&lt;b&gt;Morphogenesis in pastures with Tanzania grass fertilized with nitrogen doses under a grazing system

Filho, Cecílio Viega Soares; Cecato, Ulysses; Ribeiro, Ossival Lolato; Roma, Cláudio Fabrício da Cruz; Beloni, Tatiane

doi:10.4025/actascianimsci.v37i3.27101

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…Research with commercial cultivars Tanzania and Mombasa suggests that plant height of 70–90 cm generates a greater amount of biomass with an adequate recovery of grassland for the next grazing (Carvalho et al., 2017; Soares Filho et al., 2015). In our study, 97% of the collection had plant height >70 cm, and the correlations of plant height with biomass yield superior to .33 show that guineagrass under tropical edaphoclimatic conditions similar to those of the Patía Valley develops desirable agronomic characteristics for the production and maintenance of productive livestock grazing systems.…”

Section: Resultsmentioning

confidence: 99%

Multivariate and multiharvesting trial for agronomic traits in the genetic resources of guineagrass

et al. 2022

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The diversity and use of forages and grasslands for animal feeding are essential in tropical livestock systems. Seasonal changes are mainly marked by variations in precipitation patterns. Grasslands are managed as perennial crops and therefore must be resilient to tolerate both dry and rainy seasons. The integration of animal production with the genetic aspects of forages is important for helping to identify resilient alternatives for sustainability in livestock systems. This study developed a multivariate and multiharvesting trial (MHT) for plant height, green forage weight (GFW), and dry matter yield (DMY) in a diversity panel of 130 accessions of guineagrass [Megathyrsus maximus (Jacq.) B.K. Simon & S.W.L. Jacobs] established in the Patía Valley of Colombia. Our study aims to identify interactions among weather conditions and different genotypes for agronomic variables as well as identify outstanding accessions for their productivity and adaptability. The entry mean heritability values were .88, .47, and .39 for the traits plant height, GFW, and DMY, respectively. The genetic correlations among different harvests ranged .5–.9 for plant height and .2–.9 for GFW. Heritability and genetic correlations suggest that plant height and yield are largely influenced by plant genetic effects. The correlation among plant height and yield was .42 for GFW and .33 for DMY. Negative correlations were not found in the agronomic behavior of the materials among the harvests under rainy and dry conditions. The MHT analyzed under the methodology of factor analysis revealed that accessions 16062 and 6982 stood out consistently for plant height, GFW, and DMY across different harvests. These findings strengthen processes in the search for resilient forages in the transition toward eco‐efficient livestock production and provide knowledge on which agronomic variables and forage materials to select, according to criteria of interest to both producers and plant breeders.

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Section: Resultsmentioning

confidence: 99%

Multivariate and multiharvesting trial for agronomic traits in the genetic resources of guineagrass

et al. 2022

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“…A adubação nitrogenada exerce grande influência nos padrões de alocação de biomassa aérea e radicular das forrageiras. Logo, a aplicação de nitrogênio é uma das formas rápidas de incrementar a produtividade dos pastos, principalmente quando a forrageira é responsiva á adubação, como é o caso da plantas de Panicum maximum (MArtuscello et al, 2009;MArtuscello et al, 2015b ;soAres Filho et al, 2015).…”

Section: Methodsunclassified

Produção de forragem, morfogênese e eficiência agronômica do adubo em capim BRS Quênia sob doses de nitrogênio

Martuscello¹,

Ribeiro²,

Braz³

et al. 2018

Bol. Ind. Anim.

