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Conductividad capilar de un suelo derivado de cenizas volcánicas
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Resumen. Se presenta la conductividad capilar de un suelo de ceniza volcánica chilena en función del potencial mátrico y el contenido volumétrico de agua. Se encontró un movimiento lento del agua a pesar de la alta retención ...
Suelos volcánicos de Nicaragua, 2: Contenido y distribución de azufre
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
The studied soils are derived from volcanic materials and belong to the Pacific Region of Nicaragua. They have high temperatures (22–37°C) and annual rainfall fluctuations between 900 and 1,900 mm, belonging to the very ...
A design for a low cost multiple use seed drying unit
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Se describe el diseño y la operación de una secadora de usos múltiples La unidad sirve principal-mente para secar las semillas de Cupressus, Alnus y Pinus, pero también se mencionan varias otros usos, como para secar ...
Effect of season on sun drying of cocoa beans in Brazil
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Natural or sun-drying of cocoa beans in Brazil, after fermentation, takes place on a flat, smooth, horizontal platform called a "barcaca." This paper presents the results of an experimental study conducted at the Centro ...
Photosynthetic activity in the mature leaves of Sorghum bicolor as influenced by growth retardants
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Photosynthetic activity was measured in leaves of Sorghum bicolor 'Texas 414 treated with the growth retardants CCC, Alar, and Phosphon-D. The growth retardants increased leaf fresh weight and chlorophyll content by about ...
Herencia de la reacción del frijol común a la infección por el virus del mosaico rugoso
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
The inheritance of the reaction of the common bean (Phaseolus vulgaris L.) plant to bean vagose mosaic vivus (BRMV) was studied through three bean lines. One was immune, another resistant (showing only local lessions), and ...
A preliminary study of the influence of chemical sprays on fruit set and abscission in Robusta coffee (Coffea canephora) Pierre ex Froehner
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Application of 200 ppm of gibberellic acid before anthesis produced some reduction in the percentage of fruit retained 28 days after fruit set but had little effect on the actual percentage of fruit set in Robusta coffee ...
Physiological studies on groundnut plants with boron toxicity, 4: Effect on phosphorus, potassium and calcium
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
The effect of supplying 10 ppm boron to the root medium on the phosphorus, potassium and calcium status of peanut plants ("IMV-2") grown in sand was studied. In Bovo treated plants the phosphorus content of roots and middle ...
Studies on seedlings of Theobroma cacao L., variety F3 Amazon, 2: Distribution of radio-carbon photoassimilated by 43-day-old seedlings under low soil water content
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Las hojas de plántulas de Theobroma cacao L. cv "F3 Amazon" de 43 días de edad contenían 88 por ciento de 14C fotoasimilado dentro de las dos primeras horas de fotosíntesis. Las hojas retenían todavía 4,9 por ciento de la ...
Responses of the cotton plant to variations in the intensities of natural light
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)
Two cotton genotypes (Gossypium hirsutum L.), 'MCU-S' and 'PRS-72', were subjected to variations in full sunlight hours. In both varieties, three hours of daily sunlight delayed bud initiation and reduced growth and yield, ...