Effect of cultivar mixture on the competitive ability of barley against weeds
While it is known that mixtures of cultivars generally stabilise crop yields and reduce losses caused by diseases, their influence on weeds has not yet been thoroughly investigated. Competitive effects against weeds are dependent on specific plant characteristics, which can vary between cultivars. T...
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| Formato: | Otro |
| Lenguaje: | sueco Inglés |
| Publicado: |
2006
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| Acceso en línea: | https://stud.epsilon.slu.se/11940/ |
| _version_ | 1855571969941962752 |
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| author | Estevan Rodríguez, Eva |
| author_browse | Estevan Rodríguez, Eva |
| author_facet | Estevan Rodríguez, Eva |
| author_sort | Estevan Rodríguez, Eva |
| collection | Epsilon Archive for Student Projects |
| description | While it is known that mixtures of cultivars generally stabilise crop yields and reduce losses caused by diseases, their influence on weeds has not yet been thoroughly investigated. Competitive effects against weeds are dependent on specific plant characteristics, which can vary between cultivars. The aim of this study was to investigate whether mixtures of barley cultivars with different characteristics could suppress weeds better than barley grown in pure stands, and whether the weed suppressive effect differed between the mixtures.
A greenhouse trial was performed with three two-rowed spring barley (Hordeum vulgare L. spp. vulgare) cultivars grown in pure stands, all possible two-cultivar mixtures and the three-cultivar mixture. The barley cultivars Hydrogen, Henni and Troon were chosen because they differ in the three characteristics allelopathic activity, root length development and shoot length in the first growth stages. Turnip rape (Brassica rapa cv. Agat) and perennial ryegrass ( Lolium perenne cv. Helmer) were chosen as model weed flora.
The results indicate that cultivar mixtures can improve the competitive ability of
barley, reducing biomass production by weeds and diminishing barley biomass losses. Contrasting allelopathic activity and shoot development characteristics in the mixture increased the competitive effect. The weed suppressive effect differed between mixtures and was lowest in the mixture with differing root development but low shoot development and high allelopathic activity. Mixtures did not express the sum of characteristics of each individual barley cultivar. In fact, on some occasions the mixture that showed the best competitive ability did not contain the cultivar that demonstrated the best competitive ability when grown in pure stand. The mixtures that included cv. Hydrogen, which has high allelopathic activity, improved the competitive response in terms of barley biomass.
Mixture design is needed to get cultivar mixtures that can control weeds. More research is needed on this aspect to devise a formula that allows us to design correct mixtures, and therefore to use cultivar mixing as a method for controlling weeds. |
| format | Otro |
| id | RepoSLU11940 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2006 |
| publishDateSort | 2006 |
| record_format | eprints |
| spelling | RepoSLU119402018-10-09T11:47:14Z https://stud.epsilon.slu.se/11940/ Effect of cultivar mixture on the competitive ability of barley against weeds Estevan Rodríguez, Eva Weeds and weed control While it is known that mixtures of cultivars generally stabilise crop yields and reduce losses caused by diseases, their influence on weeds has not yet been thoroughly investigated. Competitive effects against weeds are dependent on specific plant characteristics, which can vary between cultivars. The aim of this study was to investigate whether mixtures of barley cultivars with different characteristics could suppress weeds better than barley grown in pure stands, and whether the weed suppressive effect differed between the mixtures. A greenhouse trial was performed with three two-rowed spring barley (Hordeum vulgare L. spp. vulgare) cultivars grown in pure stands, all possible two-cultivar mixtures and the three-cultivar mixture. The barley cultivars Hydrogen, Henni and Troon were chosen because they differ in the three characteristics allelopathic activity, root length development and shoot length in the first growth stages. Turnip rape (Brassica rapa cv. Agat) and perennial ryegrass ( Lolium perenne cv. Helmer) were chosen as model weed flora. The results indicate that cultivar mixtures