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DOI:	https://doi.org/10.48432/LJAPTY
Título:	Stem and pseudostem growth play a key role in biomass accumulation of guineagrass in long regrowth cycles.
Assunto:	Agricultural Sciences
Descrição:	The data presented are from a field experiment conducted in São Carlos-SP to evaluate the stem and pseudostem growth patterns of ‘Mombaça’ guineagrass [Megathyrsus maximus (Jacq.) BK Simon & SWL Jacobs] grown in field conditions and its relationship with biomass accumulation in long regrowth cycles. Plots of ‘Mombaça guineagrass’ were evaluated on three regrowth cycles that occurred from December 2017 to February 2018 (Summer 1), February 2018 to June 2018 (Autumn), and November 2018 to January 2019 (Summer 2), totalling 10, 14, and 12 weeks, respectively. Individual tillers labelled with colored plastic coated wires were assessed weekly to measure leaf elongation, leaf appearance rate and angle of insertion of the leaves. Destructive measures were performed on individual tillers to assess the pseudostem and stem lengths and the developmental phase of the tillers. For that, ten tillers in the summers and 20 tillers in the autumn were split longitudinally to measure the stem (from soil level to the apical meristem) and pseudostem (from apical meristem to the youngest visible ligule) lengths and to classify them as vegetative or reproductive, based on the presence of leaf primordia or an inflorescence primordium, with the aid of a Coleman XTB stereoscopic microscope (Coleman, Santo André, SP, Brazil; 15× magnification). Furthermore, aboveground biomass accumulation, leaf area index, and plant-part composition were assessed by destructive samples, in which the biomass above soil level was clipped within two 0.5 by 1.0 m quadrats. For plant-part composition determination, each biomass sample was subsampled and separated into green leaf (green leaf laminae), green stem + pseudostem, and dead material fractions. The leaf area index determination was performed by scanning the separated green leaf laminae on a model LI-3100 leaf area meter (Li-Cor, Lincoln, NE). The incidence of photosynthetically active radiation (PAR) was measured continuously at soil level using two quantum linear sensors SQ311 (each one with 10 sensors; Apogee, Logan, Utah, USA) positioned between tussocks. To quantify PAR above the canopy and determine light interception, measurements were taken with a CS110 sensor (Apogee, Logan, Utah, USA). Descriptive statistics were used to plot crop development,using means and standard errors over thermal time. When appropriate, models were fitted using the NLIN procedure of SAS, ver. 9.4 (SAS Institute, Cary, NC, USA)] to evaluate morphological/physiological responses. The significance of the fitted models and coefficients was given by the ANOVA and t-test confidence interval, respectively.
Autor(es):	Brunetti, Henrique Oliveira, Ricardo Pezzopane, José Ricardo Pedreira, Bruno Carvalho, Rogério Pedreira, Carlos Santos, Patrícia Menezes
URI:	https://doi.org/10.48432/LJAPTY https://www.redape.dados.embrapa.br/dataset.xhtml?amp;persistentId=doi:10.48432/LJAPTY
Outros identificadores:
Fomento:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior Conselho Nacional de Desenvolvimento Científico e Tecnológico Conselho Nacional de Desenvolvimento Científico e Tecnológico
Número do Projeto:	88882.328650/2019-01 306002/2018-3 205281/2016-0
Termo de uso:
Data:	2-Ago-2024
Data de Disponibilização:	25-Set-2024
Formato:	text/tab-separated-values
Tipo:	Experimentais
Editora / Evento / Instituição:	Bauab Brunetti, Henrique
Idioma :	English
Aparece nas coleções:	Redape – Repositório de Dados de Pesquisa da Embrapa

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