LIVIVO - Search results -

Search results

Result 1 - 10 of total 41

Search options

Article ; Online: Agrometeorological models for predicting seedlings development of two native forest species

Fabrina Bolzan Martins / Mábele de Cássia Ferreira / Gabriel Wilson Lorena Florêncio

Scientia Agricola, Vol 79, Iss

2021 Volume 4

Abstract: ABSTRACT Models of development are tools that connect the effects of development on the environment, allowing their applications in several studies. Nevertheless, studies are scarce on models of development for native forest species in Brazil. This study ...

Abstract	ABSTRACT Models of development are tools that connect the effects of development on the environment, allowing their applications in several studies. Nevertheless, studies are scarce on models of development for native forest species in Brazil. This study aimed to predict the development of two native forest species - Citharexylum myrianthum Cham. and Bixa orellana L. - with two agrometeorological models, being one linear (Phyllochron) and another nonlinear (Wang and Engel, 1998). Both models predict the cumulative leaf number (CLN) on a daily basis, which generates the seedling phase duration (SPD) when integrated to time. Data were used from two years of experiments conducted during 2015 and 2016 growing seasons and 12 sowing dates in Itajubá, Minas Gerais State, Brazil. These species × sowing dates × years experiments provided a rich dataset for calibrating and evaluating both models. Although both models used in the study allowed predicting the dynamics of leaf development, CLN, and SPD in two native forest species, the Wang and Engel model provided a more accurate prediction of CLN and SPD for C. myrianthum species, with an overall root mean square error (RMSE) of 1.82 leaves (CLN) and 5.9 days (SPD). For B. orellana, the Phyllochron model was slightly better, with an overall RMSE of 1.48 leaves (CLN) and seven days (SDP).
Keywords	Bixa orellana L ; Citharexylum myrianthum Cham ; air temperature ; leaf appearance ; phenology ; Agriculture (General) ; S1-972
Subject code	580
Language	English
Publishing date	2021-07-01T00:00:00Z
Publisher	Universidade de São Paulo
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Cardinal temperatures for the leaf development of Corymbia citriodora and Eucalyptus urophylla seedlings

Cleverson Henrique de Freitas / Fabrina Bolzan Martins / Marcel Carvalho Abreu

Pesquisa Agropecuária Brasileira, Vol 52, Iss 5, Pp 283-

2017 Volume 292

Abstract: Abstract: The objective of this work was to estimate cardinal temperatures and phyllochron for the leaf development of the eucalyptus species Corymbia citriodora and Eucalyptus urophylla, in the seedling phase. A field experiment was carried out in a ... ...

Abstract	Abstract: The objective of this work was to estimate cardinal temperatures and phyllochron for the leaf development of the eucalyptus species Corymbia citriodora and Eucalyptus urophylla, in the seedling phase. A field experiment was carried out in a completely randomized design, in a 2x11 factorial arrangement, with the two eucalyptus species, 11 sowing dates, and five replicates, in the municipality of Itajubá, in the state of Minas Gerais, Brazil. The cardinal temperatures - base, optimum, and maximum - for leaf development were, respectively, 8.7, 17.1, and 41.3°C, for C. citriodora, and 11.5, 17.1, and 40.5°C for E. urophylla. The phyllochron of C. citriodora was 62.95°C day per leaf, and that of E. urophylla was 46.03°C day per leaf, which indicates that E. urophylla requires less energy accumulation than C. citriodora for leaf emission in the main stem.
Keywords	air temperature ; leaf emission rate ; phyllochron ; seedling quality ; thermal requirement ; Agriculture (General) ; S1-972
Subject code	580
Language	English
Publishing date	2017-05-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Climate projections of chill hours and implications for olive cultivation in Minas Gerais, Brazil

Fabrina Bolzan Martins / Rodolfo Armando de Almeida Pereira / Roger Rodrigues Torres / Diego Felipe dos Santos

Pesquisa Agropecuária Brasileira, Vol

2020 Volume 55

Abstract: Abstract: The objective of this work was to determine the accumulation of chill hours and to define the areas with aptitude for olive (Olea europaea) cultivation in the state of Minas Gerais, Brazil, as well as to analyze the impacts of climate change ... ...

