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Now showing items 21-30 of 215
Microorganismos indicadores de contaminación fecal en la escorrentía de un suelo enmendado con estiércol vacuno
(2013)
Dairy manure application to agricultural soils is a common disposal method of the material that will provide nutrients and organic carbon to the soils, but at the same time adds fecal indicator bacteria (FIB). The effects ...
Efecto de plantas cobertoras sobre las propiedades biológicas y químicas de tres suelos agrícolas de Puerto Rico
(2021-05-13)
Promover salud de suelo en suelos agrícolas es importante cuando se
quiere conservar los recursos naturales. En los últimos años, en Puerto Rico, se ha
evidenciado un aumento en interés en el uso de plantas cobertoras. ...
Mineralización de nitrógeno en suelos bajo agrosistemas de producción de café (Coffea arabica L.) en Puerto Rico
(2008)
The contribution of annual litter and the nitrogen mineralization rates (NMIN) in the field and in the laboratory were quantified. Three ecosystems were evaluated: 1) unshaded coffee (CSL); 2) shaded coffee (CSM), and 3) ...
Evaluación de métodos de propagación de Dioscorea spp. para aumentar la disponibilidad de semilla libre de enfermedades
(2019-05-15)
Yam (Dioscorea spp.) is the most economically important crop within the root and tuber in Puerto Rico. However, only 18 % of the local demand is currently produced on the island. The lack of high-quality disease-free ...
Muestreo e incidencia de moscas del género Anastrepha (Schiner) (Díptera: Tephritidae) en el cultivo de cítricos (Citrus Spp.) en Puerto Rico
(2009)
Fruit flies are considered the most serious problem affecting fruit crops in the world, causing losts of millions of dollars. To evaluate the ocurrence of fruit flies of the genus Anastrepha on various citrus cultivars, ...
Respuesta del arroz (Oryza sativa) a la fertilización nitrogenada en suelos del Valle de Lajas
(2019)
El arroz es uno de los cultivos de grano de mayor importancia mundialmente. En Puerto Rico el arroz es parte de la fuente calórica consumida diariamente y en caso de que se produjera, el mejor manejo de nitrógeno (N) ...
Producción de maíz dulce con leguminosas de cobertura y efectos alelopáticos en cultivos agrónomicos
(2014)
Sustainable agriculture requires the integration of organic matter, crop rotation and association with legumes to reduce the use of inorganic fertilizer. Therefore, three studies were conducted to compare the effects of ...
Fertilizer-nitrogen and cover-crop rotation effects on inbred maize (Zea mays L.) yield and soil quality
(2019-02-05)
This thesis evaluates the effects of fertilizer-nitrogen (N) and cowpea (Vigna unguiculata (L.) Walp.) cover crop (CC) rotation on inbred maize production, microbial community structure and activity and soil quality. The ...
Efecto de los daños causados por trípidos (Thysanoptera: Tripidae) en la severidad de Alternaria allii y Acidovorax avenae subsp. Citrulli en el cultivo de cebolla (Alliium cepa L.) en Puerto Rico
(2007)
Two experiments were conducted to determine the effects of thrips populations in the severity of Alternaria allii under field conditions. Alternaria. allii and Acidovorax avenae subsp. citrulli severity and damage index ...
Bacterias asociadas al cultivo del plátano (Musa sp.) y su relación con el aborto del racimo
(2003)
Plantain production (Musa spp.) in Central, South America and the Caribbean is limited by bacterial diseases. In Puerto Rico, the production of the plantain “Hua Moa” is affected by a disease called bunch abortion or choke ...