Moisture deficit and defoliation effects on white clover yield and demography
Moisture stress and high temperatures during the summer are major factors limiting white clover [Trifolium repens L.] productivity in Uruguay. Our objective was to determine the influence of irrigation and defoliation on the growth of white clover. Two white clover cultivars were sown with tall fesc...
| Otros Autores: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Español |
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| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2010Garcia.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
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| 245 | 1 | 0 | |a Moisture deficit and defoliation effects on white clover yield and demography |
| 520 | |a Moisture stress and high temperatures during the summer are major factors limiting white clover [Trifolium repens L.] productivity in Uruguay. Our objective was to determine the influence of irrigation and defoliation on the growth of white clover. Two white clover cultivars were sown with tall fescue [Schedonorus arundinaceus [Schreb.] Dumort = Lolium arundinaceum [Schreb.] Darbysh.] and subjected to three defoliation regimes with and without low volume irrigations during the summer. Dry matter [DM] yield, botanical composition, number of stolons, and volunteer seedlings were recorded for 3 yr. Irrigation was the main factor affecting clover growth. Clover yields under irrigation were 5.0, 7.4, and 6.9 Mg DM ha -1 in the first, second, and third year compared with 3.0, 5.1, and 1.6 Mg DM ha -1 for the same years in the nonirrigated swards. Defoliation frequency did not affect pasture yields in the nonirrigated swards but the more frequent defoliation produced higher yields under irrigation after the second year. Deferring defoliation during summer did not improve clover yield or persistence. Stolons increased during autumn and winter and decreased in spring and summer. White clover declined after the second summer in the nonirrigated swards while irrigation maintained good clover stand and yield. Profuse seedlings emergences were observed but only 1 percent survived, suggesting that they were not a reliable mechanism for persistence. Successful reseeding occurred only at the end of the experiment after a severe drought followed by a long wet season. | ||
| 653 | 0 | |a FESTUCA ARUNDINACEA | |
| 653 | 0 | |a LOLIUM | |
| 653 | 0 | |a TRIFOLIUM | |
| 653 | 0 | |a TRIFOLIUM REPENS | |
| 700 | 1 | |a García, J. A. |9 71932 | |
| 700 | 1 | |9 22554 |a Piñeiro, Gervasio | |
| 700 | 1 | |a Arana, S. |9 71933 | |
| 700 | 1 | |a Santiñaque, F. H. |9 71934 | |
| 773 | |t Crop Science |g Vol.50, no.5 (2010), p.2009-2020 | ||
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| 900 | |a ^tMoisture deficit and defoliation effects on white clover yield and demography | ||
| 900 | |a ^aGarcía^bJ.A. | ||
| 900 | |a ^aPiñeiro^bG. | ||
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| 900 | |a ^aGarcía^bJ. A. | ||
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| 900 | |a ^aArana^bS. | ||
| 900 | |a ^aSantiñaque^bF. H. | ||
| 900 | |a ^aGarcÃa^bJ.A.^tInstituto Nacional de Investigación Agropecuaria, INIA La Estanzuela, Colonia 70000, Uruguay | ||
| 900 | |a ^aPiñeiro^bG.^tIFEVA/Cátedra de EcologÃa, Facultad de AgronomÃa, UBA/CONICET, C1417DSE Buenos Aires, Argentina | ||
| 900 | |a ^aArana^bS.^tFacultad de AgronomÃa, EEMAC, Paysandú, Uruguay | ||
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| 900 | |a Vol. 50, no. 5 | ||
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| 900 | |a Moisture stress and high temperatures during the summer are major factors limiting white clover [Trifolium repens L.] productivity in Uruguay. Our objective was to determine the influence of irrigation and defoliation on the growth of white clover. Two white clover cultivars were sown with tall fescue [Schedonorus arundinaceus [Schreb.] Dumort = Lolium arundinaceum [Schreb.] Darbysh.] and subjected to three defoliation regimes with and without low volume irrigations during the summer. Dry matter [DM] yield, botanical composition, number of stolons, and volunteer seedlings were recorded for 3 yr. Irrigation was the main factor affecting clover growth. Clover yields under irrigation were 5.0, 7.4, and 6.9 Mg DM ha -1 in the first, second, and third year compared with 3.0, 5.1, and 1.6 Mg DM ha -1 for the same years in the nonirrigated swards. Defoliation frequency did not affect pasture yields in the nonirrigated swards but the more frequent defoliation produced higher yields under irrigation after the second year. Deferring defoliation during summer did not improve clover yield or persistence. Stolons increased during autumn and winter and decreased in spring and summer. White clover declined after the second summer in the nonirrigated swards while irrigation maintained good clover stand and yield. Profuse seedlings emergences were observed but only 1 percent survived, suggesting that they were not a reliable mechanism for persistence. Successful reseeding occurred only at the end of the experiment after a severe drought followed by a long wet season. | ||
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