can improve the competitive ability of barley, reducing biomass production by weeds and diminishing barley biomass losses. Contrasting allelopathic activity and shoot development characteristics in the mixture increased the competitive effect. The weed suppressive effect differed between mixtures and was lowest in the mixture with differing root development but low shoot development and high allelopathic activity. Mixtures did not express the sum of characteristics of each individual barley cultivar. In fact, on some occasions the mixture that showed the best competitive ability did not contain the cultivar that demonstrated the best competitive ability when grown in pure stand. The mixtures that included cv. Hydrogen, which has high allelopathic activity, improved the competitive response in terms of barley biomass. Mixture design is needed to get cultivar mixtures that can control weeds. More research is needed on this aspect to devise a formula that allows us to design correct mixtures, and therefore to use cultivar mixing as a method for controlling weeds. Se sabe que mezclando variedades generalmente se estabiliza la adaptabilidad, la producción y las pérdidas del cultivo debidas a enfermedades, pero la influencia de la mezcla de variedades sobre las malas hierbas apenas ha sido investigada. Los efectos competitivos sobre las malas hierbas varían según las características de las plantas y las características varían según los cultivares. El estudio persigue determinar si la mezcla de variedades de cebada podrían reprimir mejor las malas hierbas que cultivando la cebada en una sola variedad, y si el efecto represivo sobre las malas hierbas difiere entre las mezclas. Se realizó un experimento de invernadero con tres variedades de cebada de primavera (Hordeum vulgare L. spp. vulgaris) cultivadas en líneas puras, mezclas de dos variedades y mezclas de las tres variedades. Las variedades de cebada (Hydrogen, Henni, Troon) fueron seleccionadas según sus características de tolerancia a las malas hierbas: alta capacidad alelopática, gran desarrollo radical y gran alargamiento del vástago en los primeros estados de desarrollo. Como modelo de flora de malas hierbas fueron elegidas dos especies: Brassica rapa cv. Agat y Lolium perenne cv. Helmer. Los resultados indican que la mezcla de variedades puede mejorar la capacidad competitiva en la cebada, reduciendo la biomasa producida por las malas hierbas y disminuyendo las pérdidas en biomasa de la cebada. La competencia se aumenta contrastando las características de actividad alelopática y el desarrollo del vástago en las mezclas. La represión sobre las malas hierbas difería entre las mezclas y fue menor en la mezcla con plantas de gran desarrollo de la raíz, bajo desarrollo del vástago y alta actividad alelopática. Las mezclas no muestran la suma de los efectos de las características de cada variedad de cebada individualmente. De hecho, en algunas ocasiones la variedad con mejor capacidad competitiva en monocultivo no compone la mezcla con mejor capacidad competitiva. Las mezclas que contenían el cultivar Hydrogen de alta actividad alelopática, mejoraron la respuesta competitiva en biomasa de cebada. Se necesita mayor investigación que permita deducir una fórmula para diseñar correctamente las mezclas y que estas puedan ser utilizadas como método de control de malas hierbas. 2006-12-14 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/11940/1/rodriguez_e_171115.pdf Estevan Rodríguez, Eva, 2006. Effect of cultivar mixture on the competitive ability of barley against weeds. UNSPECIFIED, Uppsala. Uppsala: (NL, NJ) > Dept. of Crop Production Ecology <https://stud.epsilon.slu.se/view/divisions/OID-500.html> urn:nbn:se:slu:epsilon-s-8838 eng |
| spellingShingle | Weeds and weed control Estevan Rodríguez, Eva Effect of cultivar mixture on the competitive ability of barley against weeds |
| title | Effect of cultivar mixture on the competitive ability of barley against weeds |
| title_full | Effect of cultivar mixture on the competitive ability of barley against weeds |
| title_fullStr | Effect of cultivar mixture on the competitive ability of barley against weeds |
| title_full_unstemmed | Effect of cultivar mixture on the competitive ability of barley against weeds |
| title_short | Effect of cultivar mixture on the competitive ability of barley against weeds |
| title_sort | effect of cultivar mixture on the competitive ability of barley against weeds |
| topic | Weeds and weed control |
| url | https://stud.epsilon.slu.se/11940/ https://stud.epsilon.slu.se/11940/ |