Efecto del agua de la cuenca baja del río cañete en los parámetros germinativos de semilla de lechuga (Lactuca sativa L.) 2019
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Date
2019
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Universidad Nacional de Cañete
Abstract
Las aguas de la cuenca baja del río Cañete, tiene buena apariencia física; sin embargo, ésta debe estar determinada por sus características físicas y químicas, los cuales pueden ser afectadas por el incremento de la población de las urbanizaciones cercanas al río ya que son fuentes de contaminación por descargas de aguas residuales domesticas provenientes de las redes de alcantarillado, por lo que se realizó la investigación con el objetivo de determinar el efecto del agua de la cuenca baja del río Cañete en los parámetros germinativos de semilla de lechuga (Lactuca sativa). Para ello se verificaron los parámetros fisicoquímicos temperatura, conductividad eléctrica, oxígeno disuelto, potencial de hidrogeniones, nitrato, amonio y fósforo total, en 5 estaciones de muestreo: Puente Catapalla, Puente San Jerónimo, Puente Socci, Puente Clarita y Boca de río, luego en el laboratorio se procedió a realizar diluciones en serie, con un factor de dilución recomendado de 0.5, el cual permitió cubrir un amplio intervalo de dilución: 100; 50; 25; 12.5, 6.25% y agua reconstituida (testigo) para observar el efecto en los parámetros germinativos de semillas de lechuga (Lactuca sativa): Crecimiento radicular, elongación del hipocótilo e índice de germinación. La metodología de investigación de post prueba y grupo control en Diseño de Bloques Completos al Azar (DBCA) con 6 tratamientos y 5 bloques. Los resultados demostraron que la estación Puente Clarita obtuvo el índice de germinación y el crecimiento radicular más bajo (62.33% y 36.77% respectivamente). Se concluye que la estación Puente Clarita, mostró una ligera toxicidad (sig.<0.05), a diferencia de las demás estaciones, a pesar que los puntos de muestreo se encontraban expuestos a descargas de agua residual proveniente de los municipios, al determinar los parámetros fisicoquímicos demuestran que están dentro de los límites permisibles de acuerdo Ministerio del Ambiente (MINAM), estos resultados pueden servir como antecedente para llevar un control del grado de toxicidad de las aguas de la cuenca baja del río Cañete.
The waters of the lower basin of the Cañete River have good physical appearance; However, this must be determined by its physical and chemical characteristics, which can be affected by the increase in the population of urbanizations near the river since they are sources of contamination by discharges of domestic wastewater from sewage networks. Therefore, the research was carried out with the objective of determining the effect of water from the lower basin of the Cañete River on the germination parameters of lettuce seed (Lactuca sativa). For this purpose, the physicochemical parameters temperature, electrical conductivity, dissolved oxygen, hydrogen ion potential, nitrate, ammonium and total phosphorus were verified at 5 sampling stations: Puente Catapalla, Puente San Jerónimo, Puente Socci, Puente Clarita and Boca de Río, then In the laboratory, serial dilutions were carried out, with a recommended dilution factor of 0.5, which allowed a wide dilution range to be covered: 100; fifty; 25; 12.5, 6.25% and reconstituted water (control) to observe the effect on the germination parameters of lettuce seeds (Lactuca sativa): Root growth, hypocotyl elongation and germination index. The post-test and control group research methodology in Randomized Complete Block Design (DBCA) with 6 treatments and 5 blocks. The results showed that the Puente Clarita station obtained the lowest germination rate and root growth (62.33% and 36.77% respectively). It is concluded that the Puente Clarita station showed a slight toxicity (sig. <0.05), unlike the other stations, despite the fact that the sampling points were exposed to wastewater discharges from the municipalities, when determining the parameters physicochemicals demonstrate that they are within the permissible limits according to the Ministry of the Environment (MINAM), these results can serve as a background to control the degree of toxicity of the waters of the lower basin of the Cañete River.
The waters of the lower basin of the Cañete River have good physical appearance; However, this must be determined by its physical and chemical characteristics, which can be affected by the increase in the population of urbanizations near the river since they are sources of contamination by discharges of domestic wastewater from sewage networks. Therefore, the research was carried out with the objective of determining the effect of water from the lower basin of the Cañete River on the germination parameters of lettuce seed (Lactuca sativa). For this purpose, the physicochemical parameters temperature, electrical conductivity, dissolved oxygen, hydrogen ion potential, nitrate, ammonium and total phosphorus were verified at 5 sampling stations: Puente Catapalla, Puente San Jerónimo, Puente Socci, Puente Clarita and Boca de Río, then In the laboratory, serial dilutions were carried out, with a recommended dilution factor of 0.5, which allowed a wide dilution range to be covered: 100; fifty; 25; 12.5, 6.25% and reconstituted water (control) to observe the effect on the germination parameters of lettuce seeds (Lactuca sativa): Root growth, hypocotyl elongation and germination index. The post-test and control group research methodology in Randomized Complete Block Design (DBCA) with 6 treatments and 5 blocks. The results showed that the Puente Clarita station obtained the lowest germination rate and root growth (62.33% and 36.77% respectively). It is concluded that the Puente Clarita station showed a slight toxicity (sig. <0.05), unlike the other stations, despite the fact that the sampling points were exposed to wastewater discharges from the municipalities, when determining the parameters physicochemicals demonstrate that they are within the permissible limits according to the Ministry of the Environment (MINAM), these results can serve as a background to control the degree of toxicity of the waters of the lower basin of the Cañete River.
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Efecto del agua en los parámetros germinativos
Citation
Bach. Vicente Paucar, Edwin Guido, "Efecto del agua de la cuenca baja del río cañete en los parámetros germinativos de semilla de lechuga (Lactuca sativa L.) 2019", Tesis para optar el grado de Licenciada en Agronomía, Escuela de pregrado. Facultad de Agronomia. Universidad Nacional de Cañete. Cañete, Perú