Abstract	Abstract: The objective of this work was to determine the accumulation of chill hours and to define the areas with aptitude for olive (Olea europaea) cultivation in the state of Minas Gerais, Brazil, as well as to analyze the impacts of climate change projections on chilling-hour requirements and climatic zoning, in two radiative forcing scenarios. The trigonometric method was used to quantify the number of chill hours, considering base temperatures (Tb) of 7.0, 9.5, and 13°C (high, medium, and low chill, respectively), and was applied to present climate (1983-2012) and to two future climate (2041-2070 and 2071-2100) conditions. The present climate data were obtained from 47 conventional weather stations, and the future climate data were obtained from three Earth system models (IPSL-CM5A-LR, MRI-CGCM3, and MIROC5). Future projections point to a decrease in the suitable areas for olive crop cultivation, particularly under representative concentration pathway (RCP) 8.5 and for olive cultivars with a high-chilling requirement (Tb=7.0ºC). Of the olive cultivars requiring medium chill (Tb=9.5ºC), only 2.6% (RCP 4.5) and 1.6% (RCP 8.5) will be suitable in the extreme south and in higher altitude areas of Minas Gerais, while, of those requiring low chill (Tb=13ºC), 11.8% (RCP 4.5) and 6.7% (RCP 8.5) will be suitable. If the climate projections become true, the cultivation of olive crops will be viable in the southern region and in higher altitude areas of the state of Minas Gerais.
Keywords	Olea europaea ; chilling-hour requirements ; Earth system models ; radiative forcing scenarios ; Agriculture (General) ; S1-972
Subject code	550
Language	English
Publishing date	2020-12-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: MODIFICAÇÕES NO MEIO DE CULTURA, FOTOPERÍODO E TEMPO DE CULTIVO AFETAM O ALONGAMENTO E ENRAIZAMENTO IN VITRO DE BANANEIRA CV. PACOVAN

Marcos Vinícius Marques Pinheiro / Ana Cristina Portugal Pinto de Carvalho / Fabrina Bolzan Martins

Nativa, Vol 6, Iss

2018 Volume 1

Abstract: No intuito de elevar as taxas de sobrevivência durante a etapa de aclimatização e posterior plantio a campo, avaliou-se o enraizamento in vitro de bananeira cv. Pacovan, em diferentes concentrações de sais MS e de sacarose. Utilizou-se DIC, esquema ... ...

