Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index
Subtropical pastures are an important alternative to increase forage yields to fulfil cattle nutritional requirements. Despite the increasing expansion of these pastures in the semiarid subtropical region of Argentina, there is very little information about their responses to grazing management. T...
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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2021
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| Online Access: | http://hdl.handle.net/20.500.12123/10094 https://onlinelibrary.wiley.com/doi/abs/10.1111/gfs.12451 https://doi.org/10.1111/gfs.12451 |
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| author | Ruolo, Maria Soledad Perez, Hector Eduardo Rodríguez, Adriana Mabel |
| author_browse | Perez, Hector Eduardo Rodríguez, Adriana Mabel Ruolo, Maria Soledad |
| author_facet | Ruolo, Maria Soledad Perez, Hector Eduardo Rodríguez, Adriana Mabel |
| author_sort | Ruolo, Maria Soledad |
| collection | INTA Digital |
| description | Subtropical pastures are an important alternative to increase forage yields to fulfil cattle nutritional requirements. Despite the increasing expansion of these pastures in the semiarid subtropical region of Argentina, there is very little information about
their responses to grazing management. The aim of this study was to evaluate the ef‐fect of different defoliation regimes on morphogenesis, sward structure and leaf area index of one of the most expanded forage species in this region, Chloris gayana Kunth.
A combination of two defoliation frequencies (300 and 500 GDD) and two defolia‐tion intensities (1 and 3 green stubble leaves) was compared by a controlled experi‐ment that comprised 1,500 GDD. Defoliation frequency significantly affected leaf elongation rate (LER) and leaf area index (LAI). Under the high defoliation frequency, LER and LAI resulted almost half than under low defoliation frequency (0.34 ± 0.08 vs. 0.67 ± 0.08 mm·tiller−1·GDD−1; 8.31 ± 2.27 m2/m2 vs. 13.27 ± 1.59 m2/m2, at 300 or 500 GDD respectively), regardless of the intensity. Defoliation frequency or inten‐sity did not affect leaf appearance rate, leaf lifespan, leaf size, number of green leaves per tiller nor tiller density at the end of the experiment. We conclude that to maintain high LER and LAI in Chloris gayana Kunth cv. Épica INTA‐Pemán pastures, defoliation frequency could be of 500 GDD. Since leaf lifespan was 415 ± 110 GDD, under this defoliation frequency, a maximum accumulation of green leaf tissues with very little dead tissues may be achieved. |
| format | info:ar-repo/semantics/artículo |
| id | INTA10094 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| record_format | dspace |
| spelling | INTA100942021-08-24T11:20:44Z Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index Ruolo, Maria Soledad Perez, Hector Eduardo Rodríguez, Adriana Mabel Forrajes Pastoreo Defoliación Forage Grazing Defoliation Chloris gayana Subtropical pastures are an important alternative to increase forage yields to fulfil cattle nutritional requirements. Despite the increasing expansion of these pastures in the semiarid subtropical region of Argentina, there is very little information about their responses to grazing management. The aim of this study was to evaluate the ef‐fect of different defoliation regimes on morphogenesis, sward structure and leaf area index of one of the most expanded forage species in this region, Chloris gayana Kunth. A combination of two defoliation frequencies (300 and 500 GDD) and two defolia‐tion intensities (1 and 3 green stubble leaves) was compared by a controlled experi‐ment that comprised 1,500 GDD. Defoliation frequency significantly affected leaf elongation rate (LER) and leaf area index (LAI). Under the high defoliation frequency, LER and LAI resulted almost half than under low defoliation frequency (0.34 ± 0.08 vs. 0.67 ± 0.08 mm·tiller−1·GDD−1; 8.31 ± 2.27 m2/m2 vs. 13.27 ± 1.59 m2/m2, at 300 or 500 GDD respectively), regardless of the intensity. Defoliation frequency or inten‐sity did not affect leaf appearance rate, leaf lifespan, leaf size, number of green leaves per tiller nor tiller density at the end of the experiment. We conclude that to maintain high LER and LAI in Chloris gayana Kunth cv. Épica INTA‐Pemán pastures, defoliation frequency could be of 500 GDD. Since leaf lifespan was 415 ± 110 GDD, under this defoliation frequency, a maximum accumulation of green leaf tissues with very little dead tissues may be achieved. EEA Manfredi Fil: Ruolo, M.S. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi; Argentina. Fil: Ruolo, M.S. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Forrajes y Manejo de Pasturas; Argentina. Fil: Pérez, H. E. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi; Argentina. Fil: Rodríguez, A. M. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Forrajicultura; Argentina 2021-08-24T11:00:20Z 2021-08-24T11:00:20Z 2019-10-09 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/10094 https://onlinelibrary.wiley.com/doi/abs/10.1111/gfs.12451 0142-5242 https://doi.org/10.1111/gfs.12451 eng info:eu-repograntAgreement/INTA/PNPA-1126072/AR./Desarrollo de cultivares superiores de especies forrajeras para sistemas ganaderos y agricolo-ganaderos de la Argentina. info:eu-repograntAgreement/INTA/PNFOR-1104083/AR./Manejo de sistemas silvopastoriles en bosques nativos. info:eu-repograntAgreement/INTA/CORDO-1262205/AR./Proyecto regional del territorio agrícola ganadero central de la provincia de Córdoba. info:eu-repograntAgreement/INTA/CORDO-1262204/AR./Gestión de la innovación en el territorio del arco noroeste de la provincia de Córdoba. info:eu-repograntAgreement/INTA/PNPA-1126073/AR./Pasturas ecoeficientes y de bajo carbono en ganadería. info:eu-repo/semantics/restrictedAccess application/pdf Grass and Forage Science 74 (4) : 720-727 (December 2019) |
| spellingShingle | Forrajes Pastoreo Defoliación Forage Grazing Defoliation Chloris gayana Ruolo, Maria Soledad Perez, Hector Eduardo Rodríguez, Adriana Mabel Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index |
| title | Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index |
| title_full | Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index |
| title_fullStr | Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index |
| title_full_unstemmed | Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index |
| title_short | Chloris gayana Kunth under different defoliation regimes. Morphogenesis, sward structure and leaf area index |
| title_sort | chloris gayana kunth under different defoliation regimes morphogenesis sward structure and leaf area index |
| topic | Forrajes Pastoreo Defoliación Forage Grazing Defoliation Chloris gayana |
| url | http://hdl.handle.net/20.500.12123/10094 https://onlinelibrary.wiley.com/doi/abs/10.1111/gfs.12451 https://doi.org/10.1111/gfs.12451 |
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