Crescimento de raizes e da parte aérea de clones de híbridos de Eucalyptus grandis x Eucalyptus urophylla e de Eucalyptus camaldulensis x Eucalyptus spp submetidos a dois regimes de irrigação no campo

Reis, Geraldo Gonçalves dos; Reis, Múcio Silva; Fontan, Ivan da Costa Ilhéu; Monte, Marco Antônio; Gomes, Antônio Nascimento; Oliveira, Carlos Henrique Rodrigues de

doi:10.1590/s0100-67622006000600007

Cited by 54 publications

(49 citation statements)

References 8 publications

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“…In contrast, the lowest values (0.1118), lower by approximately 70%, was obtained under optimal water supply conditions (100% ETpc) in the lowest salinity level (1.72 dS m -1 ). These results support the inferences of Reis et al (2006), who reported that the root shoot -1 ratio may increase with increasing water stress, given that it is expected that plants have more developed root system when grown under severe water deficits. Thus, according to the estimated mathematical model, the water favoring represented by the increment in ETpc tends to reduce the of the root dry biomass shoot -1 ratio value (Table 4; Figure 1e).…”

Section: Resultssupporting

confidence: 91%

Establishment of Young “Dwarf Green” Coconut Plants in Soil Affected by Salts and Under Water Deficit

et al. 2016

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-The aim was to analyze the establishment of young "Green Dwarf" coconut plants in soils affected by salts and under water stress, by evaluating leaf area, biomass production and allocation. In the experiment, conducted in protected environment in Fortaleza, CE, in statistical design of randomized blocks in a split plot arrangement, the effects of different water deficit levels (plots) were evaluated, by imposing different percentages of replacement of water losses by potential crop evapotranspiration -ETpc (20, 40, 60, 80 and 100%), associated with subplots consisting of increasing soil salinity levels (1. 72, 6.25, 25.80 and 40.70 dS m -1 ) provided by soil collected at different parts of the Morada Nova Irrigated Perimeter -PIMN. Leaf area and biomass production were sharply reduced by the conditions of water stress and high soil salinity, apparently being more critical to the crop under water restriction condition. The degree of water stress can increase the susceptibility to salinity and plants can be considered, in general terms, as moderately tolerant to the effects of salinity, when combined with water deficiency. Coconut seedlings show full capacity of establishment in PIMN saline soils, corresponding to the level of electrical conductivity of 6.50 dS m -1 , but only when the water supply remains adequate. For higher salinity levels, plants survive, but their size is reduced by around 50%, even when fully irrigated. Index terms: Cocos nucifera L., initial growth, multiple stresses, salinity, drought. ESTABELECIMENTO DE PLANTAS JOVENS DE COQUEIRO-"ANÃO-VERDE" EM SOLOS AFETADOS POR SAIS E SOB DEFICIÊNCIA HÍDRICARESUMO -Objetivou-se analisar a capacidade de estabelecimento de plantas jovens de coqueiro, cultivar "Anão-Verde", em solos afetados por sais e sob deficiência hídrica, mediante a avaliação da área foliar, da produção e da alocação de biomassa. No experimento, conduzido em ambiente protegido, em Fortaleza-CE, avaliaram-se, sob delineamento estatístico de blocos casualizados, no arranjo de parcelas subdivididas, os efeitos de diferentes níveis de deficiência hídrica (parcelas), mediante a imposição de distintos percentuais de reposições das perdas de água por evapotranspiração potencial da cultura -ETpc (20; 40; 60; 80 e 100%), associados às subparcelas, constituídas pelos crescentes níveis de salinidade do solo (1,72; 6,25; 25,80 e 40,70 dS m -1 ), proporcionados pelos solos coletados nos diferentes pontos do Perímetro Irrigado Morada Nova -PIMN. A área foliar e a produção de biomassa das plantas são acentuadamente reduzidas pelas condições de restrição hídrica e de elevada salinidade do solo, sendo aparentemente mais crítica à cultura a condição de restrição hídrica. O grau de estresse hídrico é capaz de acentuar a suscetibilidade à salinidade, e as plantas qualificam-se, em termos gerais, como moderadamente tolerantes aos efeitos decorrentes da salinidade, quando combinados com a deficiência hídrica. As plantas jovens de coqueiro mostram plena capacidade de estabelecimento nos solos...

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Section: Resultssupporting

confidence: 91%

Establishment of Young “Dwarf Green” Coconut Plants in Soil Affected by Salts and Under Water Deficit

et al. 2016

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“…Clonal propagation has allowed the adoption of hybridization in breeding programs for commercial exploitation of the heterosis in Eucalyptus genus. The technique is commonly applied to identify eucalypts hybrids with increased stress tolerance [18,19].…”

