Irrigação como estratégia de adaptação de pequenos agricultores às mudanças climáticas: aspectos econômicos

Cunha, Dênis Antônio da; Coelho, Alexandre Bragança; Féres, José Gustavo; Braga, Marcelo José; Souza, Elvanio Costa de

doi:10.1590/s0103-20032013000200009

Cited by 19 publications

(16 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nas regiões onde a irrigação tem caráter suplementar, a decisão de quando irrigar deve estar condicionada às previsões do tempo para reduzir as perdas de água por percolação e nutrientes por lixiviação. Segundo Cunha et al (2013), os produtores rurais podem acessar previsões do tempo para vários períodos e realizar o manejo da irrigação do dia atual, e também calcular a probabilidade de irrigação para dias futuros.…”

Section: Figuraunclassified

Produção Sazonal De Duas Espécies Forrageiras Irrigadas

Bueno

Prado

Tinos

et al. 2019

R_I

View full text Add to dashboard Cite

Produção sazonal de duas espécies FORRAGEIRAS irrigadAS Jhésmila Ingridy Bueno1; Giuliani do Prado1; Adriano Catossi Tinos1; Rafael Rech Bruscagin1 e Gessyka Roberti Volpato1 1Departamento de Engenharia Agrícola - DEA, Universidade Estadual de Maringá - UEM, Rodovia PR 482, km 45, CEP: 87.820-000, Cidade Gaúcha-PR, Brasil. E-mail: jhesmilabueno@hotmail.com, gprado@uem.br, actinos@uem.br, rafaelrechbruscagin@hotmail.com, gessyka_volpato@hotmail.com. 1 RESUMO Esse trabalho objetivou avaliar o efeito da irrigação sobre a produção de dois capins, em diferentes épocas do ano. O experimento foi conduzido entre maio de 2014 e junho de 2015, na Universidade Estadual de Maringá, em Cidade Gaúcha-PR. O delineamento experimental foi em faixas com parcelas subdividas, quatro repetições e três fatores: i) espécies forrageiras (Megathyrsus maximus cv. Mombaça e Urochloa brizantha cv. BRS Piatã); ii) irrigação (irrigado e não irrigado); iii) épocas de corte (oito cortes). As lâminas de irrigação foram determinadas para reposição da evapotranspiração de referência (ET0), estimada pela equação de Penman-Monteith. Os resultados obtidos mostraram que: i) a produtividade das duas forrageiras não apresentou diferenças significativas; ii) a época de corte teve efeito significativo sobre a produção das forrageiras sob irrigação e o cultivo irrigado foi superior ao de sequeiro do primeiro ao quarto corte; iii) as maiores produtividades de matéria seca ocorreram nos meses de maiores temperaturas e radiação solar (novembro a janeiro). Para diferentes épocas do ano, a produção de massa seca pode ser estimada a partir de equações de regressão em função da temperatura e da radiação solar, para o cultivo irrigado (R2 = 73,5%) e de sequeiro (R2 = 91,9%). Palavras-chave: irrigação de pastagem, forrageiras tropicais, temperatura, radiação solar. Bueno, J. I.; Prado, G.; Tinos, A. C.; Bruscagin, R. R.; Volpato, G. R. Seasonal production of two irrigated FORAGE species 2 ABSTRACT This paper aimed to evaluate the irrigation effect under pasture production of Mombaça and Piatã grasses in different year seasons. The experiment was carried out from May 2014 to June 2015, at Universidade Estadual de Maringá, at Cidade Gaúcha-PR. The experiment was set up in strip-plot design, four replications and three factors: i) forage species (Megathyrsus maximus cv. ‘Mombaça’ and Urochloa brizantha cv. ‘BRS Piatã’); ii) irrigation (irrigated and non-irrigated); iii) cutting cycles (eight cuts). Irrigation water depths were calculated forreplacement of reference evapotranspiration (ET0), estimated with Penman-Monteith equation. The results showed that: i) there were no significant differences across the forage species yield; ii) the forage dry matter yield under irrigation was dependent on the harvest season, and the irrigated forages had yields higher than those of non-irrigated forages from the first to fourth cutting cycle; iii) the highest dry matter yields occurred in months with higher values of temperature and solar radiation (November to January). The forage yields depended on the year season, and the forage dry matter yields can be estimated from regression equations as a function of temperature and solar radiation, for irrigated (R2 = 73.5%) and non-irrigated (R2 = 91.9%) pasture. Keywords: pasture irrigation, tropical forage crops, temperature, solar radiation.

