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CARACTERIZACIÓN FÍSICA-QUÍMICA Y BIOLÓGICA DE ENMIENDAS ORGÁNICAS APLICADAS EN LA PRODUCCIÓN DE CULTIVOS EN REPÚBLICA DOMINICANA R.C. Suelo Nutr. Veg.
Pérez,Aridio; Céspedes,Carlos; Núñez,Pedro.
Los beneficios de la aplicación de enmiendas orgánicas en la agricultura son conocidos a nivel mundial; sin embargo, existen muy pocos estudios sobre los contenidos nutricionales y actividad biológica de estos fertilizantes orgánicos. En República Dominicana estas enmiendas son aplicadas en la agricultura hace más de dos décadas; pero no han sido estudiadas. El objetivo de la investigación fue determinar las características física-químicas y microbiológicas de las enmiendas orgánicas de mayor uso en República Dominicana, así como las fuentes utilizadas para su preparación. Las muestras de enmiendas orgánicas fueron recolectadas en las localidades de Jarabacoa, Espaillat, La Vega y Montecristi durante el periodo enero del 2005 a julio 2006. En total se...
Tipo: Journal article Palavras-chave: Propiedades físicas; Químicas; Biológicas; Suelo; Enmiendas orgánicas; Compost.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000300002
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GRAZING MANAGEMENT, AMMONIA AND NITROUS OXIDE EMISSIONS: A GENERAL VIEW R.C. Suelo Nutr. Veg.
Núñez,Pedro; Demanet,Rolando; Matus,Francisco; Mora,Maria de la Luz.
The grazing management of grassland has a direct effect on nitrogen (N) recycling. This is an important reason why management has become an alternative to improve the grassland production and quality, in turn to make it more suitable for the environment. However, the livestock system intensification induces changes in the natural dynamics of the N cycle, accelerating gas emmisions (e.g. ammonia, NH3 and nitrous oxide, N(2)0) and leaching losses from soil under grazing. When the amount of N in the environment increases, there is an impact on smog episodes, global warming, stratospheric ozone depletion, acid rain and eutrophication of fresh water. There are different techniques to evaluate the gases emitted from the soil. This klonowledge is useful to design...
Tipo: Journal article Palavras-chave: Ammonia; Grazing; Management; Nitrogen; Nitrous oxide; Livestock.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300006
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MOVEMENT OF N0(3)-N AND NH4-N IN AN ANDISOL AND ITS INFLUENCE ON RYEGRASS PRODUCTION IN A SHORT TERM STUDY R.C. Suelo Nutr. Veg.
Mora,María de la Luz; Cartes,Paula; Núñez,Pedro; Salazar,Mauricio; Demanet,Rolando.
In acids soils, the use of ammonium fertilizers accelerates the acidification processes and decreases both the production and persistence of the pastures. Nitrogen (N) is the most limiting factor for plant growth in most agricultural systems, but also it is one of the major environmental issues worldwide. In Chile, neither systematic studies in the first period of pasture growth and nor N leaching losses associated have been reported. The aims of this study were: (i) to evaluate the effect of the N sources at increasing rates of application on the yield and quality of ryegrass (Lolium perenne) and (ii) to quantify in the short-term the N potential leaching losses and the pH changes throughout the soil profile under field conditions. A field experiment was...
Tipo: Journal article Palavras-chave: Ammonium; Leaching; Nitrate; Nitrogen; Pasture.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000200005
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