Selection of Eucalyptus Clones and Adjustment of Potassium Doses for Extended Drought in Bahia Savanna

Sampaio, Thalita Fernanda; Dalcin, Tiago Elias; Bogiani, Júlio César; Mori, Édson Seizo; Guerrini, Iraê Amaral

doi:10.1590/0100-67622016000600008

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…This nutrient is required for the osmotic balance of cells and its availability in the soil is associated with stem diameter growth in eucalyptus clones [39,40]. Therefore, the limitation of uptake by the eucalyptus clonal hybrid reduces cell expansion, cell wall formation, and stem diameter of this plant [41].…”

Section: Growth Parametersmentioning

confidence: 99%

Growth, Nutrient Accumulation, and Nutritional Efficiency of a Clonal Eucalyptus Hybrid in Competition with Grasses

Maciel

Duque

Ferreira

et al. 2022

Forests

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Invasive grasses reduce resource availability, mainly nutrients in the soil, and the growth of eucalyptus plants. Efficient management to increase productivity depends on understanding levels of weed interference in eucalyptus plantations. The nutritional efficiency of eucalyptus plants in competition has been evaluated by plant tissue analysis. The objective was to evaluate the growth, relative accumulation of nutrients, and nutritional efficiency of the eucalyptus clonal hybrid I144 (Eucalyptus urophylla × Eucalyptus grandis), in competition with Megathyrsus maximus cv. BRS zuri, Urochloa brizantha cv. marandu, Urochloa decumbens cv. basilisk and in the control (eucalyptus plants without weed competition). The experiment was carried out with a completely randomized design, with four treatments and ten replications. The height, stem diameter, number of leaves, leaf area, dry matter of leaves and stem, nutrient content in leaves and uptake, transport, and N, P, and K utilization efficiency of the eucalyptus clonal hybrid were evaluated at 110 days after transplantation. The growth parameters and relative contents of macro and micronutrients in the eucalyptus clonal hybrid were lower in competition with M. maximus, U. brizantha and U. decumbens. The efficiency of N, P, and K uptake and transport by the eucalyptus clonal hybrid was 29.41 and 7.32% lower in competition with U. decumbens than in the control treatments, respectively. The efficiency of N, P, and K utilization by eucalypts was 13.73, 9.18, and 22.54% lower in competition with M. maximus, U. brizantha, and U. decumbens, respectively. The reduced growth and nutritional parameters of the eucalyptus clonal hybrid were more evident in competition with U. decumbens. Plant tissue analyses efficiently determined the level of competition for nutrients between species. Crop competition with grasses can decrease the efficiency and use of nutrients, which consequently reduces plant development and productivity.

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Section: Growth Parametersmentioning

confidence: 99%

Growth, Nutrient Accumulation, and Nutritional Efficiency of a Clonal Eucalyptus Hybrid in Competition with Grasses

Maciel

Duque

Ferreira

et al. 2022

Forests

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“…Eucalyptus spp. planting is done in the months prior to and during the rainy season in Brazil when irrigation is, generally, not necessary (Stape et al 2001, Sampaio et al 2016, making conditions favorable for G. assimilis, which prefers moist soil and a dark environment (Grodzki 1972, David et al 2003, Barbosa et al 2009. Nymphs and adults of this pest feed on the stem, leaves, roots, and branches of young Eucalyptus spp.…”

Section: Introductionmentioning

confidence: 99%

Bioecological aspects of the common black field cricket, Gryllus assimilis (Orthoptera: Gryllidae) in the laboratory and in Eucalyptus (Myrtaceae) plantations

Masson¹,

Tavares²,

Alves³

et al. 2020

JOR

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The common black field cricket, Gryllus assimilis (Orthoptera: Gryllidae), damages young plants of red cedar, Juniperus virginiana (Cupressaceae); strawberry, Fragaria × ananassa (Rosaceae); sugarcane, Saccharum officinarum (Poaceae); teak, Tectona grandis (Lamiaceae); upland cotton, Gossypium hirsutum (Malvaceae); and, mainly, Eucalyptus spp. (Myrtaceae). The objective of this study was to investigate the biological and behavioral parameters of this insect in the laboratory and in Eucalyptus spp. plantations in Inhambupe, Bahia State, Brazil. The incubation period and the viability of G. assimilis eggs were 11.87 days and approximately 22%, respectively. The duration of the nymphal stage was 62.34 days with approximately 60% of the nymphs obtained in the laboratory being females. The average number of egg batches per female, eggs per female, and eggs per batch per female of this insect were 25.50, 862.17, and 34.65, respectively. G. assimilis females lived for 76.50 days in the adult stage, and 138.34 days in total, from egg through nymph to adult. Males produced three characteristic sounds: one for the marking of territory, one for courtship, and one when alone. G. assimilis fed primarily on weeds but, in their absence, it damaged young Eucalyptus spp. plants. This paper presents important data on the biology and behavior of G. assimilis; this information may encourage additional biological research, laboratory rearing, and integrated management of this pest.

