Nitrogen and potassium supply and the morphogenic and productive characteristics of marandu palisadegrass

Megda, Márcio Mahmoud; Monteiro, Francisco Antônio

doi:10.1590/s1516-35982010000800007

Cited by 10 publications

(19 citation statements)

References 16 publications

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“…The results for root surface and length of signal grass showed similar effects as both were significantly influenced by nitrogen rates. Batista & Monteiro (2006), Monteiro & Consolmagno Neto (2008) and Megda & Monteiro (2010) found that root length and surface were adequate attributes for the development of root system evaluation.…”

Section: Resultsmentioning

confidence: 99%

Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

et al. 2011

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-The objective of this research was to evaluate the effect of combinations of nitrogen and sulfur rates in degraded signal grass (Brachiaria decumbens) pasture on their productive, morphological and nutritional attributes in the root system at four soil depths. The pasture used in the experiment was established over eight years ago in Entisol. Five nitrogen rates (0; 150; 300; 450 and 600 kg/ha/year) and five sulfur rates (0; 15; 30; 45 and 60 kg/ha/year) were combined in a fractionated factorial in a randomized block design, with three replications. Nitrogen was supplied as ammonium nitrate and sulfur as gypsum, and the rates were split into three times in the rainy season. The evaluations occurred at intervals of 35 days during the rainy season and 56 days in the dry season, in two consecutive years. Roots were collected with a 4-cm diameter auger at 0-10; 10-20; 20-30 and 30-40 cm soil depths. It was determined root dry matter, length and surface of the root system and nitrogen and sulfur concentrations in roots. Nitrogen rates applied in two consecutive years in the pasture affected dry mass, length, surface and nitrogen concentration in signal grass root system. Rates of sulfur by themselves or combined with nitrogen rates do not affect attributes of root system. Key Words: Brachiaria decumbens, dry mass, length, nitrogen concentration, surface Adubações com nitrogênio e enxofre durante dois anos em pastagem de capim-braquiária em degradação: alterações no sistema radicular RESUMO -Objetivou-se avaliar os efeitos das combinações de doses de nitrogênio e de enxofre em pastagem de capimbraquiária (Brachiaria decumbens) em degradação nos atributos produtivos, morfológicos e nutricionais do sistema radicular em quatro profundidades do solo. A pastagem utilizada no experimento foi estabelecida há mais de oito anos em solo Neossolo Quartzarênico. Cinco doses de nitrogênio (0; 150; 300; 450 e 600 kg/ha/ano) e cinco doses de enxofre (0; 15; 30; 45 e 60 kg/ha/ano) foram combinadas em fatorial fracionado, em delineamento de blocos ao acaso, com três repetições. O nitrogênio foi fornecido por meio de aplicação de nitrato de amônio e o enxofre por gesso, em doses parceladas em três vezes no período chuvoso. As avaliações ocorreram em intervalos de 35 dias no período chuvoso e de 56 dias no período seco, em dois anos consecutivos. As raízes foram coletadas por meio de trado de 4 cm de diâmetro nas profundidades de 0-10; 10-20; 20-30 e 30-40 cm do solo. Foram determinados a massa seca de raízes, o comprimento e a superfície radicular e as concentrações de nitrogênio e enxofre nas raízes. As doses de nitrogênio aplicadas em dois anos consecutivos na pastagem promoveram alterações nas raízes, em termos de massa seca, comprimento, superfície e concentração de nitrogênio no capim-braquiária. As doses de enxofre, isoladamente ou combinadas com as de nitrogênio, não promovem alterações nos atributos do sistema radicular.Palavras-chave: Brachiaria decumbens, comprimento, concentração de nitrogênio, massa seca, superfíc...

