Desempenho de duas gramíneas forrageiras tropicais tolerantes ao estresse hídrico por alagamento em dois solos glei húmicos.

Costa, Michelle Nazare Xavier da

doi:10.11606/t.11.2004.tde-24082004-144438

Cited by 5 publications

(8 citation statements)

References 34 publications

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“…Mulato nas zonas com drenagem deficiente ou imperfeita. Costa (2004) As disponibilidades hídricas, na qual o capimconvert HD364 foi submetido, influenciaram na produção de massa seca de raiz. O tratamento que proporcionou a máxima produção de massa seca das raízes (104,98g vaso O capim-convert HD364 quando submetido ao alagamento e em 100% da máxima retenção de água no solo, apresentou mudanças morfológicas no sistema radicular com ocorrência de raízes adventícias (Figura 7), que promoveram o aumento da superfície de contato entre as raízes e o meio ambiente, podendo ter proporcionando maior absorção de oxigênio pelas plantas.…”

Section: Figura 1 -Leituraunclassified

Desenvolvimento e produção de capim-convert HD364 submetido ao estresse hídrico.

Bonfim-Silva¹,

Silva²,

Schlichting³

et al. 2014

AGRO@MBIENTE

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Resumo -A inserção de novas cultivares ou híbridos de capim no mercado geram expectativas aos pecuaristas, como novas opções para instalação e manutenção de pastos. Sob essas expectativas está o híbrido capim-convert HD364, que foi recentemente lançado no mercado brasileiro. Assim, objetivou avaliar o desenvolvimento e produção de capim-convert HD364 submetido ao estresse hídrico. O experimento foi realizado em casa de vegetação em delineamento experimental inteiramente casualizado. Foram utilizados vasos com 2,5 dm 3 de solo e seis disponibilidades hídricas: 20, 40, 60, 80, 100 e 120% da capacidade máxima de retenção de água no solo, com quatro repetições. A umidade do solo foi mantida pelo método gravimétrico. Foram avaliados altura de plantas; número de folhas, número de perfilhos e índice SPAD (Soil Plant Analysis Development) e o corte das plantas foram realizados rente ao solo 23 dias após a aplicação dos tratamentos para avaliar a massa seca da parte aérea e massa seca de raízes. Todos os resultados foram submetidos a análises de variância e teste de regressão até 5% de probabilidade por meio do programa SISVAR. As disponibilidades hídricas que proporcionam melhor desenvolvimento e produções da gramínea forrageira situaram-se no intervalo entre 78,2 a 92,49% da capacidade máxima retenção de água do solo. O desenvolvimento e produção do capim-convert HD364 é mais prejudicado pelo estresse hídrico por déficit de água (20% da capacidade máxima retenção de água do solo) que por condições de alagamento. Palavras-chave -Alagamento. Disponibilidade hídrica. Forrageira híbrida.Abstract -The introduction of new cultivars or hybrids of grass generate expectations in the market for farmers, and new options for installation and maintenance of pastures. Under these expectations is grass-convert HD364 the hybrid that was recently released in Brazil. This work aimed to evaluate the development and production of grass-convert HD364 subjected to water stress. The experiment was conducted in a greenhouse experimental design, completely randomized in a 2,5 dm 3 pots with soil water availability and six: 20, 40, 60, 80, 100 and 120% retention with capacity of the soil water four replications. Soil moisture was maintained by the gravimetric method. It was evaluated plant height, number of leaves and SPAD index (Soil Plant Analysis Development) and cutting plants at ground level were performed 23 days after treatment application to evaluate the dry mass of shoot and root dry matter. All results were submitted to analysis of variance and regression test at 5% probability through the program SISVAR. Water availability to provide best development and production of grass stood in the range of 78.2 to 92.49% of the maximum water holding capacity of the soil. The development and production of grass-convert HD364 is most affected by water stress and water deficit (20% of maximum water holding capacity of the soil) than by flooding conditions.

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Section: Figura 1 -Leituraunclassified

Desenvolvimento e produção de capim-convert HD364 submetido ao estresse hídrico.

