Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities
This study aimed to evaluate the morphogenetic, structural, and productive characteristics of Andropogon gayanus cv. ‘Planaltina’ subjected to different nitrogen fertilization levels and defoliation intensities. The experiment was done in a completely randomized design with a factorial arrangement o...
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Universidade Federal de Uberlândia
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ftdoajarticles:oai:doaj.org/article:2aa7fefa4b03491eb94d492b60443d54 2023-05-15T16:01:47+02:00 Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities Sâmara Stainy Cardoso Sanchês Rosane Cláudia Rodrigues Ricardo Alves de Araújo Clésio dos Santos Costa Ivone Rodrigues da Silva Francisco Naysson de Sousa Santos Marcônio Martins Rodrigues Raphael Ramos Silva 2020-08-01T00:00:00Z https://doaj.org/article/2aa7fefa4b03491eb94d492b60443d54 EN eng Universidade Federal de Uberlândia https://seer-dev.ufu.br/index.php/biosciencejournal/article/view/47944 https://doaj.org/toc/1981-3163 1981-3163 https://doaj.org/article/2aa7fefa4b03491eb94d492b60443d54 Bioscience Journal, Vol 36, Iss 5 (2020) Andropogon gayanus Dry period Rainy period Residue Agriculture S Biology (General) QH301-705.5 article 2020 ftdoajarticles 2022-12-31T07:07:09Z This study aimed to evaluate the morphogenetic, structural, and productive characteristics of Andropogon gayanus cv. ‘Planaltina’ subjected to different nitrogen fertilization levels and defoliation intensities. The experiment was done in a completely randomized design with a factorial arrangement of six nitrogen doses (0, 100, 200, 300, 400, and 500 kg N ha-1) and two defoliation intensities (15 and 30 cm). The production and structure data were grouped into rainy and dry periods, while morphogenesis data were compared only among different fertilization and defoliation intensities. The total dry forage biomass (TDFB), dry mass of leaves (DML), dry mass of stems (DMS), and dead forage dry mass (DFDM) were then determined. In addition to these variables, the morphogenetic characteristics of the plants and the numbers of tillers alive and dead were evaluated. There was no interaction (P>0.05) between the effects of nitrogen fertilization doses and the intensity of defoliation on TDFB, DML, DMS, and DFDM in both of the evaluated phases (rainy and dry). It was also observed that the rates of leaf elongation, leaf appearance, and leaf blade elongation increased with nitrogen fertilization. On the other hand, the culm elongation rate and phyllochron decreased as the dose applied increased. The defoliation intensity did not influence (P>0.05) the morphogenetic characteristics examined, nor did it affect the senescence rate of nitrogen in leaves and number of live leaves per tiller. The number of dead tillers increased linearly during the rainy period. Based on these results, to improve the efficiency of production of gamba grass it is recommended that it be managed with a defoliation intensity of 30 cm and nitrogen fertilization of 286.52 kg N ha-1 year-1. Article in Journal/Newspaper DML Directory of Open Access Journals: DOAJ Articles |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Andropogon gayanus Dry period Rainy period Residue Agriculture S Biology (General) QH301-705.5 |
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Andropogon gayanus Dry period Rainy period Residue Agriculture S Biology (General) QH301-705.5 Sâmara Stainy Cardoso Sanchês Rosane Cláudia Rodrigues Ricardo Alves de Araújo Clésio dos Santos Costa Ivone Rodrigues da Silva Francisco Naysson de Sousa Santos Marcônio Martins Rodrigues Raphael Ramos Silva Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
topic_facet |
Andropogon gayanus Dry period Rainy period Residue Agriculture S Biology (General) QH301-705.5 |
description |
This study aimed to evaluate the morphogenetic, structural, and productive characteristics of Andropogon gayanus cv. ‘Planaltina’ subjected to different nitrogen fertilization levels and defoliation intensities. The experiment was done in a completely randomized design with a factorial arrangement of six nitrogen doses (0, 100, 200, 300, 400, and 500 kg N ha-1) and two defoliation intensities (15 and 30 cm). The production and structure data were grouped into rainy and dry periods, while morphogenesis data were compared only among different fertilization and defoliation intensities. The total dry forage biomass (TDFB), dry mass of leaves (DML), dry mass of stems (DMS), and dead forage dry mass (DFDM) were then determined. In addition to these variables, the morphogenetic characteristics of the plants and the numbers of tillers alive and dead were evaluated. There was no interaction (P>0.05) between the effects of nitrogen fertilization doses and the intensity of defoliation on TDFB, DML, DMS, and DFDM in both of the evaluated phases (rainy and dry). It was also observed that the rates of leaf elongation, leaf appearance, and leaf blade elongation increased with nitrogen fertilization. On the other hand, the culm elongation rate and phyllochron decreased as the dose applied increased. The defoliation intensity did not influence (P>0.05) the morphogenetic characteristics examined, nor did it affect the senescence rate of nitrogen in leaves and number of live leaves per tiller. The number of dead tillers increased linearly during the rainy period. Based on these results, to improve the efficiency of production of gamba grass it is recommended that it be managed with a defoliation intensity of 30 cm and nitrogen fertilization of 286.52 kg N ha-1 year-1. |
format |
Article in Journal/Newspaper |
author |
Sâmara Stainy Cardoso Sanchês Rosane Cláudia Rodrigues Ricardo Alves de Araújo Clésio dos Santos Costa Ivone Rodrigues da Silva Francisco Naysson de Sousa Santos Marcônio Martins Rodrigues Raphael Ramos Silva |
author_facet |
Sâmara Stainy Cardoso Sanchês Rosane Cláudia Rodrigues Ricardo Alves de Araújo Clésio dos Santos Costa Ivone Rodrigues da Silva Francisco Naysson de Sousa Santos Marcônio Martins Rodrigues Raphael Ramos Silva |
author_sort |
Sâmara Stainy Cardoso Sanchês |
title |
Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
title_short |
Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
title_full |
Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
title_fullStr |
Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
title_full_unstemmed |
Morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
title_sort |
morphogenetic and structural characteristics of gamba grass subjected to nitrogen fertilization and different defoliation intensities |
publisher |
Universidade Federal de Uberlândia |
publishDate |
2020 |
url |
https://doaj.org/article/2aa7fefa4b03491eb94d492b60443d54 |
genre |
DML |
genre_facet |
DML |
op_source |
Bioscience Journal, Vol 36, Iss 5 (2020) |
op_relation |
https://seer-dev.ufu.br/index.php/biosciencejournal/article/view/47944 https://doaj.org/toc/1981-3163 1981-3163 https://doaj.org/article/2aa7fefa4b03491eb94d492b60443d54 |
_version_ |
1766397513957376000 |