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Section: Resultsmentioning

confidence: 99%

Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

et al. 2011

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“…When the wood ash is applied to the soil it improves the nitrogen uptake, which may be linked to the magnesium and potassium supplied by this residue (Megda & Monteiro, 2010). Magnesium plays a crucial part in the photosynthetic process, as it is a principal ingredient in the chlorophyll molecule (Hermans & Verbrudgen, 2005;White & Broadley, 2009).…”

Section: Resultsmentioning

confidence: 99%

Wood Ash as a Corrective and Fertilizer in Safflower Crop in Oxisol of Brazilian Cerrado

Bonfim-Silva¹,

Santos²,

Dourado³

et al. 2018

JAS

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This study aimed at estimating the wood ash as a corrective and fertilizer in the safflower crop. This study was done with respect to the development, growth, and production of safflower in response to the wood ash doses applied to Oxisol of the Brazilian Cerrado biome. Adopting the completely randomized design and using five wood ash doses (0, 8, 16, 24, 32 g dm -3 ) and six replicates, the experiments were performed under greenhouse conditions. Each experimental unit included a 2 dm 3 pot, filled with soil that had been incubated earlier for 30 days. The variables studied included soil pH, plant height (cm), stem diameter (mm), number of leaves (plant ) and root dry mass (g pot -1 ) Analysis of variance and subsequent regression test were performed for all the data using SISVAR software, at 5% probability for both. The variables internal and external diameter of the chapters and root volume showed no significant differences. The soil pH revealed a significant effect of the wood ash application tending towards linearity, as did the other vegetative variables of plant height, stem diameter, number of leaves and SPAD index. The productive constituents exhibited improved development when the wood ash was applied to the soil in doses of around 24 g dm -3 or more.

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“…may be due to differences in environmental variables, such as temperature, water availability and sunlight intensity, as well as in management, such as fertilization level and time and age or the plant development stage at harvest. The nutrient that plants most extract from the soil is N; it affects the number of tiller and leaves and the leaf area (Megda & Monteiro, 2010). These authors also emphasized the influence of interactions between nutrients -such as between N and K -on these variables.…”

Section: Resultsmentioning

confidence: 99%

“…The nutrient that plants most absorb from the soil is N; it affects the number of tillers, leaves, and the leaf area, and is, therefore, an important plant yield factor (Megda & Monteiro, 2010). Low N levels keep the emergence rate of new tillers below their potential rate in tropical forage grasses.…”

Section: Introductionmentioning

confidence: 99%

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Structural and productive characteristics of Marandu and Xaraés grasses fertilized at different times after harvesting

et al. 2012

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-The objective of this study was to assess the effect of applying N and K 2 O at different times after harvest on the structure and production characteristics of Marandu and Xaraés cultivars of Brachiaria brizantha. Two greenhouse 4 × 2 factorial experiments using a randomized block design with eight treatments and four replicates were carried out. In experiment 1, the plants in pots were fertilized weekly with 50 mg/dm 3 of N and K 2 O until a week before a uniformity cut, for a total of four applications. After cutting, plants were fertilized with 50 mg/dm 3 of N and K 2 O at 0, 3, 6, and 9 days. Cultivars were evaluated after 44 days of regrowth. In experiment 2, a single 50 mg/dm 3 dose of N and K 2 O was applied a week before the uniformity cut, and 100 mg/dm 3 of N and K 2 O were applied at 0, 4, 8, and 12 days after cutting; cultivars were evaluated after 39 days of regrowth. In experiment 1, the leaf/stem ratio and dry matter yield were influenced by the time at which fertilizers were applied. In the second experiment, the total number of leaves, expanded leaves, dead leaves, and the leaf lamina accumulated length and dry matter production were influenced by the time at which fertilizers were applied. Marandugrass had more leaves and tillers than cv. Xaraés, which, in turn, had greater height, dry matter yield and regrowth vigor. Applying nitrogen and potassium fertilizer immediately after cutting improves the structural characteristics, while the dry matter yield is maximized by applying fertilizers immediately after cutting by using lower doses of N, or at 4.5 days after cutting by using higher doses of N.

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Nitrogen and potassium supply and the morphogenic and productive characteristics of marandu palisadegrass

Cited by 10 publications

References 16 publications

Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

Wood Ash as a Corrective and Fertilizer in Safflower Crop in Oxisol of Brazilian Cerrado

Structural and productive characteristics of Marandu and Xaraés grasses fertilized at different times after harvesting

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