Bonfim-Silva¹,

Silva²,

Schlichting³

et al. 2014

AGRO@MBIENTE

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“…Micronutrient transfer from soils to crops, associated with low natural fertility and the absence of corrective fertilization can lead to soil depletion and hence plant deficiency (Silva et al, 2009). Other factors such as soil pH (Fonseca et al, 2005;Pestana et al, 2014), phosphate overfertilization (Scalco et al, 2014), soil organic matter (SOM) content (Pigozzo et al, 2008), oxi-reduction reactions (Costa, 2004), and soil texture (Pegoraro et al, 2006) may also contribute to decrease the micronutrient availability in soil, leading to diminished crop yields. In this scenario, the assessment of the micronutrient content in both soils and in plants is important for the adoption of fertilization management that enables increases in production (Chaves and Corrêa, 2003).…”

Section: Introductionmentioning

confidence: 99%

Assessing the Content of Micronutrients in Soils and Sugarcane in Different Pedogeological Contexts of Northeastern Brazil

Silva

Biondi

et al. 2019

Rev. Bras. Ciênc. Solo

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Micronutrient research for sugarcane in northeastern Brazil is scarce and most works on this issue date back to the 70's and 80's. The objectives of this study were to assess the available and reserve pools of Fe, Mn, Cu, and Zn in soils cultivated with sugarcane under three geological contexts in northeastern Brazil as well as to diagnose the micronutrient nutritional status of sugarcane grown on these areas in order to identify pedogeological conditions in which micronutrient deficiencies are likely. Results showed that the soils cultivated with sugarcane in the states of Paraíba and Pernambuco posed available and reserve contents of micronutrients related to the parent materials and soil textural classes. The reserve contents of Fe, Mn, Zn, and Cu in all the soil samples analyzed were below the background values established for the region, which indicates a continuous exportation of micronutrients through cultivation. The mean and median contents of Mn, Zn, and Cu in diagnostic leaves of sugarcane were below their respective nutritional optimum ranges recommended to Brazil while Fe contents achieved the crop nutritional requirement. This is the first time such an approach based on pedogeological contexts is used to study the available and reserve pools of micronutrients in soils of Northeast Brazil.

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“…Plants susceptible to water stress show changes in metabolic and physiological processes. Factors as decrease in root conductance and photosynthetic rate are among the first responses to flooding (Baruch, 1994;Costa, 2004). Other changes, in sequence, include decrease in root permeability, alteration in the balance of growth hormones, epinasty of the leaves, chlorosis and abscission, leading to an interruption of the vegetative and reproductive growth (Moura et al, 2008), reducing relative growth rates (RGR).…”

Section: Introductionmentioning

confidence: 99%

“…When plants are subjected to soil flooding, many physiological functions are affected, amongst them; generally an immediate decrease in gaseous exchange with the environment is observed (Queiroz and Dias-Filho, 2003). Hypoxia or anoxia are the main limiting factors which decrease aerobic respiration and the absorption of minerals and water through the roots (Costa, 2004). However, plants under natural or experimental conditions may be submitted to great variations in the availability of oxygen, from normal levels to deficiency (hypoxia) and total absence (anoxia).…”

Section: Introductionmentioning

confidence: 99%

“…Another mechanism of adaptation, in which the plant "avoids" the injuries caused by flooding, is the formation of adventitious roots, as an alternative to reduce the impact. In species adapted to flooded soils, normally stomata do not close and the root metabolism is not much altered by anoxia due to the efficient transport system and oxygen diffusion in the roots of these species (Jackson and Drew, 1984;Costa, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Soil flood tolerance of seven genotypes of Panicum maximum Jacq.

Silva

Laura

Jank

2009

Braz. arch. biol. technol.

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Desempenho de duas gramíneas forrageiras tropicais tolerantes ao estresse hídrico por alagamento em dois solos glei húmicos.

Abstract: A DEUS pela proteção, luz, força e ajudar-me a superar as adversidades encontradas durante esta etapa de minha vida.

Cited by 5 publications

References 34 publications

Desenvolvimento e produção de capim-convert HD364 submetido ao estresse hídrico.

Desenvolvimento e produção de capim-convert HD364 submetido ao estresse hídrico.

Assessing the Content of Micronutrients in Soils and Sugarcane in Different Pedogeological Contexts of Northeastern Brazil

Soil flood tolerance of seven genotypes of Panicum maximum Jacq.

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