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| Registros recuperados: 42 | |
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| Cortignani, Raffaele; Dono, Gabriele; Doro, Luca; Ledda, Luigi; Mazzapicchio, Graziano. |
| The climate change in the agricultural sector acting on multiple weather variables at different times of the various crop cycles. In several cases by changing the mean level of variables (rainfall, temperature, etc..), in other cases by changing the distribution of events. This work provides an evaluation of the economic impact due to changes in multiple events, and to the associated uncertainty. For this reason, a classical two-stage stochastic programming model was extend into a three-stages model. The model is specified for an area of Sardinia, and examines the impact of climate change on rainfall and hence on the availability of water for agriculture, and on maximum temperatures and, therefore, on the requirements of some irrigated crops relevant to... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Discrete Stochastic Programming Model; Climate change; Water availability; Irrigation requirements; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Research Methods/ Statistical Methods. |
| Ano: 2010 |
URL: http://purl.umn.edu/109317 |
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| SORIANO, B. M. A.; PADOVANI, C. R.; FERNANDES, F. A.; FERNANDES, A. H. B. M.. |
| O objetivo do presente trabalho foi analisar as alterações do balanço hídrico climatológico (BHC) para a sub-região da Nhecolândia, Pantanal Sul Mato-grossense, sob as condições climáticas atuais e baseados nos cenários climáticos futuros. Para isso, foram utilizados dados mensais de precipitação (P) e temperatura do ar (T) coletados na estação climatológica de Nhumirim referente ao período de 1977 a 2015. A partir desses dados foi realizado o BHC (THORNTHWAITE; MATHER, 1995), considerando três cenários climáticos: C1 - cenário atual de 1977 a 2015, C2 - cenário atual e incremento mensal de +2,5°C nos valores de T e diminuição -10% nos valores mensal de P, C3 - cenário atual e um incremento mensal de +3,5°C nos valores de T e diminuição -20% nos valores... |
| Tipo: Separatas |
Palavras-chave: Water availability; Mudança climática; Disponibilidade de água; Balanço Hídrico; Climate change; Available water capacity. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1076305 |
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| Rocha,Omar Cruz; Ramos,Maria Lucrécia Gerosa; Veiga,Adriano Delly; Guerra,Antonio Fernando; Bartholo,Gabriel Ferreira; Rodrigues,Gustavo Costa; Silva,Juliano Escobar da. |
| Abstract The objective of this work was to evaluate the effect of irrigation and of the presence of brachiaria (Urochloa decumbens) between coffee (Coffea arabica) rows on coffee yield and on chemical and hydrophysical attributes of a Typic Haplustox. The study was conducted in the Cerrado region in Planaltina, Brasília, DF, Brazil, in a randomized complete block design, arranged in split-split plots, with four replicates. Water regimes (irrigated or rainfed) were assigned to the main plots, inter-row management systems to the subplots, and soil layers to the sub-subplots. The following soil attributes were determined: total organic carbon, total nitrogen, C/N ratio, carbon and nitrogen stocks, bulk density, aggregate stability, total porosity,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Urochloa decumbens; Cover crops; Soil physical quality; Soil porosity; Water availability. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901476 |
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| Silva,José Fausto Guimarães; Severiano,Eduardo da Costa; Costa,Kátia Aparecida de Pinho; Benites,Vinícius de Melo; Guimarães Júnnyor,Wellingthon da Silva; Bento,José Carlos. |
| Agricultural production systems that include the production of mulch for no-tillage farming and structural improvement of the soil can be considered key measures for agricultural activity in the Cerrado region without causing environmental degradation. In this respect, our work aimed to evaluate the chemical and physical-hydric properties of a dystrophic Red Latosol (Oxisol) in the municipality of Rio Verde, Goias, Brazil, under different soil management systems in the between-crop season of soybean cultivation five years after first planting. The following conditions were evaluated: Brachiaria brizantha cv. Marandu as a cover crop during the between-crop season; Second crop of maize intercropped with Brachiaria ruziziensis; Second crop of grain alone in a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria; Crop succession; No-tillage; Least limiting water range; Water availability. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000500023 |
