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Precision agriculture is the use and application of new technologies in big and small surface units, taking into account the diversity of the soil, the environmental environment and the needs of the plants in order to manage and optimize the application of inputs (seeds, fertilizers, phytosanitary products, irrigation...) to obtain profitable, quality and environmentally friendly production. About 20 years ago or so, applications of the GPS system (Global Positioning System) were achieved in agriculture to obtain the position using coordinates and the production obtained at each of those points. With the preparation of this data, the first yield maps were represented, and the use of these new systems began to be called "Precision Agriculture." In recent years, with technological advances in computing and new communication networks, very important advances have been obtained, being able to control positioning with errors of less than 1 meter, through DGPS and GIS (Geographic Information Systems). This technology in Cuba is in a completely experimental phase, but it is a fact that performance maps are being obtained and this information can be used by equipment that can be mounted on tractors. [ABSTRACT FROM AUTHOR]

The research belongs to a project approved by the National Energy Program. The objective of the work is to evaluate the protection effect that windbreak curtains can provide to a photovoltaic field located in a rural area, in the face of hurricane force winds, applying Computational Fluid Dynamics (CFD) tools. A windbreaker of Bugambilia (Bougainvillea spectabilis) of 2 and 3 m in height and porosities of 0.56 and 0.79 is simulated. The distribution of wind speeds in the environment of a photovoltaic field sector composed of ten batteries, made up of 10 photovoltaic modules each with an arrangement of 5x2 panels, are determined for different intensities and direction of the winds. Likewise, the aerodynamic loads and the Von Mises stresses acting on the panels are determined. As a result, it is obtained that the curtain provides effective protection to the entire photovoltaic field, preserving the integrity of the solar panels, due to the fact that the maximum dynamic tensions reached do not exceed the permissible loads for winds of up to 56 m / s (200 km / h) coinciding with the upper limits of the wind speed in category III hurricanes of the Saffir Simpson scale. [ABSTRACT FROM AUTHOR]

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Copyright of Ingeniería Agrícola is the property of Instituto de Investigaciones de Ingenieria Agricola 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.)

A research directed to improve the regulation of the different mechanisms of rice combine harvesters, in order to diminishing the grain losses, are carried out in the Agricultural Mechanization Center (CEMA) of the Agrarian University of Havana. As previous step to these studies, it became necessary to characterize the grain losses under production conditions. The experimental investigations were carried out during the mechanical harvesting of rice of the variety “Reforma" in the Agroindustrial Enterprise of Grains located in the town of Amarillas, county Matanzas, using a combine CLAAS-CROP TIGER 30. To evaluate these losses, a methodbased on the use of hollow and blind hoops, was adopted. With these method could be evaluated the pre-harvest grainlosses, as well as those attributable to combine harvester. As a result was obtained that the total losses reached 69,81 kg/ha, that which doesn't represent an excessive loss, if compared with those reported internationally. Also was determined that 42,7% of the losses was attributable to the cut-feeding platform, that includes the action of the reel, what corroborates the high relative weight of the action of the reelon the total losses. [ABSTRACT FROM AUTHOR]