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Niveles de contaminación de mercurio, cadmio, arsénico y plomo en subsistemas de producción de la cuenca baja del río Bogotá

Alfaro Rodríguez, Ricardo; García Barros, Edgardo; Montenegro Ramos, Omar (Bogotá : Universidad de Ciencias Aplicadas y Ambientales, 2002, 2002-09)

During 1996 the levels of Mercury (Hg), Cadmium (Cd), Arsenic (As) and Lead (Pb) in the lower basin of the Bogotá River were monitored. This alluvial plain has an altitude of 200 - 400 meters above sea level, an average ...
Zonas homogéneas para manejo específico por sitio en maíz usando un sensor de inducción electromagnética en la sabana de Bogotá

Alfaro Rodríguez, Ricardo; Leiva, Fabio Rodrigo; Gómez, Manuel Iván (Bogotá : Universidad de Ciencias Aplicadas y Ambientales, 2015, 2015-07)

Precision farming aims to improve production taking into account variability of the agricultural system. To do this, homogeneous management zones (HZ) are delimited within the crop field. The use of ...

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Niveles de contaminación de mercurio, cadmio, arsénico y plomo en subsistemas de producción de la cuenca baja del río Bogotá
...
Alfaro Rodríguez, Ricardo | 2002-09

During 1996 the levels of Mercury (Hg), Cadmium (Cd), Arsenic (As) and Lead (Pb) in the lower basin of the Bogotá River were monitored. This alluvial plain has an altitude of 200 - 400 meters above sea level, an average anual precipitation of 1200mm; a temperature of 24°C, and belongs to a sub-humid province that makes necessary the use of supplementary irrigation in any agropecuarian exploitation. The municipalities that belong to this unity are: Girardot, Agua de Dios, Tocaima and Ricaurte. The measurements were done in orderto identify and quantify the toxic heavy metalic elements Hg, Cd, As and Pb in water, soil and in the production subsystems of rice, banana and grass. The measurements were done in twelve farms, bordering Bogotá river. The results show that the elements Cd an As are present in quantities that are beyond the normal or admissible limits established for soil and vegetable tissue (2 mg/Kg and 0,3 mg/Kg); the levels found in irrigation water are considerad within the admissible limits (< 0,01 mg/Kg Cd and < 0.05 mg/Kg As). Pb and Hg showed normal quantities for all the measurments taken (Soil, water and vegetable tissue): nevertheless animal tissue, particulary bovine muscles, showed high levels of Pb and Hg (3679.4pg/Kg and 241,8pg/Kg respectively), wich are over the máximum weekly ingestión admissible (1400 pg Pb and 300 pg Hg). These results confirm an active contamination process , with levels that exceed the máximum admissible limits established by the different international institutions, showing a high risk for animal and human health through food.

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Zonas homogéneas para manejo específico por sitio en maíz usando un sensor de inducción electromagnética en la sabana de Bogotá
...
Alfaro Rodríguez, Ricardo | 2015-07

Precision farming aims to improve production taking into account variability of the agricultural system. To do this, homogeneous management zones (HZ) are delimited within the crop field. The use of electromagnetic induction (EMI) sensors that record apparent electrical conductivity (ECa) allows to identify variations in soil properties and in turn to define quickly and reliably zones with similar characteristics. The research had as objective ZM delimitation for site-specific management (SSM) using an EMI sensor in soils under maize crops (Zea mays L.) at the Sabana de Bogotá. For this, two agricultural fields were chosen in Facatativá and Bojacá, and in them it was measured ECa and soil water content (Wsc). Maps of ECa and Wsc were drawn and three ZM were defined within each field. In these ZM, soil samples were taken for physicochemical laboratory analysis and it was determined plant height, SPAD index at 60 and 120 DDG and crop yield. Statistical analysis was performed with SPSS V22 and SAS V 2.5. The results showed correlations between ECa and content of silt in Bojacá and clay content in Facatativá, and statistically significant differences in maize yields between the ZM. This research highlights the utility of the IM sensor to define ZM for SSM.

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Browsing by Author "Alfaro Rodríguez, Ricardo"

Niveles de contaminación de mercurio, cadmio, arsénico y plomo en subsistemas de producción de la cuenca baja del río Bogotá ﻿

Zonas homogéneas para manejo específico por sitio en maíz usando un sensor de inducción electromagnética en la sabana de Bogotá ﻿

Envíos recientes

Niveles de contaminación de mercurio, cadmio, arsénico y plomo en subsistemas de producción de la cuenca baja del río Bogotá

Zonas homogéneas para manejo específico por sitio en maíz usando un sensor de inducción electromagnética en la sabana de Bogotá

Niveles de contaminación de mercurio, cadmio, arsénico y plomo en subsistemas de producción de la cuenca baja del río Bogotá

Zonas homogéneas para manejo específico por sitio en maíz usando un sensor de inducción electromagnética en la sabana de Bogotá