Abstract	No intuito de elevar as taxas de sobrevivência durante a etapa de aclimatização e posterior plantio a campo, avaliou-se o enraizamento in vitro de bananeira cv. Pacovan, em diferentes concentrações de sais MS e de sacarose. Utilizou-se DIC, esquema fatorial (6x2x3), com seis meios de cultura [sendo três concentrações de nutrientes do meio MS (100%; 50% de macronutrientes; e 50% dos sais macro e micronutrientes), e duas concentrações de sacarose (1,5/3,0%)], dois fotoperíodos (12/16 h) e três tempos de cultivo (21, 28 ou 35 dias) e seis repetições/tratamento. Analisaram-se: altura da planta, número de folhas/planta, massas frescas e secas das partes aérea e radicular. Para altura da planta, massa fresca da parte aérea e radicular, o meio MS 50% dos sais + sacarose (1,5%) com fotoperíodo de 16 h e tempo de cultivo de 35 dias foi satisfatório. Para massa seca da parte aérea foi MS 50% de sais + sacarose (3%), e para massa seca da parte radicular, MS 100% + sacarose (3%) (em 12hs/28 dias e 16hs/21 dias). Para o alongamento/enraizamento in vitro da bananeira cv. Pacovan sugere-se MS 50% de sais (macro e micronutrientes), redução ou manutenção de sacarose (1,5 ou 3%) em 16h/35 dias de cultivo. Palavra-chave: Musa spp., propagação in vitro, sistema radicular. CHANGES IN CULTURE MEDIUM, PHOTOPERIOD AND TIME OF CULTIVATION AFFECT THE IN VITRO ELONGATION AND ROOTING OF BANANA CV. PACOVAN ABSTRACT: In order to achieve high rates of survival during the acclimatization and later planting in the field, was evaluated the in vitro of banana cv. Pacovan plants under different concentrations of sucrose and MS basal salt mixture. The experiment was assembled in a DIC, in 6x2x3, six different culture media [three different MS salt mixture concentrations (100%; 50% of macronutrients; and 50% of macro/micronutrients) and two sucrose concentrations (1.5/3%)], two photoperiods (12/16 hours) and three cultivation times (21, 28 or 35 days). Each treatment was composed by 6 replicates. Plant height, number of leaves/plant, fresh and dry ...
Keywords	Agriculture ; S ; Environmental sciences ; GE1-350
Language	English
Publishing date	2018-02-01T00:00:00Z
Publisher	Universidade Federal de Mato Grosso (UFMT)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Estimativa da temperatura basal inferior para as cultivares de oliveira Grappolo e Maria da Fé

Plínio Marcos Bernardo de Souza / Fabrina Bolzan Martins

Revista Brasileira de Meteorologia, Vol 29, Iss 2, Pp 307-

2014 Volume 313

Abstract: A temperatura basal inferior (Tb) é uma variável de entrada muito utilizada em modelos que quantificam o desenvolvimento de culturas agrícolas e florestais. O objetivo deste trabalho foi estimar a Tb para o desenvolvimento vegetativo na fase de muda, ... ...

Abstract	A temperatura basal inferior (Tb) é uma variável de entrada muito utilizada em modelos que quantificam o desenvolvimento de culturas agrícolas e florestais. O objetivo deste trabalho foi estimar a Tb para o desenvolvimento vegetativo na fase de muda, para duas cultivares de oliveira, Grappolo e Maria da Fé, em condições de campo. O estudo foi desenvolvido na área Experimental da Empresa de Pesquisa Agropecuária de Minas Gerais, em Maria da Fé, MG, Brasil, conduzido sob o delineamento inteiramente casualizado, sendo duas cultivares de oliveira, três épocas de transplantio, e quinze repetições. A Tb foi estimada através de seis métodos, cujos valores obtidos variaram em função do método de cálculo utilizado. A Tb estimada foi de 9,6 ºC para a Grappolo e 6,9 ºC para a Maria da Fé.
Keywords	Desenvolvimento ; Temperatura do ar ; Fenologia ; Olea europaea L ; Meteorology. Climatology ; QC851-999 ; Physics ; QC1-999 ; Science ; Q
Language	Portuguese
Publishing date	2014-06-01T00:00:00Z
Publisher	Sociedade Brasileira de Meteorologia
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Crescimento de Milhos Transgênico (Bt) e Não Transgênico Inoculados com Fungos Micorrízicos Arbusculares em Solo Contaminado por Cádmio

Ana Paula Del Ducca / Eliane Guimarães Pereira Melloni / Rogério Melloni / Fabrina Bolzan Martins

Revista Brasileira de Ciência do Solo, Vol 39, Iss 5, Pp 1275-

2015 Volume 1281

Abstract: RESUMO Com o crescimento populacional, aumenta-se a necessidade da produção de alimentos; paralelamente, observa-se o uso indiscriminado de fertilizantes e incorporação de plantas transgênicas no sistema produtivo. O objetivo deste trabalho foi avaliar o ...

