Componentes estruturais do resíduo pós-corte em capim-massai adubado com cinco doses de nitrogênio

Lopes, Marcos Neves; Cândido, Magno José Duarte; Pompeu, Roberto Cláudio Fernandes Franco; Silva, Rodrigo Gregório da; Bezerra, Francisco Marcus Lima

doi:10.1590/s1806-66902011000200035

Cited by 18 publications

(17 citation statements)

References 12 publications

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“…The LBMr was lower than that observed by Emerenciano Neto et al (2013) due to the higher post-grazing height used by the authors, who found 764.1 kg ha -1 DM at 25 cm high. According to Lopes et al (2011), the remaining amount of leaves indicated the level of the animals grazing pressure. Thus, the small amount of remaining leaves indicated that the grazing pressure was high.…”

Section: Resultsmentioning

confidence: 99%

“…Lower participation of the leaf blades in the post-grazing dramatically reduced the photosynthetic rate of plants during regrowth caused by the sharp drop in the reducing sugars represented by the monosaccharides glucose and fructose, which are the first stable organic compounds synthesized by plants during photosynthesis (Alexandrino et al, 2008). According to Lopes et al (2011), the largest leaf blade mass in post-grazing resulted in better regrowth condition for the plants. This decreased the participation of the stem reserves to form new leaves and quickly restored the total non-structural carbohydrates, hence reducing the pasture regrowth period.…”

Section: Resultsmentioning

confidence: 99%

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Sward Structure and Herbage Accumulation of Massai Guineagrass Pastures Managed According to Pre-Grazing Heights, in the Northeast of Brazil

Neto¹,

Difante²,

Lana³

et al. 2017

JAS

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The forage sward height measurement is a practical and potential tool for grazing management. Thus, the objective of this study was to evaluate the structure of pasture and forage accumulation related to sward pre-grazing height of Panicum maximum cv. Massai, before being grazed by sheep. The study was conducted in the Federal University of Rio Grande do Norte, Macaíba, Brazil. The treatments were the pre-grazing sward heights at: 35, 40, 45 and 50 cm. The post-grazing height was 15 cm for all treatments. The interaction between the pre-grazing sward heights and grazing cycles was only statistically significant for light interception (LI) and leaf area index (LAI). The LI had linear and positive effect to the pre-grazing heights in only one of three grazing cycles, with approximately 1% increase in LI for each centimeter grown in the sward. The total forage mass had linear regression, every centimeter increased in height, there was a correspondent dry matter (DM) increase of 187 kg ha -1 in forage mass. There was a linear response between leaf blade mass and dead material with sward height. The post-grazing lowest LI was 29.42% at 42.05 cm high. The lowest amount of LI was 29.42% at 42.05 cm high. The minimum LAI was 0.69. The top DM and mineral matter (MM) accumulation rate were linear and had 58.32 and 20.46 kg ha -1 day -1 MS, respectively. Massai guineagrass grazed by sheep must be handled between 35 and 40 cm high at pre-grazing when associated with post-grazing height of 15 cm.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sward Structure and Herbage Accumulation of Massai Guineagrass Pastures Managed According to Pre-Grazing Heights, in the Northeast of Brazil

Neto¹,

Difante²,

Lana³

et al. 2017

JAS

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“…Additionally, it is possible that the cut of the plants at 15 cm (residue) eliminated the apical meristem of the plants kept at 80 cm, resulting in the death of the tiller, which was evidenced by Lopes et al (2011). The regeneration capacity of leaf tissue is one of the main reasons tropical forages persist after cutting, due to the emission of leaves from the apical meristem, which remain below the cutting and/or grazing height.…”

