Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities
ABSTRACT The objective of this study was to evaluate the morphogenic and structural characteristics, and demographic patterns of Andropogon gayanus subjected to different cutting frequencies and intensities. A completely randomized design was adopted in a 3 × 2 factorial arrangement, corresponding to three cutting heights (50, 70, and 90 cm), and two cutting intensities (50 and 70%) with four repetitions, totaling 24 plots of 7.50 × 6.25 m. For morphogenesis, there was no interaction effect (P ≤ 0.05) of treatments on stem elongation rate, leaf appearance rate, and phyllochron rate. The highest rate of leaf elongation was observed at a height of 90 cm and cut intensity of 50%, with 1.69 and 0.84 cm tiller-1 d-1 of leaf elongation at heights of 50 and 70 cm, respectively. For forage production, there was no interaction (p > 0.05) between cutting intensity and cutting height. When the pasture was managed to a cutting height of 90 cm, there was a greater increase in dry leaf mass, stalk dry mass, dead forage dry mass, and total dry forage mass, which was 50.89% and 53.29% higher than pasture heights of 50 and 70 cm, respectively. There was no interaction between factors on demographic characteristics (p > 0.05). A cutting height of 70 cm with a cutting intensity of 50% is recommended when handling this grass.
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Departamento de Engenharia Agrícola - UFCG
2020
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oai:scielo:S1415-436620200009006102020-08-19Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensitiesLima,Juliana R. L.Rodrigues,Rosane C.Sousa,Giovanne O. C.Costa,Clésio dos S.Parente,Henrique N.Santos,Francisco N. de S. Andropogon gayanus cutting height morphogenic characteristics forage production ABSTRACT The objective of this study was to evaluate the morphogenic and structural characteristics, and demographic patterns of Andropogon gayanus subjected to different cutting frequencies and intensities. A completely randomized design was adopted in a 3 × 2 factorial arrangement, corresponding to three cutting heights (50, 70, and 90 cm), and two cutting intensities (50 and 70%) with four repetitions, totaling 24 plots of 7.50 × 6.25 m. For morphogenesis, there was no interaction effect (P ≤ 0.05) of treatments on stem elongation rate, leaf appearance rate, and phyllochron rate. The highest rate of leaf elongation was observed at a height of 90 cm and cut intensity of 50%, with 1.69 and 0.84 cm tiller-1 d-1 of leaf elongation at heights of 50 and 70 cm, respectively. For forage production, there was no interaction (p > 0.05) between cutting intensity and cutting height. When the pasture was managed to a cutting height of 90 cm, there was a greater increase in dry leaf mass, stalk dry mass, dead forage dry mass, and total dry forage mass, which was 50.89% and 53.29% higher than pasture heights of 50 and 70 cm, respectively. There was no interaction between factors on demographic characteristics (p > 0.05). A cutting height of 70 cm with a cutting intensity of 50% is recommended when handling this grass.info:eu-repo/semantics/openAccessDepartamento de Engenharia Agrícola - UFCGRevista Brasileira de Engenharia Agrícola e Ambiental v.24 n.9 20202020-09-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000900610en10.1590/1807-1929/agriambi.v24n9p610-615 |
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Lima,Juliana R. L. Rodrigues,Rosane C. Sousa,Giovanne O. C. Costa,Clésio dos S. Parente,Henrique N. Santos,Francisco N. de S. |
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Lima,Juliana R. L. Rodrigues,Rosane C. Sousa,Giovanne O. C. Costa,Clésio dos S. Parente,Henrique N. Santos,Francisco N. de S. Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities |
author_facet |
Lima,Juliana R. L. Rodrigues,Rosane C. Sousa,Giovanne O. C. Costa,Clésio dos S. Parente,Henrique N. Santos,Francisco N. de S. |
author_sort |
Lima,Juliana R. L. |
title |
Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities |
title_short |
Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities |
title_full |
Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities |
title_fullStr |
Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities |
title_full_unstemmed |
Ecophysiology of Andropogon grass subjected to different cutting frequencies and intensities |
title_sort |
ecophysiology of andropogon grass subjected to different cutting frequencies and intensities |
description |
ABSTRACT The objective of this study was to evaluate the morphogenic and structural characteristics, and demographic patterns of Andropogon gayanus subjected to different cutting frequencies and intensities. A completely randomized design was adopted in a 3 × 2 factorial arrangement, corresponding to three cutting heights (50, 70, and 90 cm), and two cutting intensities (50 and 70%) with four repetitions, totaling 24 plots of 7.50 × 6.25 m. For morphogenesis, there was no interaction effect (P ≤ 0.05) of treatments on stem elongation rate, leaf appearance rate, and phyllochron rate. The highest rate of leaf elongation was observed at a height of 90 cm and cut intensity of 50%, with 1.69 and 0.84 cm tiller-1 d-1 of leaf elongation at heights of 50 and 70 cm, respectively. For forage production, there was no interaction (p > 0.05) between cutting intensity and cutting height. When the pasture was managed to a cutting height of 90 cm, there was a greater increase in dry leaf mass, stalk dry mass, dead forage dry mass, and total dry forage mass, which was 50.89% and 53.29% higher than pasture heights of 50 and 70 cm, respectively. There was no interaction between factors on demographic characteristics (p > 0.05). A cutting height of 70 cm with a cutting intensity of 50% is recommended when handling this grass. |
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Departamento de Engenharia Agrícola - UFCG |
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2020 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000900610 |
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