaurantes gourmet de la región caribe, resalta la calidad y aceptación de materiales genéticos “Guatapuri”, “Fortuna Blanco”, “Guayaquil”, “Ina Mono”, “Ina Blanco” y “Blubone”. Producto de lo anterior, se entregaron a los pequeños productores un total de 4,6 ton de semilla. [ABSTRACT FROM AUTHOR]

The present study was carried out to monitor leaf growth, foliar emission, and the daily photosynthesis behavior of sisal plants cv Ceniza. In a commercial crop, sisal plants were selected and monitored weekly to determine increase in number, length, width, and thickness of the leaves, during a 154 day period. On two occasions during the experimental period, gas exchange rates were also monitored during the light and dark periods. The results allowed determining a phyllochron of 8.65 days. Gas exchange monitoring detected low stomatal conductance rates during the light period. However, starting at 15:30 h, stomatal conductance substantially increased, remaining at maximum levels throughout the dark period, and, subsequently, decreased from 09:30 h, the following light period. A high correlation of stomatal conductance with vapor pressure deficit and leaf temperature was found. Maximum CO2 fixation rates varied between 12.2 and 14.5 µmol m-2 s-1, recorded between 19:19 and 19:26 h. The results corroborate the CAM metabolism of sisal plants cv Ceniza. [ABSTRACT FROM AUTHOR]

Los pequeños productores de subregión de La Mojana han visto disminuida la variabilidad genética de los arroces regionales por la desaparición de estos, ocasionado principalmente por ola invernal 2010-2011. Esto influyó negativamente en su sistema productivo debido a que escaseó la cantidad de semilla de buena calidad para mantener la producción de estos arroces. Durante cinco (5) años, y usando metodologías participativas, se adelantaron actividades de rescate, depuración y conservación de material genético de estos arroces regionales con el fin devolver a los pequeños productores semillas de alta calidad genética, física, sanitaria y fisiológica. Estos materiales poseen alto potencial económico, comprobado en experimentos de campo y pruebas en restaurantes, que evidenciaron su excelente calidad culinaria, mayor valor de venta ($5.000 a $10.000 Kg-1), comparado con el valor de arroz premium ($3.990 Kg-1), y producción en sistemas con bajo uso de agroquímicos. La evaluación realizada por restaurantes gourmet de la región caribe, resalta la calidad y aceptación de materiales genéticos "Guatapuri", "Fortuna Blanco", "Guayaquil", "Ina Mono", "Ina Blanco" y "Blubone". Producto de lo anterior, se entregaron a los pequeños productores un total de 4,6 ton de semilla. [ABSTRACT FROM AUTHOR]

The growing degree-days (GDD) provide an estimate of the accumulated thermal energy available for the development of a crop. The use of GDD allows measuring the heat requirements associated with the phenological stages of the crop, which allows in turn, to predict when a certain plant stage will occur knowing the daily temperatures. The aim of this study was to establish relationships among the effect of degree days (DD) to vegetative growth, first flowering and fructification (VG, Fl and Fr), on total yield per plant (TY/P) of eggplant grown under open-field conditions employing a randomized complete block design with 15 genotypes and four replicates. The results showed that: 1) The genotypes that initiated fruit production in less time required fewer GDD (892.14-1,077.71 °C) for this phenological phase, obtaining higher productivity. 2) The genotypes C035 and C040 had an average yield higher than the national average with values of 83.75 and 84.86 t ha-1, being identified as future varieties to be produced in the Caribbean region. 3) The Caribbean region is suitable for the establishment of the crop as there were no events with limiting temperatures for this species (higher than 35 °C and lower than 15 °C). 4) The principal component analysis showed associations among the variable YT/P with the genotypes C011, C042, and C015; meanwhile, C032, C025, and C028 were associated with the variables DD to VG, Fl, and Fr. These results would be useful in developing a model to estimate yield with DD. [ABSTRACT FROM AUTHOR]