Effects of soil and foliar application of soluble silicon on mineral nutrition, gas exchange, and growth of potato plants

Silicon can alleviate biotic and abiotic stresses in several crops, and it has beneficial effects on plants under nonstressed conditions. However, there is still doubt about foliar-applied Si efficiency and Si effects on mineral nutrition, physiological processes, and growth of potato (Solanum tuberosum L.) plants under wellwatered conditions. The objective of this study was to evaluate the effect of soil and foliar application of soluble Si on Si accumulation, nutrients, and pigments concentration as well as gas exchange and growth of potato plants. The experiment was conducted under greenhouse conditions in pots containing 35 dm3 of a Typic Acrortox soil. The treatments consisted of a control (no Si application), soil application of soluble Si (50 mg dm-3 Si), and foliar application of soluble Si (three sprays of 1.425 mM Si water solution, prepared with a soluble concentrate stabilized silicic acid), with eight replications. Both soil and foliar application of Si resulted in higher Si accumulation in the whole plant. Foliar application of Si resulted in the greatest Si concentration in leaves, and soil application increased Si concentration in leaves, stems, and roots. Silicon application, regardless of the application method, increased leaf area, specific leaf area, and pigment concentration (chlorophyll a and carotenoids) as well as photosynthesis and transpiration rates of wellwatered potato plants. However, only soil application increased P concentration in leaves and dry weight of leaves and stems. © Crop Science Society of America.

POPIN: a catalyst for a better international exchange of population information

Analiza las actividades del POPIN, cuyo objetivo es ayudar al establecimiento de nuevos servicios de información y coordinar el intercambio entre los existentes, compatibilizando las tareas para mejorar el flujo de información sobre población y la utilización de las fuentes disponibles. Incluye las recomendaciones de la Cuarta Reunión del POPIN realizada en Beijing entre el 22 y el 25 de octubre de 1986; y una lista descriptiva de sus publicaciones.

Preparation and exchange of audio-visual material for education in science and technology

Contiene informacion sobre el Proyecto III del programa de trabajo del CCCT: preparacion e intercambio de material audiovisual para la educacion sobre los beneficios, limitaciones y peligros del desarrollo en ciencia y tecnologia.

The fiscal impact of trade liberalization and commodity price fluctuation: the case of Dominican Republic, 1980-1998

Includes bibliography

Exchange rate regimes in the Caribbean

This document analyses exchange rate regimes in the Caribbean subregion. Caribbean exchange rate regimes are typified into hard and soft pegs. Hard pegs refer to those arrangements that maintain a constant value of the domestic currency in terms of the currency of a major trading partner. The Organisation of Eastern Caribbean States (OECS); economies established a monetary union in 1983. The Bahamas, Belize and Barbados also fixed the value of their domestic currency in relation to the United States dollar in the middle of the 1970s. Soft pegs are monetary arrangements characterized by a forcefully managed exchange rate. Three countries are included in this category, Guyana, Jamaica and Trinidad and Tobago

Las bolsas de productos básicos de los países desarrollados y las exportaciones de América Latina y el Caribe = The commodity exchange of the developed countries and Latin American and Caribbean exports

Incluye Bibliografía

La bolsa de café, azúcar y cacao y su incidencia en las exportaciones de América Latina y el Caribe = The coffee, sugar and cocoa exchange and its impact on exports from Latin America and the Caribbean

Incluye Bibliografía

Efeitos fisiológicos de fungicidas no desenvolvimento de plantas de melão rendilhado, cultivadas em ambiente protegido

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Fungicidas de efeitos fisiológicos no desenvolvimento de plantas de pimentão enxertadas e não enxertadas sob cultivo protegido

Pós-graduação em Agronomia (Horticultura) - FCA

Exchange and Cooperation Programme CELADE

El informe describe las actividades desarrolladas bajo el Programa de Intercambio y Cooperacion CELADE-Canada II (CCII) durante el periodo enero-marzo de 1989, en sus tres componentes: a) cooperacion tecnica, ensenanza e investigacion, centradas en encuestas demograficas nacionales, encuestas de migracion interna, uso y generacion de informacion en poblacion, estudios integrados sobre poblacion y desarrollo, cursos nacionales sobre la integracion de las variables demograficas en la planificacion, programas de estudios demograficos, cursos sobre tecnicas de analisis demografico, talleres, seminarios y publicaciones; b) intercambio, incluyendo el apoyo a estudiantes latinoamericanos en universidades canadienses, contratacion de personal canadiense y profesores visitantes; c) apoyo a programas, a traves de personal tecnico, servicios de computacion, materiales y equipos.

A first approach to the impact of the real exchange rate on industrial sectors in Colombia

Much has been said about possible symptoms of Dutch disease in Colombia in the wake of a marked upsurge in commodity prices and the significant real appreciation of the national currency. This paper examines whether the real effective exchange rate had an impact on industry during the period 2000-2010. Specifically, it evaluates the effect of the appreciation of the real exchange rate on the value added of 63 industrial sectors in Colombia using the Arellano and Bond (1991) generalized method of moments (gmm) estimator. Overall, our results confirm a negative relationship between real exchange rate appreciation and industry. The analysis showed that real exchange rate appreciation had a significant impact on the value added of 21 sectors: a negative effect for 18 sectors and a positive effect for 3 sectors.