Abstract	RESUMO Com o crescimento populacional, aumenta-se a necessidade da produção de alimentos; paralelamente, observa-se o uso indiscriminado de fertilizantes e incorporação de plantas transgênicas no sistema produtivo. O objetivo deste trabalho foi avaliar o efeito do cádmio no crescimento de milho transgênico Bt e não transgênico, inoculados com fungos micorrízicos arbusculares em condições controladas. Para isso, instalou-se um experimento em esquema fatorial 5 × 4 × 2, sendo cinco doses de Cd (0; 28,5; 71,50; 142,50; e 285 mg kg-1Cd), inoculação individual de espécies de fungos micorrízicos arbusculares - FMAs (Glomus clarum, Acaulospora scrobiculatae Scutellospora heterogama) e um controle não inoculado; duas cultivares de milho Monsanto, DKB-390 (Bt) e DKB-S, e três repetições por tratamento, totalizando 120 unidades experimentais compostas de recipientes plásticos de 500 mL cada. O experimento foi conduzido por 45 dias, avaliando-se, em seguida, atributos relacionados ao crescimento vegetativo e de colonização micorrízica. As doses de Cd não influenciaram o crescimento de milho transgênico Bt e não transgênico, independentemente da inoculação de FMAs. O milho transgênico Bt não respondeu à inoculação, com colonização micorrízica entre 14 e 33 %, quando comparada a do milho não transgênico, entre 32 e 74 %.
Keywords	metais pesados ; micorriza arbuscular ; planta geneticamente modificada ; Agriculture (General) ; S1-972
Language	English
Publishing date	2015-10-01T00:00:00Z
Publisher	Sociedade Brasileira de Ciência do Solo
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Individual tree growth models for eucalyptus in northern Brazil

Fabrina Bolzan Martins / Carlos Pedro Boechat Soares / Gilson Fernandes da Silva

Scientia Agricola, Vol 71, Iss 3, Pp 212-

2014 Volume 225

Abstract: The diameter and height growth model is one of three submodels used for simulating individual tree growth. In Brazil, there are few studies on the dimensional growth of individual trees be they native or exotic species, despite their potential. This ... ...

Abstract	The diameter and height growth model is one of three submodels used for simulating individual tree growth. In Brazil, there are few studies on the dimensional growth of individual trees be they native or exotic species, despite their potential. This study aimed to evaluate diameter and height growth models for individual trees for eucalyptus stands and to validate the best fitting model. Tree diameter and height data were obtained from 48 permanent plots of unthinned stands of Eucalyptus grandis × Eucalyptus urophylla hybrid located in northern Brazil. The evaluation of the diameter and height growth models was based on adjusted coefficient of determination, standard error of estimate as a percentage, trend, root mean square error and Akaike Information Criterion. Analysis also included distribution of residual percentage, statistical significance and signs of the coefficients. The Lundqvist-Korf model provided the most accurate estimates for diameter and height growth, in comparison with the other models, providing better statistical values, greater proximity to observed values and better distribution of residual percentages. The use of this type of model is feasible and can result in significant improvements in the accuracy of yield estimates.
Keywords	growth and yield models ; forest growth prediction ; tree-level models ; Agriculture (General) ; S1-972
Subject code	310
Language	English
Publishing date	2014-06-01T00:00:00Z
Publisher	Universidade de São Paulo
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Cardinal temperatures and thermal requirements for the initial development of two Brazilian native species

Mábele de Cássia Ferreira / Fabrina Bolzan Martins / Gabriel Wilson Lorena Florêncio / João Pedro Guimarães Cândido Silva / Liliana Auxiliadora Avelar Pereira Pasin

Pesquisa Agropecuária Brasileira, Vol

2019 Volume 54

Abstract: Abstract: The objective of this work was to estimate the cardinal temperatures and to quantify the thermal requirements for the initial development of seedlings of the native tree species Citharexylum myrianthum and Bixa orellana. A field experiment was ... ...

