Caracterização espectral de Paspalum notatum em diferentes níveis de adubação nitrogenada

Fonseca, Eliana Lima da; Rosa, Luís Mauro Gonçalves; Fontana, Denise Cybis

doi:10.1590/s0100-204x2002000300018

Cited by 10 publications

(7 citation statements)

References 9 publications

(15 reference statements)

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“…Similar results were observed by Backes et al (2010), who reported an increasing linear effect on the leaf + stem dry phytomass as a function of the dose of sewage sludge (0, 100, 200, 300, and 400 kg ha -1 N, delivered in a single application) in an area of emerald Zoysia production, and by Fonseca et al (2002), who observed that the control (absence of N) produced the smallest amount of total (stem + leaves) and green (only leaves) dry matter compared to the other treatments (200 and 400 kg ha -1 N, delivered in a single application, using ammonium sulfate as the source) in a study on bahiagrass.…”

Section: Resultssupporting

confidence: 85%

“…The results from this study confirm the N effect on plant shoot growth and the association between N fertilization doses and plant dry matter production (OLIVEIRA et al, 2010;FONSECA et al, 2002). However, a greater amount of dry matter is not a desirable result for lawns with ornamental purposes because it increases the demands for a greater mowing frequency to maintain the aesthetics (AMARAL; CASTILHO, 2012), thereby increasing the maintenance costs.…”

Section: Resultssupporting

confidence: 75%

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Application of herbicides as growth regulators of emerald Zoysia grass fertilized with nitrogen

et al. 2015

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Nitrogen (N) is essential for nutrition and for the maintenance of the intense green color of lawns. However, this element affects shoot growth and, therefore, mowing frequency, which is a key factor of lawn-maintenance costs. Accordingly, this study aimed to evaluate the use of nitrogen fertilization in combination with the use of potential herbicides as growth regulators to promote the maintenance of the high visual (intense green) and nutritional quality of lawns of emerald Zoysia (Zoysia japonica Steud.) grown in Ultisol soil while reducing their leaf growth. The experiment was conducted at the Teaching, Research and Extension Education Farm (Fazenda de Ensino, Pesquisa e Extensão) of São Paulo State University (Universidade Estadual Paulista Júlio de Mesquita Filho, UNESP), Ilha Solteira Campus/ São Paulo (SP), from June/2012 to June/2013. The experimental design consisted of randomized blocks with 20 treatments established in a 5 x 4 factorial arrangement with four replicates, including four herbicides (glyphosate, imazaquin, imazethapyr, and metsulfuron-methyl, applied at doses of 200, 420, 80, and 140 g ha -1 active ingredient (a.i.), respectively) and a control (without herbicide), and four N doses (0, 5, 10, and 20 g m -2 ), split into five applications delivered throughout the year. The following items were evaluated: length, LCI (leaf chlorophyll index), leaf dry matter production and leaf N concentration and the percentage of phytotoxicity on lawn grass shoots. Doses from 10 to 20 g m -2 N provided sufficient N concentrations to maintain the emerald Zoysia. The herbicides metsulfuron-methyl and glyphosate were superior in the control of lawn leaf growth. While the former was phytotoxic, the latter had no effect on the aesthetic quality of the lawn, standing out as an herbicide that may be used at a dose of 200 g ha -1 to regulate the growth of emerald Zoysia. fator do custo de manutenção em gramados. Neste contexto, objetivou-se avaliar a adubação nitrogenada e o uso potencial de herbicidas como reguladores de crescimento em grama esmeralda (Zoysia japonica Steud.), em Argissolo Vermelho, visando manter o gramado com boa qualidade visual (verde intenso) e nutricional bem como reduzir o seu crescimento foliar. O experimento foi conduzido na Fazenda de Ensino, Pesquisa e Extensão da UNESP, Campus de Ilha Solteira/SP, de junho/2012 a junho/2013. Utilizou-se o delineamento em blocos casualizados com 20 tratamentos dispostos num fatorial 5 x 4 com quatro repetições, sendo quatro herbicidas: glyphosate, imazaquin, imazethapyr e metsulfuronmethyl aplicados na dose de, respectivamente, 200, 420, 80 e 140 g ha -1 do ingrediente ativo (i.a.) e a testemunha -sem herbicida; e quatro doses de N: 0, 5, 10 e 20 g m -2 , parceladas em cinco aplicações durante o ano. Avaliaram-se: o comprimento, o índice ICF (índice de clorofila foliar) e a produção de matéria seca das folhas, determinaram-se também a concentração foliar de N e a porcentagem de fitointoxicação da parte aérea do gramado. Doses de 10 a 20 g m ...