show abstract

Section: Figuraunclassified

Produção Sazonal De Duas Espécies Forrageiras Irrigadas

Bueno

Prado

Tinos

et al. 2019

R_I

View full text Add to dashboard Cite

show abstract

“…In the world in general, as well as in Brazil, irrigation is not a totally viable technique, since it is necessary to seek sustainable alternatives that minimize water use in agricultural crops. This type of crop is always exposed and dependent on water-related factors 3 .…”

Section: Introductionmentioning

confidence: 99%

The foliar application of a mixture of semisynthetic chitosan derivatives induces tolerance to water deficit in maize, improving the antioxidant system and increasing photosynthesis and grain yield

Rabelo

Magalhães²,

Bressanin

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Research has shown that chitosan induces plant stress tolerance and protection, but few studies have explored chemical modifications of chitosan and their effects on plants under water stress. Chitosan and its derivatives were applied (isolated or in mixture) to maize hybrids sensitive to water deficit under greenhouse conditions through foliar spraying at the pre-flowering stage. After the application, water deficit was induced for 15 days. Analyses of leaves and biochemical gas exchange in the ear leaf were performed on the first and fifteenth days of the stress period. Production attributes were also analysed at the end of the experiment. In general, the application of the two chitosan derivatives or their mixture potentiated the activities of the antioxidant enzymes superoxide dismutase, catalase, ascorbate peroxidase, glutathione reductase and guaiacol peroxidase at the beginning of the stress period, in addition to reducing lipid peroxidation (malonaldehyde content) and increasing gas exchange and proline contents at the end of the stress period. The derivatives also increased the content of phenolic compounds and the activity of enzymes involved in their production (phenylalanine ammonia lyase and tyrosine ammonia lyase). Dehydroascorbate reductase and compounds such as total soluble sugars, total amino acids, starch, grain yield and harvest index increased for both the derivatives and chitosan. However, the mixture of derivatives was the treatment that led to the higher increase in grain yield and harvest index compared to the other treatments. The application of semisynthetic molecules derived from chitosan yielded greater leaf gas exchange and a higher incidence of the biochemical conditions that relieve plant stress.

show abstract

“…Compared to other countries, Brazil has the most diverse and modern agriculture and therefore is more likely to take adaptive actions. From these results and analysis of studies about the impact of climate change on developing countries (Mendelsohn and Seo, 2007;Seo and Mendelsohn, 2008a;Kurukulasuriya et al, 2011;Seo, 2011;Cunha et al, 2013), it was found that irrigation can be an effective tool to counteract the harmful effects of climate change.…”

Section: Resultsmentioning

confidence: 96%

Irrigation as an adaptive strategy to climate change: an economic perspective on Brazilian agriculture

2014

Self Cite

View full text Add to dashboard Cite

This paper analyzes the potential effects of climate change on Brazilian agriculture by considering irrigation as an adaptive strategy. Investigations were performed to determine how climatic variability influences irrigation and whether this adaptive measure actually reduces producers' vulnerability to climate change. We used a simultaneous equations model with endogenous switching to account for the heterogeneity in the decision of whether to use adaptive measures. We compared the expected land values under the actual and counterfactual cases of farm households that either adapt or do not adapt to climate change. Simulation results show that irrigation can be an effective tool for counteracting the harmful effects of climate change. The income of farmers tends to increase on lands where irrigation technologies are practiced. These conclusions confirm the need to invest in adaptation strategies to prepare Brazil for coping with the adverse effects of global climate change.

show abstract

Irrigação como estratégia de adaptação de pequenos agricultores às mudanças climáticas: aspectos econômicos

Cited by 19 publications

References 22 publications

Produção Sazonal De Duas Espécies Forrageiras Irrigadas

Produção Sazonal De Duas Espécies Forrageiras Irrigadas

The foliar application of a mixture of semisynthetic chitosan derivatives induces tolerance to water deficit in maize, improving the antioxidant system and increasing photosynthesis and grain yield

Irrigation as an adaptive strategy to climate change: an economic perspective on Brazilian agriculture

Contact Info

Product

Resources

About