Efecto de la esterilización del suelo con vapor de agua sobre semillas de malezas
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Castillo Luna, María del Pilar
Gómez Gómez, Robin
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Abstract
El objetivo del estudio
fue evaluar el efecto de la esterilización de suelo con
vapor de agua sobre la viabilidad de semillas de tres
especies de malezas. El estudio se llevó a cabo en el año
2014 en la Estación Experimental Agrícola Fabio Baudrit
Moreno (EEAFBM) de la Universidad de Costa Rica. Se
evaluaron semillas de las arvenses Poa annua, Polygonum
hydropiperoides y Brassica campestris, comunes en suelos
utilizados para preparar almácigos de hortalizas en las zonas
altas de la provincia de Cartago. Las semillas se ubicaron
a dos profundidades (20 y 40 cm) dentro de un barril con
suelo y se determinó la temperatura en ambas profundidades
y en diferentes intervalos. Se utilizó un diseño experimental
de bloques al azar con tres repeticiones por especie en cada
profundidad. La temperatura se midió una vez que el vapor
de agua atravesó la columna de suelo. La esterilización
continuó por treinta minutos y a partir de ese momento se
tomó nuevamente la temperatura, la cual fue de 99,3 °C en
ambas profundidades y en los dos tiempos evaluados. Se
determinó la viabilidad de las semillas utilizando cloruro
de tetrazolio al 1%. El 100% de las semillas no presentó
viabilidad después de finalizada la esterilización del suelo.
The objective of this study was to evaluate the effect of soil steam sterilization on the viability of seeds of three weed species. The experiment was carried out in 2014 at the Fabio Baudrit Moreno Experiment Station (EEAFBM) of the University of Costa Rica. Weed seeds of Poa annua, Polygonum hydropiperoides, and Brassica campestris, common in soils used to prepare vegetable nurseries in the high lands of Cartago, were evaluated. Weed seeds were placed at two depths (20 and 40 cm) inside a barrel with soil; temperature at both depths and in different intervals was determined. The experimental design was random blocks with three replicates per species per depth. Temperature was measured when steam emerged on top of the soil column. Soil sterilization continued for thirty minutes and then soil temperature was measured again at both depths and intervals, indicating 99.3°C. Seeds viability was determined using tetrazolium chloride (1% v/v). All recovered seeds were non-viable after soil sterilization.
The objective of this study was to evaluate the effect of soil steam sterilization on the viability of seeds of three weed species. The experiment was carried out in 2014 at the Fabio Baudrit Moreno Experiment Station (EEAFBM) of the University of Costa Rica. Weed seeds of Poa annua, Polygonum hydropiperoides, and Brassica campestris, common in soils used to prepare vegetable nurseries in the high lands of Cartago, were evaluated. Weed seeds were placed at two depths (20 and 40 cm) inside a barrel with soil; temperature at both depths and in different intervals was determined. The experimental design was random blocks with three replicates per species per depth. Temperature was measured when steam emerged on top of the soil column. Soil sterilization continued for thirty minutes and then soil temperature was measured again at both depths and intervals, indicating 99.3°C. Seeds viability was determined using tetrazolium chloride (1% v/v). All recovered seeds were non-viable after soil sterilization.
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Keywords
Control de malezas, Poa annua, Malezas en hortalizas, Brassica campestris, Polygonum spp
Citation
https://revistas.ucr.ac.cr/index.php/agromeso/article/view/21286