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Niveles productivos y nutricionales de los pequeños productores de la comunidad de Ojo de Agua (Matagalpa) VI region, Nicaragua = | Productive and nutritional level of small farmers in the community Ojo de Agua
1990
Carracedo, Isabel Browaldh
[Water sources and pollutants: health risks] | Fuentes de agua y contaminantes: riesgos para la salud
1990
Agrociencia: Serie Agua-suelo-clima
1990
Fernadez Gonzalez, A.
Fertirrigação - adubação via água de irrigação. Full text
1990
PINTO, J. M. | SOARES, J. M.
No sentido de gerar tecnologias para areas irrigadas, o Centro de Pesquisa Agropecuaria do Tropico Semi-Arido (CPATSA) - EMBRAPA vem desenvolvendo pesquisas visando solucionar os problemas e definir criterios tecnicos da aplicacao de fertilizantes atraves de sistema de irrigacao. Este trabalho aborda consideracoes gerais, vantagens da fertirrigacao, limitacoes, equipamentos de injecao de fertilizantes, tecnicas de fertirrigacao, tipos de fertilizantes (liquidos e solidos), elementos nutritivos e manejo da fertirrigacao.
Show more [+] Less [-]Water interchange between the Ría of Vigo and the coastal shelf | Intercambio de agua entre la Ría de Vigo y la plataforma continental Full text
1990
Prego, R. | Fraga, Fernando | Ríos, Aida F. | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
6 pages, 5 figures, 4 tables. | [EN] In this paper the water interchange between the Ria of Vigo and the coastal shelf is discussed from the points of view both of salinity and of the fresh water contribution from the drainage basin. In winter the results show a typical estuarine circulation, produced by the great quantity of fresh water running into Ria. This factor causes flows of arount 2 X 106 kg s-1; 2 m day-1 upward movement of sea water, and a speed of 3 km day-1 for the estuarine residual current in the outlet of the Ria. In summer these values decrease to about one sixth of the winter values, although there is an increase in the circulation of up to 1 X 106 kg s-1 , the consequence of upwelling produced by north winds over the shelf. Later the south winds produce the opposite effect, blocking interchange with the shelf. The mixing of water in the Ria is greater in summer, favouring the arrival and recycling of nutrient salts in the area. | [ES] Se calcula el intercambio de agua entre la ría de Vigo y la plataforma continental a partir de la salinidad y de los aportes de agua dulce desde la cuenta hidrológica. Los resultados manifiestan una circulación típicamente estuárica en invierno, que es causada por la alta cantidad de agua dulce vertida a la Ría. La mezcla de agua en la Ría aumenta según avanza la estación favoreciendo el reciclado y la llegada de sales nutrientes a la zona fótica. | Peer reviewed
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