Abstract	Abstract: The objective of this work was to estimate the cardinal temperatures and to quantify the thermal requirements for the initial development of seedlings of the native tree species Citharexylum myrianthum and Bixa orellana. A field experiment was carried out in a completely randomized design, in a 2?12 factorial arrangement (2 tree species and 12 sowing dates), with five replicates. The base, optimum, and maximum temperatures for the development of C. myrianthum were 11.4, 18.1, and 36.6°C, and, for B. orellana, 12.0, 18.4, and 46.4°C. The thermal requirements for the development of C. myrianthum was 66.7°C day per leaf, and, for B. orellana, 82.5°C day per leaf. In the initial development, B. orellana shows a large thermal amplitude and is tolerant to extreme temperatures, while C. myrianthum shows a large thermal amplitude, but a lower thermal requirement and a more rapid development than B. orellana.
Keywords	Bixa orellana ; Citharexylum myrianthum ; air temperature ; leaf appearance ; phenology ; Agriculture (General) ; S1-972
Subject code	670
Language	English
Publishing date	2019-09-01T00:00:00Z
Publisher	Embrapa Informação Tecnológica
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Individual tree growth models for eucalyptus in northern Brazil

Fabrina Bolzan Martins / Carlos Pedro Boechat Soares / Gilson Fernandes da Silva

Scientia Agricola, Vol 71, Iss 3, Pp 212-

2014 Volume 225

Abstract	The diameter and height growth model is one of three submodels used for simulating individual tree growth. In Brazil, there are few studies on the dimensional growth of individual trees be they native or exotic species, despite their potential. This study aimed to evaluate diameter and height growth models for individual trees for eucalyptus stands and to validate the best fitting model. Tree diameter and height data were obtained from 48 permanent plots of unthinned stands of Eucalyptus grandis × Eucalyptus urophylla hybrid located in northern Brazil. The evaluation of the diameter and height growth models was based on adjusted coefficient of determination, standard error of estimate as a percentage, trend, root mean square error and Akaike Information Criterion. Analysis also included distribution of residual percentage, statistical significance and signs of the coefficients. The Lundqvist-Korf model provided the most accurate estimates for diameter and height growth, in comparison with the other models, providing better statistical values, greater proximity to observed values and better distribution of residual percentages. The use of this type of model is feasible and can result in significant improvements in the accuracy of yield estimates.
Keywords	growth and yield models ; forest growth prediction ; tree-level models ; Agriculture (General) ; S1-972
Subject code	310
Language	English
Publishing date	2014-06-01T00:00:00Z
Publisher	Universidade de São Paulo
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: EQUAÇÕES PARA ESTIMAR ESTOQUE DE CARBONO POR HECTARE NOS FUSTES DAS ÁRVORES DE FLORESTA ESTACIONAL SEMIDECIDUAL

Carlos Pedro Boechat Soares / Marcio Leles Romarco de Oliveira / Fabrina Bolzan Martins / Lívia Thais Moreira de Figueiredo

Ciência Florestal, Vol 26, Iss 2, Pp 579-

2016 Volume 588

Abstract: The aim of this study was to adjust equations to estimate the carbon stock per hectare in stems of trees in function of forest variables, obtained by horizontal point sampling (Bitterlich method). Were sampled 55 points with a basal area factor K = 1, in ...

Abstract	The aim of this study was to adjust equations to estimate the carbon stock per hectare in stems of trees in function of forest variables, obtained by horizontal point sampling (Bitterlich method). Were sampled 55 points with a basal area factor K = 1, in natural forest fragments, located at Viçosa, Minas Gerais. After adjustment and evaluation of different regression models, was verified that the model 8 (non-linear) were the most precise to estimate the carbon stock per hectare in the stems of trees.
Keywords	Agriculture ; S ; Forestry ; SD1-669.5
Language	Portuguese
Publishing date	2016-01-01T00:00:00Z
Publisher	Universidade Federal de Santa Maria
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

Full text online

Full text

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED

Full text online

More links

Kategorien

Inter-library loan at ZB MED