INIA CENIAP

Maracay, Venezuela

INIA CENIAP

Maracay, Venezuela
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Rey J.C.,INIA CENIAP | Rodriguez M.F.,INIA CENIAP | Cortez A.,INIA CENIAP | Lobo D.,Central University of Venezuela | And 3 more authors.
Bioagro | Year: 2012

The distribution and aggressiveness of the precipitation in Los Andes region of Venezuela was evaluated by analyzing monthly precipitation data from 56 meteorological stations. The modified Fournier index (FMI) and precipitation concentration index (PCI) were calculated to assess rain aggressiveness and rain distribution, respectively. The index values were analyzed using univariate and geostatistical analysis adjusting semivariograms to theoretical models. For mapping of the spatial distribution of indices punctual kriging interpolation method was carried out, generating the appropriate file, which was finally edited in ArcView. The results pointed out that the region under study has high and very high rainfall aggressiveness over 70% of the entire territory, while the distribution of rainfall was moderately seasonal. Rainfall aggressiveness, in combination with the predominance of a sloped relief increases the risks of soil degradation, with the annual rainfall ranging from 500 to 3900 mm. In this sense, soil conservation practices should be considered on existing crop production systems in the evaluated region.


Rodriguez M.F.,INIA CENIAP | Cortez A.,INIA CENIAP | Rey J.C.,INIA CENIAP | Lobo D.,Central University of Venezuela | And 4 more authors.
Bioagro | Year: 2011

In order to evaluate the distribution and aggressiveness of the precipitation in the Southeast region of Venezuela (Guayana and the Orinoco Delta), we performed an analysis of monthly precipitation data from 41 meteorological stations, and the Precipitation Concentration Index (PCI) and Modified Fournier Index (MFI) were calculated. The index values were evaluated using univariate and geostatistical analysis, adjusting semivariograms to theoretical models. For mapping the spatial distribution of the indices, interpolation by punctual kriging method was carried out, generating the appropriate file, which was edited in ArcView. It was found that rainfall has a very high aggressiveness (values of MFI classified as very high). The distribution of rainfall was moderately seasonal in 91 % of the entire territory, and only in the Northwestern of Amazonas State and Central North of Bolivar State, precipitation presented a seasonal distribution. It is concluded that soils of most part of the region are greatly vulnerable to erosion by effect of rainfall.


Lobo D.,Central University of Venezuela | Cortez A.,INIA CENIAP | Rodriguez M.F.,INIA CENIAP | Ovalles F.,INIA CENIAP | And 3 more authors.
Bioagro | Year: 2010

The delineation of zones with different precipitations can be considered as basis for sustainable land use and management. With the objective to evaluate the aggressiveness and concentration of the precipitation in Los Llanos region of Venezuela, monthly precipitation data coming from 96 weather stations were analyzed by calculating the modified Fournier index (MFI) and the precipitation concentration index (PCI). The values were subjected to univariated and geostatistical analysis. For mapping the precipitation variable, kriging was used for interpolation and the results edited with ArcView. It was found that a zone with high precipitation concentration and aggressiveness exists in the center of the study area, including the central-south region of Guárico State, the West part of Anzoátegui State and the East part of the Apure and Barinas States, while in the rest of the area a combination of moderate seasonal precipitation with high to very high rain aggressiveness can be considered.


Gonzalez J.,Instituto Nacional Of Investigaciones Agricolas Inia | Hernandez G.,INIA CENIAP | Messia O.,Instituto Nacional Of Investigaciones Agricolas Inia | Perez A.,Instituto Nacional Of Investigaciones Agricolas Inia
Zootecnia Tropical | Year: 2010

Inoculation of exogenous gonadotropin and other substances, to reactivate the reproductive cycle of species of commercial interest, not able to spawn in captivity, warrants today the purchase of expensive imported inducing agents. Therefore, it is essential to assess the biological potential of native pituitary, in the reproduction of fish species of commercial interest. The Coporo for its ease of cultivation, early reproductive and phylogenetic relationship, was selected as a kind of pituitary donor. The study included the preparation and maintenance of donors in ponds, with the purpose of determining gonosomatic index; pituitary extraction, drying, storage and testing of the material. To measure the biological effects, using circular tanks of 3.000 l, with 3 females and 3 males Coporo, with the application of two treatments, a control and four repetitions: The first consisted of inoculation pituitary carp (2 mg kg-1), the second of pituitary coporo (2 mg kg-1) and the physiological serum (1 ml). They were extracted and stored, a total of 107 glands of 127 used, with a loss of 15%. The results of bioassays showed that the two treatments inductors with hormonal extracts were positive in terms of reproductive efficiency, and do not differ significantly (P = 0,05). In conclusion it is feasible to replace the imported material hormone as an agent of carp inductor of reofilic species by pituitary extracts homoplásticos induced in the reproduction of the Coporo.

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