Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum
Introduction. The percentage of shade and scarification can influence the germination of Ischaemun rugosum Salisb. Knowledge of these aspects would allow establishment of successful measures for an integrated management of this species. Objective. To compare the influence of different percentages of shade on the germination of scarified and not scarified I. rugosum Salisb. Materials and methods. This experiment was carried out in micro-tunnels during the dry season and the transition to the rainy season, at Fabio Baudrit Moreno Agricultural Experimental Station, Alajuela, Costa Rica, during 2016. In the dry season, the following shade percentages were used 0 %, 30 %, 50 % (green saran), and 100 % (black saran). In the transition to the rainy season, the same percentages of shade were used, but the black saran was changed to 70 % white saran, in both experiments scarified and non-scarified seeds of the weed were used and germination was counted. The data were analyzed with logistic regression and a hypothesis test for the regression coefficients with a significance level of 5 %. Results. In the dry season there was greater germination with non-scarified seeds and 50 % shade. During the transition to the rainy season the highest germination occurred at four days after sowing (dds), under 50 % shade and with scarified seed, and fifteen days after sowing the highest germination (odds ratio 8.67 to 1) occurred with 70 % shade, green saran and scarified seed. Conclusion. Scarification allowed an increase in germination in the transition to the rainy season, not in the dry season. In both seasons there was a positive influence on germination with the shade percentages of 50 % and 70 %.
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Universidad de Costa Rica
2020
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Portuguez-García, Mary Pamela Rodríguez-Ruiz, Ana María Herrera-Murillo, Franklin González-Lutz, María Isabel |
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Portuguez-García, Mary Pamela Rodríguez-Ruiz, Ana María Herrera-Murillo, Franklin González-Lutz, María Isabel Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum |
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Portuguez-García, Mary Pamela Rodríguez-Ruiz, Ana María Herrera-Murillo, Franklin González-Lutz, María Isabel |
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Portuguez-García, Mary Pamela |
| title |
Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum |
| title_short |
Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum |
| title_full |
Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum |
| title_fullStr |
Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum |
| title_full_unstemmed |
Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum |
| title_sort |
influence of shade and scarification on the germination of ischaemum rugosum salisb.: aspectos biológicos de la germinación de ischaemum rugosum |
| description |
Introduction. The percentage of shade and scarification can influence the germination of Ischaemun rugosum Salisb. Knowledge of these aspects would allow establishment of successful measures for an integrated management of this species. Objective. To compare the influence of different percentages of shade on the germination of scarified and not scarified I. rugosum Salisb. Materials and methods. This experiment was carried out in micro-tunnels during the dry season and the transition to the rainy season, at Fabio Baudrit Moreno Agricultural Experimental Station, Alajuela, Costa Rica, during 2016. In the dry season, the following shade percentages were used 0 %, 30 %, 50 % (green saran), and 100 % (black saran). In the transition to the rainy season, the same percentages of shade were used, but the black saran was changed to 70 % white saran, in both experiments scarified and non-scarified seeds of the weed were used and germination was counted. The data were analyzed with logistic regression and a hypothesis test for the regression coefficients with a significance level of 5 %. Results. In the dry season there was greater germination with non-scarified seeds and 50 % shade. During the transition to the rainy season the highest germination occurred at four days after sowing (dds), under 50 % shade and with scarified seed, and fifteen days after sowing the highest germination (odds ratio 8.67 to 1) occurred with 70 % shade, green saran and scarified seed. Conclusion. Scarification allowed an increase in germination in the transition to the rainy season, not in the dry season. In both seasons there was a positive influence on germination with the shade percentages of 50 % and 70 %. |
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Universidad de Costa Rica |
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https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775 |
