Eficiência do hidrogel e respostas fisiológicas de mudas de cultivares apirênicas de citros sob défice hídrico

Ferreira, Ester Alice; Silva, Vânia Aparecida; Silva, Elisângela Aparecida; Silveira, Helbert de Rezende Oliveira

doi:10.1590/s1983-40632014000200009

Cited by 14 publications

(13 citation statements)

References 20 publications

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“…In Brazil, positive effects of hydrogels have been reported for several crops, including: coriander, in Pernambuco (ALBUQUERQUE FILHO et al, 2009), citrus in Minas Gerais (FERREIRA et al, 2014), lettuce in Rio de Janeiro (SANTOS et al 2006), and eucalyptus in Rio Grande do Sul, Brazil (NAVROSKI et al, 2015). However, the use of these water-retaining polymers is indicated preferentially for those regions with low water availability and/or prolongued periods of drought mean low soil moisture adversely affects plant growth and development (AZEVEDO et al, 2002).…”

Section: Composição E Finalidadesmentioning

confidence: 99%

“…Efeitos positivos do hidrogel foram observados em diversas culturas, como: o coentro, em Pernambuco (ALBUQUERQUE FILHO et al, 2009), citros, em Minas Gerais (FERREIRA et al, 2014), alface, no Rio de Janeiro (SANTOS et al, 2015), e eucalipto, no Rio Grande do Sul (NAVROSKI et al, 2015). No entanto, a utilização desses polímeros hidrorretentores é preferencialmente indicada para regiões com baixa disponibilidade de água ou longos períodos de estiagem, ocasião em que a baixa umidade do solo afeta negativamente o crescimento e o desenvolvimento das plantas (AZEVEDO et al, 2002).…”

Section: Composição E Finalidadesunclassified

“…However, satisfactory results have also come from studies carried out in other areas of agriculture. Ferreira et al (2014), tested the effects applying 2 L of the hydrated hydrogel Hydroplan®-EB on the physiology of cirtus seedligs pot-grown under water stress. It was observed that the polymer promoted recuperation and maintenance of hydric status in 4 of the 6 analysed cultivars.…”

Section: Fruitculturementioning

confidence: 99%

“…Em experimento realizado por Ferreira et al (2014), avaliando a eficiência de 2 L do hidrogel Hydroplan ® -EB hidratado, aplicados em vasos nas respostas fisiológicas de mudas de cultivares de citros sob défice hídrico, observaram que o polímero promoveu a recuperação e a manutenção do status hídrico de mudas de 4 das 6 cultivares analisadas. No entanto, os autores ressaltaram que esses resultados dependem dos mecanismos fisiológicos de resposta ao défice hídrico, visto que essas cultivares também apresentaram redução considerável nas trocas gasosas, possivelmente pela saturação do solo com o uso desse volume de hidrogel.…”

Section: Fruticulturaunclassified

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Hydrogels in Brazilian Agriculture

Neto

Araújo

Chagas

et al. 2017

AGRO@MBIENTE ON-LINE

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Abstract:The rational use of water is essentual as it is a finite resource. Consequerntly, studies of methids that minimize water use water are essential. As a result, agricultural hydrogels have been extensively tested in as a means of promoting agriculture improvements because of their water-and nutriente-retention characteristics. However, even though hydrogels are used in several sectors of Brazilian agriculture, there are still very few studies on their applications, the best methods and the quantities to be used. Consequently, there is a need for research into the applicability of this technology in Brazil, so that future research needs can be identified and appropriate decisions made at the production level. Therefore, the aim of this study was to collate currently available information on the applicability of agricultural hydrogels in Brazilian agriculture. Over the last decade, forestry is the sector in Brazil that has most studied and used hydrogels, but others such as fruit-and coffeegrowing have also been involved. The method of applying the polymer in granules directly mixed-in with growth substrates is the most used in the production of seedlings. However, use of hydrated gel at planting sites has also been explored. While synthetic hydrogels are most commonly used, those made of natural materials have great potential due to the low preparation costs and their in-soil biodegradability. The quantities of hydrogel used vary according to the target species, application method and objective.Key words: Water sustainable use. Hydro absorvent polymer. Application. Agricultural cultures.Resumo: A utilização racional da água faz-se necessária uma vez que esse recurso é finito, assim, estudos sobre a produção e minimização do uso da água são essenciais. A partir disso, os hidrogéis agrícolas vêm sendo amplamente testados na agricultura por promoverem benfeitorias às plantas pelas suas características de retenção de água e nutrientes. No entanto, mesmo sendo utilizados em diversos ramos da agricultura brasileira, estudos quanto aos métodos de aplicação e às quantidades utilizadas ainda são escassos, justificando a necessidade de pesquisas que elucidem a aplicabilidade dessa tecnologia, para assim gerar informações que sustentem decisões precisas no nível produtivo e experimental. Portanto, objetivou-se com este trabalho compilar as principais informações atuais quanto à aplicabilidade dos hidrogéis agrícolas na agricultura brasileira. A silvicultura é o setor que mais vem estudando e utilizando o uso dos polímeros hidrorretentores nos últimos 10 anos no Brasil, porém, setores como a fruticultura e a cafeicultura também vêm se destacando. O método de aplicação do polímero em grânulos em mistura direta com substratos é o mais utilizado na produção de mudas, todavia, a utilização do gel hidratado no local de plantio apresenta-se como uma alternativa promissora à agricultura brasileira. Os hidrogéis sintéticos são os mais utilizados, no entanto, os constituídos por materiais naturais têm grande potencial em funçã...