Section: Introductionmentioning

confidence: 99%

Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Silva

Campoe

Paula³

et al. 2016

Forests

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Abstract:We assessed growth and physiological responses of Eucalyptus and Corymbia species to water limitation aiming to widen possibilities for plantations in dry climatic conditions. We selected 16 taxa: 4 Corymbia and 12 Eucalyptus species from the Subgenera Symphyomyrtus. Seedlings were evaluated from 100 to 170 days after sowing. Growth and physiological traits showed significant differences among taxa and between two levels of water availability. Water limitation significantly impacted biomass production and physiological characteristics, however in different levels. Leaf area and biomass production decreased 15%-48% under water limitation among taxa. Eucalyptus moluccana, CCV 2, and VM1 (drought tolerant clone) showed the largest decrease in leaf area. Transpiration across taxa decreased 30%-57% and photosynthesis 14%-48% under water limited condition. Taxa from cold environments were less responsive in leaf area reduction under water limitation, and taxa from Exsertaria section showed lower reduction in photosynthesis (E. camaldulensis showed the lowest reduction). Responses to water limitation are related to the environment of origin. E. molucana, the only Adnataria species from a high precipitation region (>1500 mm year´1), was one of the most sensitive in reduction of biomass production, different behavior from the other Adnataria species, originated in regions with rainfall <750 mm year´1. Water limitation increased leaf-level water use efficiency by 18% on average, 8% in E. longirostrata, and 28% in E. camaldulensis, E. brassiana, and E. crebra. Growth and physiological responses observed show the potential of different eucalypts taxa to tolerate water limited environments.

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“…These results indicate that the evaluated parameters are strongly linked to a genetic character. REIS et al (2006), the Grancam hybrid tended to higher height, diameter and volume in the non-irrigated system, different behavior in relation to Urograndis hybrid, whose growth has tended to be higher in the irrigated treatment. However, these same authors explained their higher growth under water stress, the fact that the Grancam hybrid has depth root (0.97 m) and the highest proportion of biomass allocated to the root system (25.94%).…”

Section: Resultsmentioning

confidence: 80%

“…Where: θ fc -soil moisture at field capacity (matric potential of -10 kPa, m 3 m -3 ); θ pwp -soil moisture in the permanent wilting point (matric potential of -1500 kPa m 3 m -3 ); Z -depth of the root system, 970 mm (REIS et al, 2006); "p" -factor of soil water depletion for conifers (0.7) as recommended by ALLEN et al (1998). (4) The EAW Loc was 38.9 and 58.8 mm for dripping and micro sprinklers.…”

Section: (Eucalyptus Grandis X Eucalyptus Camaldulensis)mentioning

confidence: 99%

Initial development of two eucalyptus hybrid submitted to irrigation

et al. 2013

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ABSTRACT:The eucalyptus offers several advantages compared to other forestry species and, by using the irrigation can increase productivity and decrease production time. The objective of the present study was to evaluate two hybrid eucalyptus (Grancam and Urograndis), no irrigation, dripping and micro sprinkler irrigated at 90, 120, 150 and 180 days after transplanting (DAT). The experiment was conducted at the experimental irrigation area in the State University of Mato Grosso do Sul, in the municipality of Aquidauna -State of MS, Brazil. The experimental design was randomized blocks, split plot with four blocks and two replications within each block, and the plots were composed by irrigation treatments (dripping, micro sprinkler irrigate and dry) and the subplots the hybrids (Grancam and Urograndis).The total area of the experiment had 3 hectares, where each plot consisted of 1 ha. It was evaluated plant height, stem diameter and canopy, stem basal area, the relationship between height and stem diameter, the relationship between height and canopy diameter and stem volume. Data were subjected to analysis of variance and compared by Tukey test at 5% probability. Irrigation systems and dripping sprinkle provide greater plant height, stem diameter, canopy diameter, stem basal area and stem volume.KEYWORDS: Eucalyptus spp., sprayer, dripping irrigation, evapotranspiration. DESENVOLVIMENTO INICIAL DE DOIS HÍBRIDOS DE EUCALIPTO SUBMETIDOS À IRRIGAÇÃORESUMO: O eucalipto oferece diversas vantagens em comparação a outras espécies florestais, e utilizando a irrigação localizada pode aumentar a produtividade e diminuir o tempo de produção. Objetivou-se pelo presente estudo avaliar dois híbridos de eucalipto (Grancam e Urograndis), sem irrigação e irrigados por gotejamento e microaspersão aos 90; 120; 150 e 180 dias após transplante (DAT). O experimento foi instalado na área experimental de irrigação da Universidade Estadual de Mato Grosso do Sul, no município de Aquidauana-MS. O delineamento experimental foi o de blocos casualizados, em parcelas subdivididas, com quatro blocos e duas replicações dentro de cada bloco, sendo que as parcelas foram compostas pelos tratamentos de irrigação (gotejamento, microaspersão e sequeiro), e as subparcelas, pelos híbridos (Grancam e Urograndis). Foram avaliadas a altura de plantas, o diâmetro do caule e da copa, a área basal do caule, a relação entre altura e diâmetro do caule, a relação entre altura e diâmetro da copa e o volume do caule. Os dados foram submetidos à análise de variância e comparadas pelo teste de Tukey, no nível de 5% de probabilidade. Os sistemas de irrigação por gotejamento e microaspersão propiciam maior altura de plantas, diâmetro do caule, diâmetro da copa, área basal do caule e volume de caule.

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Crescimento de raizes e da parte aérea de clones de híbridos de Eucalyptus grandis x Eucalyptus urophylla e de Eucalyptus camaldulensis x Eucalyptus spp submetidos a dois regimes de irrigação no campo

Cited by 54 publications

References 8 publications

Establishment of Young “Dwarf Green” Coconut Plants in Soil Affected by Salts and Under Water Deficit

Establishment of Young “Dwarf Green” Coconut Plants in Soil Affected by Salts and Under Water Deficit

Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Initial development of two eucalyptus hybrid submitted to irrigation

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