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 75%

Application of herbicides as growth regulators of emerald Zoysia grass fertilized with nitrogen

et al. 2015

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“…Planaltina (Figure 3). The study shows that the spectral response alters with the variation of the biomass (FONSECA et al, 2002), because chlorophyll increases when N is applied to the plant. Therefore, the absorption of radiation in the region of the visible spectrum is greater, making NDVI to increase (READ et al, 2003).…”

Section: Resultsmentioning

confidence: 97%

Production of Andropogon gayanus cv. Planaltina dry matter estimated through NDVI

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Pereira²,

Barros³

et al. 2020

R. Agrogeoambiental

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Pasture management studies seldom use remote sensing, especially for Andropogon gayanus cv. Planaltina. This work aimed to investigate whether a single-chip digital camera converted into multispectral equipment could measure and perceive differences in the normalized difference vegetation index (NDVI) in Andropogon gayanus cv. Planaltina grass subjected to different doses of nitrogen. In a greenhouse with a randomized block design, the research team subjected the cultivar to 5 different doses of nitrogen (treatments), with four replications. The group compared the NDVI measurements of canopies carried out with a GreenSeeker® HCS-100 active optical sensor and a Canon PowerShot A495 single-chip camera that was converted into a multispectral device by replacing the glass filter that blocks the passage of the infrared by a filter that allows the passage of the red and near infrared wavelengths. Both measurements were correlated with nitrogen doses, stem and leaf blades dry matter and dead material production, and cultivar height. The study concluded that the multispectral camera, as well as the active optical sensor, measured the NDVI and noticed differences in the production of stem, leaf blades and dead material dry matter, and Andropogon gayanus cv. Planaltina plant height when subjected to different doses of nitrogen.

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“…A avaliação das diferenças dos níveis de nutrientes das plantas pode ser detectada por meio de sensores remotos. Diferenças nos níveis de nitrogênio das plantas, devido à adubação, já foram enfoques em vários trabalhos (JENSEN et al, 1990;FERNÁNDEZ et al, 1994;FONSECA et al, 2002).…”

Section: 37423/210403908unclassified

Ciências agrárias: a multidisciplinaridade dos recursos naturais

2021

Ciências Agrárias: A Multidisciplinaridade Dos Recursos Naturais

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Resumo: O termo "línguas negras" designa, em linguagem popular, as águas residuais sem tratamento e qualquer tipo de esgoto que deságue em rios, mares, valas, canais, lagos e lagunas. Este trabalho teve como objeto de estudo a identificação e mapeamento das "línguas negras" existentes nas praias urbanas de Maceió utilizando técnicas de geoprocessamento. Na convergência dos fatores mencionados, o trabalho demanda diagnosticar, por meio de mapeamento e geoprocessamento, a situação ambiental das "línguas negras" existentes nas praias urbanas de Maceió. Diante da formação desse fato, passou-se a investigar os indicadores formadores e de contribuição, a saber: as galerias pluviais e as bacias hidrográficas formadoras dessas "línguas negras". A pesquisa foi realizada através de levantamentos feitos em bancos de dados de empresas e órgãos públicos, trabalho de campo, análises estatísticas e interpretações de documentos cartográficos digitais, tendo como produto, diferentes mapeamentos das variáveis espaciais definidoras do problema estudado. Com o auxílio de um GPS, as línguas negras foram georreferenciadas e plotadas na base cartográfica de Maceió, definindo assim, a área de estudo. O estudo demonstrou que a maioria das línguas negras encontrase exatamente no final das galerias pluviais, evidenciando assim, a possibilidade da existência de ligações clandestinas nesta rede de galerias.

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Caracterização espectral de Paspalum notatum em diferentes níveis de adubação nitrogenada

Cited by 10 publications

References 9 publications

Application of herbicides as growth regulators of emerald Zoysia grass fertilized with nitrogen

Application of herbicides as growth regulators of emerald Zoysia grass fertilized with nitrogen

Production of Andropogon gayanus cv. Planaltina dry matter estimated through NDVI

Ciências agrárias: a multidisciplinaridade dos recursos naturais

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