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| Meus,Lorenzo D.; Muttoni,Martina; Bartz,Alex C.; Kaminski,Tiago A.; Alberto,Cleber M.. |
| ABSTRACT The objective of this study is to analyze the classification of rice grains of lowland cultivars grown under flood and sprinkler irrigation. The study was carried out in the agricultural years 2011/2012 and 2014/2015 using a completely randomized block design with split plots. In 2011/2012, the treatments were three lowland rice cultivars grown under flood irrigation system and five sprinkler irrigation depths with four replications. In 2014/2015, the experimental design was maintained but flood irrigation was not performed. After harvest, the samples were processed in a rice testing machine, including peeling, polishing and classification. Whole and broken grains were weighed to calculate hulling and milling yield. The classifications followed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Water availability; Grain quality; Productivity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400599 |
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| Oliveira,Vanessa de Souza; Lima,Augusto Miguel Nascimento; Salviano,Alessandra Monteiro; Bassoi,Luís Henrique; Pereira,Giuliano Elias. |
| Soils under natural conditions have heavy metals in variable concentrations and there may be an increase in these elements as a result of the agricultural practices adopted. Transport of heavy metals in soil mainly occurs in forms dissolved in the soil solution or associated with solid particles, water being their main means of transport. In this context, the aim of this study was to evaluate the heavy metal and micronutrient content in the soil and in the grapevine plant and fruit under different irrigation strategies. The experiment was carried out in Petrolina, PE, Brazil. The treatments consisted of three irrigation strategies: full irrigation (FI), regulated deficit irrigation (RDI), and deficit irrigation (DI). During the period of grape maturation,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water availability; Nutrients; Grape. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100162 |
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| OLIVEIRA, V. S.; PEREIRA, G. E.; LIMA, A. M. N.; SALVIANO, A. M.; NASCIMENTO, R. L.; BASSOI, L. H.. |
| Deficit irrigation is used to control grapevine vegetative vigor and the grape composition can be influenced by soil water content. The minerals contained in the grapes are responsible for the physicochemical properties and stability of the wine. Therefore, the aim of this work was to evaluate the effects of irrigation strategies on the properties of ?Syrah? wines produced in São Francisco Valley, Brazil. The irrigation treatments used were FI (full irrigation), RDI (regulated deficit irrigation), and DI (deficit irrigation). Winemaking was performed by traditional methods, followed by stabilization and bottling. Density, alcohol content, pH, total and volatile acidity, total and free sulfur dioxide, total polyphenols index, color intensity, and total... |
| Tipo: Artigo de periódico |
Palavras-chave: Vitis vinifera L; Grape; Water availability; Tropical wine; Vinho tropical; Uva; Vitis Vinifera; Disponibilidade de Água; Grapes. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1146254 |
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| SILVA, E. M. da; AZEVEDO, J. A. de. |
| O período de centrifugação, necessário ao equilíbrio da umidade no solo, é fator determinante da precisão da curva de retenção de umidade. O objetivo deste trabalho foi avaliar o efeito do período de centrifugação na curva de retenção de umidade em cinco tipos de solo da região do Cerrado. As curvas de retenção foram ajustadas por meio de regressão não linear, e a soma dos erros residuais do ajuste foi utilizada para avaliar as diferenças estatísticas entre elas, pelo teste da razão de verossimilhança. As curvas de retenção de umidade foram agrupadas em famílias de curvas, para cada tipo de solo, para facilitar a visualização das diferenças. Os resultados mostraram claramente que o período de centrifugação afeta a curva de retenção, promovendo assim,... |
| Tipo: Separatas |
Palavras-chave: Water availability; Matric potential.; Centrifugação; Cerrado; Disponibilidade de Água; Retenção de Água no Solo; Solo; Umidade do Solo.; Regression analysis.. |
| Ano: 2002 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/566629 |
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| Registros recuperados: 42 | |
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