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Section: Composição E Finalidadesmentioning

confidence: 99%

Section: Composição E Finalidadesunclassified

Section: Fruitculturementioning

confidence: 99%

Section: Fruticulturaunclassified

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Hydrogels in Brazilian Agriculture

Neto

Araújo

Chagas

et al. 2017

AGRO@MBIENTE ON-LINE

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“…According to Ferreira et al (2014), hydrogel is an available technology of water replenishment to plants; on the other hand, Aouada et al (2008) claimed that the presence of nutrients in the solution may compromise the entry of water into the polymeric networks, because the degree of swelling is favored by the strong attractive interactions between the chemical structures of the polymer and the water.…”

Section: Introductionmentioning

confidence: 99%

Humic substances, purified MAP and hydrogel in the development and survival of Eucalyptus urograndis

Silva

Ferreira

Silva

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe development and survival of Eucalyptus urograndis plants may be influenced by products based on humic fractions of the organic matter, purified MAP and soil conditioners, such as hydrogel. Thus, the present study aimed to evaluate the effect of the commercial products Fertiactyl ® , based on humic substances, purified MAP and hydrogel on the post-planting development and survival of Eucalyptus urograndis. The experiment was conducted in a randomized block design, with 25 treatments and four replicates, each of which consisted of 6 plants. The immersion of the tubes in solution with doses of Fertiactyl ® and purified MAP promoted the increase in the development and survival of the plants. In the preparation of the hydrogel, the use of solution based on Fertiactyl ® and purified MAP reduced the hydration capacity of the water-retaining polymer. With increasing doses, there was a linear increment in the electrical conductivity of the solution, exponentially reducing the hydration capacity of the polymer.Substâncias húmicas, MAP purificado e hidrogel no desenvolvimento e sobrevivência de Eucalyptus urograndis R E S U M OO desenvolvimento e a sobrevivência de plantas de Eucalyptus urograndis podem ser influenciados por produtos à base de frações húmicas da matéria orgânica, MAP purificado e condicionadores de solo, como hidrogel; assim, realizou-se o presente trabalho com o objetivo de avaliar o efeito dos produtos comerciais Fertiactyl ® à base de substâncias húmicas, MAP purificado e hidrogel no desenvolvimento e na sobrevivência em pós-plantio de Eucalyptus urograndis. O experimento foi conduzido em delineamento de blocos casualizados com 25 tratamentos e quatro repetições sendo cada repetição uma parcela composta por 6 plantas. A imersão dos tubetes em solução com doses de Fertiactyl ® e MAP purificado promoveu o aumento no desenvolvimento e na sobrevivência das plantas. No preparo do hidrogel a utilização de solução à base de Fertiactyl ® e MAP purificado reduziram a capacidade de hidratação do polímero hidro-retentor; com o aumento das doses houve aumento linear na condutividade elétrica da solução fazendo com que a capacidade de hidratação do polímero fosse reduzida exponencialmente.

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Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

Guilherme

Aouada

Fajardo

et al. 2015

European Polymer Journal

578

325

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a b s t r a c t Superabsorbent hydrogels (SH) continue being a very important issue in both academic and industrial fields due to their applications in several technologies. This is proved by the impressive number of publications, through papers and patents as well, dealing with SH. This review is targeted to update and discuss some important aspects of synthesis, characterization and application of SH in agriculture, mainly those based on polysaccharides, as soil conditioners and as polymer carriers for nutrient release. Basic properties of SH and some methods for chemically modifying polysaccharides are given and some directions for hydrogels preparation are highlighted as well. Mechanisms associated with water transport into the 3D matrix, taking into account the transference of mass from hydrogelsoil system to plant, are discussed in the light of some mathematical models. Release of nutrients either from granules coated by hydrophilic polymer or from SH, targeting applications in agriculture, is also discussed on the basis of often used mathematical models (the swelling-based kinetic models) and on a diffusion-based kinetic model with a partition activity coefficient. Examples of recent applications in agriculture as soil conditioners and carriers for nutrient release (fertilizers, etc.) are given. At the final, future trends and perspectives are considered. More than two hundreds references are cited in the whole text.

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Eficiência do hidrogel e respostas fisiológicas de mudas de cultivares apirênicas de citros sob défice hídrico

Cited by 14 publications

References 20 publications

Hydrogels in Brazilian Agriculture

Hydrogels in Brazilian Agriculture

Humic substances, purified MAP and hydrogel in the development and survival of Eucalyptus urograndis

Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review

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