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oai:portal.ucr.ac.cr:article377752023-06-16T13:45:30Z Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum Influencia de la sombra y la escarificación sobre la germinación de Ischaemum rugosum Salisb.: Aspectos biológicos de la germinación de Ischaemum rugosum Portuguez-García, Mary Pamela Rodríguez-Ruiz, Ana María Herrera-Murillo, Franklin González-Lutz, María Isabel seed dormancy weed biology solar radiation saran dormancia de semillas biología de las malezas radiación solar Introduction. The percentage of shade and scarification can influence the germination of Ischaemun rugosum Salisb. Knowledge of these aspects would allow establishment of successful measures for an integrated management of this species. Objective. To compare the influence of different percentages of shade on the germination of scarified and not scarified I. rugosum Salisb. Materials and methods. This experiment was carried out in micro-tunnels during the dry season and the transition to the rainy season, at Fabio Baudrit Moreno Agricultural Experimental Station, Alajuela, Costa Rica, during 2016. In the dry season, the following shade percentages were used 0 %, 30 %, 50 % (green saran), and 100 % (black saran). In the transition to the rainy season, the same percentages of shade were used, but the black saran was changed to 70 % white saran, in both experiments scarified and non-scarified seeds of the weed were used and germination was counted. The data were analyzed with logistic regression and a hypothesis test for the regression coefficients with a significance level of 5 %. Results. In the dry season there was greater germination with non-scarified seeds and 50 % shade. During the transition to the rainy season the highest germination occurred at four days after sowing (dds), under 50 % shade and with scarified seed, and fifteen days after sowing the highest germination (odds ratio 8.67 to 1) occurred with 70 % shade, green saran and scarified seed. Conclusion. Scarification allowed an increase in germination in the transition to the rainy season, not in the dry season. In both seasons there was a positive influence on germination with the shade percentages of 50 % and 70 %. Introducción. El porcentaje de sombra y la escarificación pueden influir en la germinación de la maleza Ischaemum rugosum Salisb. El conocimiento de estos aspectos permitiría establecer medidas exitosas para un manejo integrado de esta especie. Objetivo. Comparar la influencia de diferentes porcentajes de sombra sobre la germinación de I. rugosum Salisb. escarificadas y no escarificadas. Materiales y métodos. El experimento se realizó en micro túneles en la época seca y en la de transición a lluviosa, en la Estación Experimental Agrícola Fabio Baudrit Moreno, Alajuela, Costa Rica, durante el 2016. En la época seca, se utilizaron los porcentajes de sombra: 0 %, 30 %, 50 %, 70 % (sarán verde) y 100 % (sarán negro). En la transición a lluviosa, se utilizaron los mismos porcentajes, pero se cambió el sarán negro por sarán blanco 70 %; en ambos experimentos se emplearon semillas escarificadas y no escarificadas de la maleza y se contabilizó la germinación. Los datos se analizaron con regresión logística y una prueba de hipótesis para los coeficientes de regresión con un nivel de significancia del 5 %. Resultados. En la época seca hubo mayor germinación con semillas no escarificadas y 50 % de sombra. Durante la transición a época lluviosa la máxima germinación ocurrió a los cuatro días después de siembra (dds), bajo 50 % de sombra y con semilla escarificada, y a los quince días después de siembra la germinación más alta (razón de ventaja 8,67 a 1) ocurrió con 70 % de sombra, sarán verde y semilla escarificada. Conclusión. La escarificación permitió un aumento de la germinación en la época transición a lluviosa, no ocurrió así en la época seca. En ambas épocas hubo influencia positiva en la germinación con los porcentajes de sombra de 50 % y 70 %. Universidad de Costa Rica 2020-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article text/xml text/html application/pdf application/epub+zip audio/mpeg audio/mpeg https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775 10.15517/am.v31i3.37775 Agronomía Mesoamericana; 2020: Agronomía Mesoamericana: Vol. 31, Issue 3 (September-December); 781-792 Agronomía Mesoamericana; 2020: Agronomía Mesoamericana: Vol. 31, Nº 3 (setiembre-diciembre); 781-792 Agronomía Mesoamericana; 2020: Agronomía Mesoamericana: Vol. 31, Issue 3 (September-December); 781-792 2215-3608 1021-7444 spa eng https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775/44066 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775/43898 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775/43899 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775/43900 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775/43901 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/37775/43902 Copyright (c) 2020 Mary Pamela Portuguez |