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A adubação nitrogenada modifica os padrões morfogênicos de crescimento das forrageiras. Logo, estudos sobre a resposta de plantas recém lançadas, como a capim BRS Quênia, à adubação podem contribuir sobremaneira com a recomendação estratégias de manejo e doses mais apropriadas do adubo. Objetivou-se com este trabalho avaliar a alocação de biomassa aérea e radicular, resposta morfogênica e a eficiência agronômica da adubação em plantas de Panicum maximum cv. BRS Quênia, sem adubação e adubadas com 50, 100 e 200 mg.dm-3 de nitrogênio. O experimento foi conduzido em casa de vegetação, em delineamento inteiramente casualizado com quatro repetições. As proporções de folha foram maiores que as proporções de colmo, independentemente da adubação nitrogenada. Houve maiores incrementos na produção de parte aérea em detrimento a produção de raiz. O aumento da adubação implicou em menor intervalo entre o surgimento das folhas do capim BRS Quênia, bem como aumentou o número de perfilhos por planta. A medida que se incrementa a adubação nitrogenada há diminuição da eficiência de uso do adubo. A adubação nitrogenada influencia positivamente a produção de forragem em plantas de Panicum maximum BRS Quênia e, independentemente da dose de adubação nitrogenada, a parte aérea funciona como principal dreno de nitrogênio.

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“…Studies with commercial varieties suggest that, at 70-to 90cm height, a higher quantity of biomass is generated with adequate grassland recovery for the next grazing (Soares Filho et al, 2015;Carvalho et al, 2017). In the rainy season, the entire collection reached the mínimum value of the range; whereas, in the dry season, this was obtained only by accessions 16,035,691,6,982,6,960,and 6,915 (Supplementary Material).…”

Section: Productive Measurements and Floweringmentioning

confidence: 99%

Classification of Megathyrsus Maximus Accessions Grown in the Colombian Dry Tropical Forest by Nutritional Assessment During Contrasting Seasons

Carvajal‐Tapia¹,

Mazabel

Quila

2021

Front. Sustain. Food Syst.

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The diversity and use of tropical forages for cattle feeding are the protagonists in livestock systems. The production and nutritional quality of forages represent a strategy of continuous research in animal feeding to help mitigate the environmental impact generated by tropical livestock. The objective of this study was to classify the nutritional behavior in contrasting seasons and the relationship with agronomic traits of a collection of 129 CIAT (Centro Internacional de Agricultura Tropical) accessions of Megathyrsus Maximus established in the Colombian dry tropics. By means of the near-infrared reflectance spectroscopy (NIRS) technique, crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and in vitro dry matter digestibility (IVDMD) were determined under rainy and dry seasons as fixed effects. We measured plant height, dry matter biomass (DMB) and flowering in field. Aspects such as plant height and DMB did not show correlation with nutritional aspects, whereas flowering was correlated with the content of structural carbohydrates. Despite genotype and precipitation affecting nutritional value, there is relative nutritional steadiness in NDF, ADF, and IVDMD between seasons for some accessions. According to the cluster analysis carried out for each season, it was evidenced that from the total collection, 51.2% of the accessions during the dry season and 19.4% of the accessions during the rainy season were classified with a better nutritional profile, thus, showing a higher number of materials with better nutritional behavior in the dry season. Both the genotypic characteristics of M. maximus and environmental conditions during contrasting seasons are factors that might influence the variability of the nutritional content, productive parameters, and flowering. Additionally, fodder material classification under Hotelling's T-squared test and Nutritional Classification Index suggests accessions that might be promising for resilient nutritional quality and adequate DMB, which proves that M. maximus could become an alternative for animal feeding and sustainable livestock production during critical dry periods in tropical agroecosystems.

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<b>Morphogenesis in pastures with Tanzania grass fertilized with nitrogen doses under a grazing system

Cited by 5 publications

References 19 publications

Multivariate and multiharvesting trial for agronomic traits in the genetic resources of guineagrass

Multivariate and multiharvesting trial for agronomic traits in the genetic resources of guineagrass

Produção de forragem, morfogênese e eficiência agronômica do adubo em capim BRS Quênia sob doses de nitrogênio

Classification of Megathyrsus Maximus Accessions Grown in the Colombian Dry Tropical Forest by Nutritional Assessment During Contrasting Seasons

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