Photosynthetic capacity of 'Niagara Rosada' grapes grown under transparent plastic covering

ABSTRACT: New techniques in tropical regions such as use of transparent plastic covering (TPC), have been employed in grapes to avoid the wetting leaves and fruits, which can reduce the occurrence of fungal diseases, reduce the use of sprays, and reduce damage caused by hail and high winds. TPC may significantly affect the photosynthetic rates of grapevines cultivated in tropical regions, and thus have strong effects on plant productivity and improve fruit quality. However, in the North of Rio de Janeiro region there are lacks of studies related to TPC effects on photosynthetic capacity. The objective of this study was to evaluate the photosynthetic capacity in 'Niagara Rosada' vines grown under TPC and without transparent plastic covering (WTPC). The experiment was conducted between April and June 2013, on Tabuinha farm, located in the 3rd district of São Fidélis, Rio de Janeiro State, Brazil. A completely randomized block design was used with two treatments (TPC and WTPC) and twelve replications. Evaluations consisted of climatological variables, gas exchange and maximum quantum efficiency of open photosystem II centers-quantum yield (Fv/Fm) It was possible to observe that under TPC maximum temperature increase of 2.3°C, relative humidity reduced 1.5%, vapor pressure deficit increase 0.4kPa, and light intensity reduced 47.7%. These changes did not cause photochemical damage to the leaves. The TPC promoted higher net photosynthetic rate at 800h, which was associated with higher stomatal conductance. Thus, the TPC used in the northern region of Rio de Janeiro State did not impair the photosynthetic capacity of 'Niagara Rosada' vines.

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ARRANJO POPULACIONAL PARA A VARIEDADE UENF-14 DE MILHO PIPOCA

Revista Brasileira de Milho e Sorgo ◽

10.18512/1980-6477/rbms.v16n3p401-413 ◽

2017 ◽

Vol 16 (3) ◽

pp. 401

Author(s):

CÁSSIO VITORAZZI ◽

ANTONIO TEIXEIRA AMARAL JÚNIOR ◽

LILIAM SILVIA CANDIDO ◽

ISMAEL LOURENÇO DE JESUS FREITAS ◽

THIAGO RODRIGUES DA CONCEIÇÃO SILVA

Keyword(s):

Zea Mays ◽

Grain Yield ◽

Rio De Janeiro ◽

Zea Mays L ◽

Block Design ◽

Grain Production ◽

Maize Population ◽

The North ◽

Randomized Complete Block Design ◽

Janeiro State

RESUMO - A adequação do arranjo populacional está entre as técnicas que podem maximizar a produtividade da cultura do milho. Daí a importância das pesquisas que buscam estudar o desempenho de cultivares de milho e milhos especiais, a fim de determinar o arranjo de plantas ideal. O objetivo deste trabalho foi avaliar o desempenho da variedade UENF-14, de milho pipoca, cultivada em diferentes arranjos populacionais, na safra e safrinha, para otimizar a recomendação fitotécnica para os produtores rurais do Norte Fluminense. Foram instalados dois experimentos em Campos dos Goytacazes-RJ. Um na safrinha 2011 utilizando a variedade UENF-14 e o híbrido experimental P2 x P9, e o outro na safra 2011-2012, com a variedade UENF-14 e o híbrido comercial IAC-112. O delineamento experimental, nos dois experimentos, foi o de blocos casualizados arranjados em parcelas subsubdivididas, em que as parcelas foram compostas pelos genótipos, as subparcelas constituídas pelos espaçamentos entre linhas de semeadura (0,45, 0,60 e 0,90 m) e as subsubparcelas compostas pelas densidades de plantas (60.000, 75.000 e 90.000 plantas ha-1). A UENF-14 apresentou desempenho superior aos híbridos, demonstrando seu potencial para cultivo na região Norte Fluminense. Houve aumento do rendimento de grãos com a diminuição do espaçamento entre linhas de plantio. Para a variedade UENF-14, a redução do espaçamento entre linhas de plantio foi vantajosa para a produção de grãos, independentemente da época de semeadura.Palavras-chave: Zea mays L., densidade de semeadura, espaçamento entre linhas, épocas de semeadura. POPULATION ARRANGEMENT FOR THE VARIETY OF POPCORN UENF-14 ABSTRACT - The adequacy of the maize population arrangement is among the most important techniques for obtaining higher yields. Therefore, many researchers have been conducting an attempt to study the performance of corn and specialty corn. The objective was to evaluate the performance of the popcorn variety UENF-14 in different population arrangements, in the harvest season and off-season. Two experiments were carried out in Campos dos Goytacazes, North of Rio de Janeiro State, Brazil, in the off-season 2011, using the UENF-14 variety and the experimental hybrid P2 x P9, and in the season 2011-2012 using UENF-14 and the commercial hybrid IAC-112. The treatments were arranged in randomized complete block design with split plots, in which plots were composed by popcorn genotypes, the subplots consisting of three spacings between sowing lines (0.45, 0.60 and 0.90 m) and the subsubplots composed of three plants per hectare densities (60,000, 75,000 and 90,000 plants.ha-1). The variety UENF-14 presented higher performance than the hybrids, demonstrating its potential for recommendation to the North of Rio de Janeiro State. There was an increase of grain yield by reducing the spacing between the plants rows. The cultivation of the variety UENF-14 reducing the spacing between rows was advantageous for grain production, regardless of planting date.Keywords: Zea mays L., densities of plants, spacing between rows, sowing times.

