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Guajiro bean is an important subsistence crop in dry lands of the Colombian Caribbean, where environmental stresses often enhance plant stress and limit crop production. Plant biostimulants improve plant performance under stress conditions; chalcones have not been studied as biostimulants but they are multifunctional molecules that express bioactivity and are involved in the regulation of plant metabolism; therefore, it is convenient to study their properties as biostimulants in agriculture. The aim of this work was to evaluate the effect of the synthetic chalcone 3-(4-nitrophenyl)-1-(pyridin-2-i)-prop-2-en-1-one (CHSNPP) on the early growth of guajiro bean (Vigna unguiculata), under plant growth chamber conditions, to provide evidence for a possible application as a biostimulant. CHSNPP solutions were tested at concentrations of 25, 50, 100 and 150 ppm, and two forms of application were evaluated (foliar spray- AF and immersion - IM of seedlings in the solution). The IM treatment with 25 ppm caused an increase of 321 % in the surface area of roots, with 50 ppm there was an increase of 78 % in the number of nodules formed by symbiosis with native rhizobia present in the soil, in addition to increases of 111 % in biomass and 16 % in the chlorophyll content index -ICC, finally with 150 ppm the number of roots increased up to 82 %; the PA treatment with 150 ppm resulted in increases in leaf area and biomass of 101 % and 137 %. It is concluded that the responses observed in plants treated with CHSNPP are characteristic of the mechanisms of action of some non-microbial biostimulants, which suggests a possible use as a biostimulant in guajiro beans. [ABSTRACT FROM AUTHOR]

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The production of common bean (Phaseolus vulgaris L.) still does not meet the needs of population consumption, given the limitations and low distribution of the technological package that includes several products of international origin that guarantee the management and health of the crop, among which the nutritional requirements are of great importance. The combined effect of different bioactive products on the growth and yield of common bean seeds cultivar 'Buenaventura', was evaluated. The experiment was conducted at the Jucaibama Experimental Station, belonging to the Instituto de Investigaciones Agropecuarias "Jorge Dimitrov", Bayamo municipality, Granma province, during the months of December to March 2015-2016, on a poorly differentiated Fluvisol soil. Four treatments were evaluated (Mycorrhizae, and the combinations QuitoMax + Mycorrhizae and Bayfolan Forte + Mycorrhizae). A randomized block experimental design with three replications was used. The following indicators were evaluated: plant height (cm), stem diameter (cm), root length (cm), number of pods per plant, number of seeds per pod, seed mass (g), 100-seed mass (g) and yield (t ha-1). The data obtained were processed by a double ranked analysis of variance. Multiple comparison of means was performed through Duncan's test for p=0.05. The statistical package Statistica, version 8.0 for Windows was used. The results showed that the combination of Mycorrhiza + QuitoMax increased growth, yield in common bean plants cultivar 'Buenaventura'. [ABSTRACT FROM AUTHOR]

Copyright of Cuadernos de Música, Artes Visuales y Artes Escénicas is the property of Pontificia Universidad Javeriana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Dilemas Contemporáneos: Educación, Política y Valores is the property of Dilemas Contemporaneos: Educacion, Politica y Valores and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Agro Productividad is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of BIOAGRO is the property of Revista BIOAGRO and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to characterize the performance of forage tree and shrub species in semiarid climate, a cut and carry experiment was conducted with Gliricidia sepium, Leucaena leucocephala, Leucaena pallida, Moringa oleifera, Senna siamea and Morus alba, without irrigation. The design was randomized blocks, with four replications, and 12-m2 plots were used. In the summer, L. leucocephala, L. pallida, S. siamea and M. alba produced, as average, more than 12 t of DM per hectare; while in the winter between 9,38 and 11,62 t/ha were obtained, except inM. oleifera (5,49 t/ha). The cutting intervals varied between 62 and 65 days in the summer; while in the winter they increased up to 102 and 117 days in G. sepium andM. oleifera, respectively, and oscillated between 81 and 92 days for the other species. The leaf percentage was higher in the winter and S. siamea stood out (62 and 69 % in the summer and winter, respectively). During the winter a high DM production was obtained, in which G. sepium, M. alba and S. siamea were outstanding (47-50 %). The good performance of these tree and shrub species under semiarid conditions was confirmed, with DM yields higher than 12 t/ha and a stable production during the year. It is recommended to include them in studies with animals in silvopastoral systems and protein banks; as well as to use other planting frames in order to improve their productive potential. [ABSTRACT FROM AUTHOR]

En un suelo ácido (pH ~ 4,9), de baja fertilidad, se estudió una colección de 20 accesiones de Brachiaria brizantha asociadas a Stylosanthes guianensis CIAT-184, con el objetivo de evaluar su comportamiento agronómico durante la etapa de establecimiento. Se utilizaron parcelas de 5 x 4 m, con tres réplicas. Los indicadores medidos y/o estimados fueron: el porcentaje de supervivencia (15, 30 y 45 días), la altura de la planta, la abundancia de hojas, el vigor, las afectaciones provocadas por las plagas y la infestación por enfermedades. Para la interpretación de los resultados se utilizó el análisis de componentes principales. En los primeros 45 días las accesiones CIAT-16317, CIAT-26032, CIAT-16485 y el cv. Mulato alcanzaron los mejores índices de supervivencia (por encima del 90%). Después de los 45 días se detectó una alta variabilidad (90,30%) para las dos primeras componentes. Al agrupar las accesiones se identificó la formación de siete grupos, en algunos de los cuales predominaron individuos de porte alto, y en otros, plantas con buen vigor y hojosidad. De manera general, se puede concluir que hubo un comportamiento aceptable de la asociación entre las accesiones de B. brizantha y S. guianensis CIAT-184, ya que todas --en mayor o menor medida--cumplimentaron la etapa de establecimiento. Se destacaron las accesiones de los grupos IV, V y VII, ya que mostraron resultados positivos (por encima de la media) en dos indicadores de los tres estimados. Se recomienda dar continuidad a la evaluación de la fase de explotación de este germoplasma con animales, de manera tal que sea posible, en el futuro mediato, seleccionar las accesiones más sobresalientes durante todo el periodo experimental. [ABSTRACT FROM AUTHOR]

A mechanism for the modeling of how the sugar cane mill gears functions, formed by five elements: three bars, a sliding and a support, whose degree of mobility is 2, taking into account the presence of two motor sources: the torque applied to the superior gears and the hydraulic pressure that guarantees the positioning of the superior mass. [ABSTRACT FROM AUTHOR]

The article presents the results of a study conducted in the Electric Basic Organization of Jagüey Grande in Matanzas, Cuba on distribution transformers that failed massively. The equipment, which all passed the routine and prototype tests satisfactorily, were installed to feed the irrigation system of a big citric fruit project. Since the problems occurred without indications of contingencies in the electric system, investigators associate the damage to the ferroresonance phenomenon.