Section: Resultsmentioning

confidence: 99%

Defoliation height and potassium fertilization of Mulato II grass

Cabral

Pesqueira-Silva

Barros

et al. 2017

SCA

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A pot trial in greenhouse conditions was carried out to identify at which defoliation height Mulato II grass (Urochloa hibrida cv. Mulato II) should be managed and to determine whether potassium fertilization is necessary in soil with high potassium content. The experiment was carried out in a greenhouse in a randomized block design with six treatments and five replications. Treatments consisted of a 3 × 2 factorial arrangement, with three defoliation heights (50, 65, and 80 cm) and with or without potassium maintenance fertilization. The production characteristics and chemical composition of the forage plant were evaluated. There was no interaction effect between defoliation height and fertilization with or without potassium on any of the analyzed variables, except for mineral content in Mulato II grass. The tillers and leaves number, shoot dry matter, leaf+sheath, root system, and residue were influenced by defoliation heights and potassium fertilization, except for the leaf blades and root dry matter, leaf blade/ stem+sheath ratio, and leaves number, which were not influenced by potassium fertilization. Higher shoot dry matter was observed at the heights of 65 and 80 cm; however, comparing these two heights, leaf + sheath dry matter was lower at 65 cm. Regarding the grass's chemical composition, there was an increase in neutral and acid detergent fiber and indigestible neutral detergent fiber contents as the defoliation height increased, which resulted in lower production of potentially digestible dry matter, which can compromise the potential use of the forage by animals. Among evaluated treatments, Mulato II grass defoliation is recommended for a maximum height of 65 cm. Potassium fertilization increases the yield and the potentially digestible dry matter content of Mulato II grass, even when cultivated in soil with high potassium content. teor de potássio. O experimento foi realizado em casa de vegetação, em delineamento experimental em blocos casualizados, com seis tratamentos e cinco repetições, em esquema fatorial 3x2. Os tratamentos consistiram em três alturas de desfolha (50, 65 e 80 cm), sendo cada altura de desfolha avaliada com ou sem adubação de manutenção com potássio. Foram avaliadas as características produtivas e a composição bromatológica da forrageira. As alturas de corte e adubação ou não com potássio não apresentaram efeito de interação para nenhuma das variáveis analisadas, exceto para teor de minerais no capim Mulato II. O perfilhamento, massa seca da parte aérea, colmo + bainha, número de folhas e massa seca de raiz e resíduos foram influenciadas pelas alturas de corte e adubação com potássio, com exceção a massa de lâminas foliares, raiz, relação lâmina foliar/colmo+bainha e número de folhas, que não foram influenciadas pela adubação potássica. Observou-se maior massa seca de parte aérea nas alturas de 65 e 80 cm, contudo, comparando estas duas alturas, houve menor massa seca de colmo+bainha na altura de 65 cm. Em relação à composição bromatológica do capim Mulato II, houve inc...

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“…The greater participation of leaf blades in the forage mass verified in the spring of 2014 and summer of 2015 (Table 2) for both sources of urea was due to the higher frequency of cuts (up to three cuts in the same season) when compared to the others, due to the high temperatures and the increase in the precipitation that favored the growth of the plants, together with the better utilization of the nitrogen fertilizer, accelerating tissue renewal, tillering and production of leaf blades, as highlighted by Lopes et al (2011). The average proportion of leaf blades in relation to the total forage produced in the present experiment (82.0%) was similar to that obtained by Emerenciano Neto et al (2016) and higher than the 63% observed by Emerenciano Neto et al (2013), both for Massai grass.…”

Section: Resultsmentioning

confidence: 97%

Agricultural answers and chemical composition of Massai grass under different nitrogen doses and urea sources

Silva

Carvalho

Morenz

et al. 2018

SCA

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Under the hypothesis that modifying nitrogen sources and doses could increase nitrogen fertilization efficiency and productivity and improve forage quality, this study aimed to evaluate the morphological composition, structural characteristics and chemical composition of Panicum maximum cv. Massai forage cultivated under different urea sources (common and coated with Policote ResumoSob a hipótese de aumento da eficiência da adubação nitrogenada quanto ao uso de diferentes fontes e doses de nitrogênio, aliado à maior produtividade e qualidade da forragem produzida, este trabalho foi conduzido com objetivo de avaliar a composição morfológica, as características estruturais e a composição química da forragem do Panicum maximum cv. Massai, cultivado sob diferentes fontes de 1 Parte da Dissertação de Mestrado do primeiro autor.

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Componentes estruturais do resíduo pós-corte em capim-massai adubado com cinco doses de nitrogênio

Cited by 18 publications

References 12 publications

Sward Structure and Herbage Accumulation of Massai Guineagrass Pastures Managed According to Pre-Grazing Heights, in the Northeast of Brazil

Sward Structure and Herbage Accumulation of Massai Guineagrass Pastures Managed According to Pre-Grazing Heights, in the Northeast of Brazil

Defoliation height and potassium fertilization of Mulato II grass

Agricultural answers and chemical composition of Massai grass under different nitrogen doses and urea sources

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