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Modern processes of palynomorph deposition at lakes of the northern region of the Rio de Janeiro State, Brazil

Anais da Academia Brasileira de Ciências ◽

10.1590/s0001-37652010000300016 ◽

2010 ◽

Vol 82 (3) ◽

pp. 679-690 ◽

Cited By ~ 3

Author(s):

Cynthia F.P. da Luz ◽

Ortrud M. Barth ◽

Cleverson G. Silva

Keyword(s):

Rio De Janeiro ◽

Mechanical Damage ◽

Pollen Grains ◽

Northern Region ◽

Palynological Analysis ◽

The North ◽

Pollen Types ◽

Lake Bottom ◽

Superficial Sediments ◽

Janeiro State

Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the northeastern wind. At Lagoa do Campelo, a total of 58 pollen types were identified, among which the majority of the pollen grains came from hydrophytes, with the highest concentrations found along the northeastern shore. The southeastern shore showed high percentages of pollen and spores with degraded exine and mechanical damage, due to the transport through the lakeby the currents caused by the wind, confirmed by the depositional trend of damaged palinomorphs along the same direction as the prevailing winds.

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Economic viability of ‘Niágara Rosada’ grape production in the north and northwest regions of Rio de Janeiro

Revista Brasileira de Fruticultura ◽

10.1590/0100-29452021672 ◽

2021 ◽

Vol 43 (1) ◽

Author(s):

Jaomara Nascimento da Silva ◽

Niraldo José Ponciano ◽

Claudio Luiz Melo Souza ◽

Paulo Marcelo de Souza ◽

Leandro Hespanhol Viana ◽

...

Keyword(s):

Rio De Janeiro ◽

Net Present Value ◽

Good Alternative ◽

Production Costs ◽

Vitis Vinifera L ◽

The North ◽

The Monte Carlo Method ◽

The Cost ◽

Janeiro State ◽

Niagara Rosada

Abstract The ‘Niágara Rosada’ grape (Vitis labrusca) is the main table cultivar produced in the North and Northwest Regions of the Rio de Janeiro State. This cultivar presents greater rusticity and lower production cost than the cultivars of fine grape (Vitis vinifera L.) because it is more resistant to diseases and the absence of some cultural treatments. The research aimed to determine the economic affordability of the production of ‘Niágara Rosada’ grapes in the north and northwest regions of Rio de Janeiro state, by calculating the Net Present Value (NPV) and the Internal Rate of Return (IRR), and to identify the risk of viticulture, through the sensitivity analysis and the use of the Monte Carlo method. To collect the data, questionnaires, and interviews were applied directly to the wine producers on the technical coefficients and respective production costs of the grape in 1 ha. The results highlighted that viticulture could be a good alternative for the regions, with satisfactory profitability. The variables with the most significant effect on profitability were the sale price of the product, the cost of labor, and the price of packaging. The probability of winegrowers to obtain a negative NPV is 33.32%, considering an attractiveness rate of 6% per year.

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Geo-enviromental diagnoses of the são francisco de itabapoana city in the north of Rio de Janeiro state

Brazilian Journal of Development ◽

10.34117/bjdv6n5-217 ◽

2020 ◽

Vol 6 (5) ◽

pp. 26764-26775

Author(s):

Graziele Arantes Reis ◽

Iago Matheus Lopes Macêdo ◽

Rodson de Abreu Marques

Keyword(s):

Rio De Janeiro ◽

The North ◽

Janeiro State

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Herpetofauna of an Atlantic rainforest area (Morro São João) in Rio de Janeiro State, Brazil

Anais da Academia Brasileira de Ciências ◽

10.1590/s0001-37652008000200007 ◽

2008 ◽

Vol 80 (2) ◽

pp. 291-300 ◽

Cited By ~ 20

Author(s):

Mauricio Almeida-Gomes ◽

Davor Vrcibradic ◽

Carla C. Siqueira ◽

Mara C. Kiefer ◽

Thaís Klaion ◽

...

Keyword(s):

Species Composition ◽

Rio De Janeiro ◽

Sampling Methods ◽

Abundant Species ◽

Study Data ◽

Tropical Regions ◽

Plot Sampling ◽

Reptile Species ◽

The World ◽

Janeiro State

We studied the herpetofaunal community from the Atlantic forest of Morro São João, in Rio de Janeiro State, Brazil, and present data on species composition, richness, relative abundance and densities. We combined three sampling methods: plot sampling, visual encounter surveys and pit-fall traps. We recorded sixteen species of amphibians and nine of reptiles. The estimated densities (based on results of plot sampling) were 4.5 ind/100 m2 for amphibians and 0.8 ind/100 m² for lizards, and the overall density (amphibians and lizards) was 5.3 ind/100 m². For amphibians, Eleutherodactylus and Scinax were the most speciose genera with three species each, and Eleutherodactylus binotatus was the most abundant species (mean density of 3.0 frogs/100 m²). The reptile community of Morro São João was dominated by species of the families Gekkonidae and Gymnophtalmidae (Lacertilia) and Colubridae (Serpentes). The gymnophtalmid lizard Leposoma scincoides was the most abundant reptile species (mean density of 0.3 ind/100 m²). We compare densities obtained in our study data with those of other studied rainforest sites in various tropical regions of the world.

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