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“…a 937,7 kg/ha aos 64 meses de idade (abril de 2017) e 591,2 a 834,9 kg/ha aos 69 meses de idade (setembro de 2017). Para Silva (2004), Cunha et al (2005), Larcher (2006), Mochiutti et al (2006), Ferreira et al (2007), Barlow et al (2007) Esses resultados também vão de acordo com o encontrado por Sampaio et al (2016), onde foram testadas diferentes doses de potássio (0, 30, 60 e 120 kg ha -1 de K2O) no crescimento de clones de eucalipto, ao 6, 9, 12 e 24 meses de idade, no município de Luís Eduardo Magalhães na Bahia, dentre eles os AEC 144, AEC 224 e AEC 1528, e os autores concluíram que a adubação potássica influencia positivamente o crescimento, em altura e diâmetro, e a produtividade dos clones, sobretudo nos períodos onde a disponibilidade hídrica é limitada. Tatagiba et al (2009) Para se estimar com maior precisão a transpiração e por consequência a EUA, dos clones avaliados no presente estudo, foram realizados dois processos de calibração do método de sondas de Granier (1985).…”

Section: Eua = ∆Biomassa Estimada De Madeira Transpunclassified

Dinâmica do crescimento e eficiência do uso da água de clones de >i<Eucalyptus>/i< spp. submetidos a omissão de potássio

Soares¹

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Growth dynamics and water use efficiency of Eucalyptus spp submitted to potassium omission Studies that evaluate the performance of genetic materials resistant and/or tolerant to water stress, the dynamics and water use efficiciency (WUE) and how fertilization management acts in this process are important to achieve the sustainability of forest production. The objective of this study was to evaluate the effect of potassium omission on the development and water use efficiency of different eucalyptus genotypes. The experiment was implemented in December 2011 at the Itatinga Experimental Forest Science Station, which belongs to the Department of Forest Sciences of ESALQ/USP. In a randomized block design with six replications, each consisting of twelve treatments in a 6x2 factorial arrangement, being six eucalyptus clones and two doses of potassium fertilization. The growth evaluations of the experiment were performed in all treatments and repetitions for the variables: total height, diameter at breast height, crown percentage and volume. For the determination of the individual volume of the trees and the quantification of the wood biomass, 3 destructive samples were made along the whole rotation. In addition, the leaf area index was evaluated with the aid of LAI-2200 equipment; monthly litter deposition and soil moisture with Diviner 2000 equipment. In determining the sap flow, the Granier probe method was used, also allowing the adjustment of regression models to estimate the sapwood área. The sap flow analysis was performed on the genetic materials COP 1404 and AEC 144, in the presence and absence of potassium, from april 2017 to december 2018. With the transpirated water volume data and the wood biomass increment in the evaluated period, WUE was calculated. Throughout all evaluations, COP 1404 and COP 1407 clones were the least productive, presenting at 72 months of age 72.7% and 86.5%, respectively, of the productivity achieved by AEC 144, the most productive clone, the which was the only one not to present responses to potassium fertilization. It was observed the need to calibrate the Granier method to estimate the sap flow at the clone level and that only one calibration process is not enough to describe the sap flow throughout the entire rotation. The highest transpiration values were found for COP 1404, being higher in the treatment without potassium fertilization; AEC 144, with lower transpiration rates, showed superior transpiration when fertilized with potassium. In general, the AEC 144 clone showed higher values for the WUE and considering the entire period evaluated, the AEC 144 K-showed a value of 2.4 g / L and the AEC 144 K + of 1.60 g / L, while the COP 1404 K + showed a value of 1.20 g / L and COP 1404 K-a value of 1.02 g / L. Nocturnal transpiration negatively influenced plant growth, which may be a response to different environmental factors. The presence of potassium in the soil for clone AEC 144, may have stimulated an increase in stomatal opening over the evaluated period, causing water loss th...

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Selection of Eucalyptus Clones and Adjustment of Potassium Doses for Extended Drought in Bahia Savanna

Cited by 5 publications

References 7 publications

Growth, Nutrient Accumulation, and Nutritional Efficiency of a Clonal Eucalyptus Hybrid in Competition with Grasses

Growth, Nutrient Accumulation, and Nutritional Efficiency of a Clonal Eucalyptus Hybrid in Competition with Grasses

Bioecological aspects of the common black field cricket, Gryllus assimilis (Orthoptera: Gryllidae) in the laboratory and in Eucalyptus (Myrtaceae) plantations

Dinâmica do crescimento e eficiência do uso da água de clones de >i<Eucalyptus>/i< spp. submetidos a omissão de potássio

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