Fontes e doses de boro em porta-enxertos de seringueira

Moreira, Adônis; Moraes, Vicente Haroldo de Figueiredo; Castro, C. de

doi:10.1590/s0100-204x2006000800012

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…The sources ensured the availability of nutrients at adequate levels during the development of the plant without causing phytotoxicity up to the maximum estimated rate (MER) of 4.6 mg.kg -1 . The lower RV under H 3 BO 3 at the highest B concentrations is related to the high-water solubility of this source, which allows for greater contact with the plant root system and a consequent increase in nutrient uptake (Moreira et al, 2006). The increase in RV up to the MER corroborates the arguments of Marschner (2012), who reported that the lack of B causes inhibition of root elongation due to problems observed during cell division and cell elongation, resulting in thick roots with low volumes and necrotic tips.…”

Section: Resultsmentioning

confidence: 99%

Boron sources and rates on soybean seed physiological quality and root system volume

et al. 2023

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Soybean has shown increasing performance in terms of yield in recent years. However, despite this growth, the lack of quality control and knowledge about the effects of the nutritional status of plants has compromised the germination and vigor of a significant proportion of seeds. The aim of this study was to evaluate the physiological performance of seeds and root growth of soybean cultivated with boron (B) sources with different solubilities incorporated into the soil. The experimental design was completely randomized in a 2×5 factorial arrangement, with two B sources (boric acid and ulexite) and five B rates (0, 2, 4, 8, and 16 mg.kg-1). 100-seed weight (100SW), germination, seedling shoot length (SSL), seedling root length (SRL), accelerated aging (AA), root protrusion (RP), lignin content in the seed coat (LCSC), and root volume (RV) were evaluated. The B sources and rates showed a significant interaction with increases in RV, RP, SSL, SRL, and 100SW, while the LCSC decreased with increasing rates with no interaction effect, indicating a reduction of seed quality with rates up to 8.0 mg.kg-1, regardless of the B source used.

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Section: Resultsmentioning

confidence: 99%

Boron sources and rates on soybean seed physiological quality and root system volume

et al. 2023

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“…Contrary to the studies up to now presented here on the effect of increasing boron doses on crop development, Freitas et al (2006) assessed the effects of boron-induced deficiency on Passiflora edulis (passion fruit) plants and did not find a significant reduction in root dry mass. For rubber tree rootstock, Moreira et al (2006) studied different boron doses and found that high doses (8 mg dm −3 of boron) did not affect the number of roots.…”

Section: Resultsmentioning

confidence: 99%

Production of Star Fruit Rootstocks Fertilized With Different Boron Doses

Xavier

Natale

2017

BJA

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Among the tropical fruits, star fruit stands out due to its flavor and nutritional properties. Nevertheless, the information on fertilization and nutrition of this fruit is still scarce. For this reason, this study aimed to assess the effect of different boron doses on star fruit rootstock growth. The experimental design was randomized block design, consisting of five treatments of boron application (0, 1, 2, 3, and 4 mg dm−3) and four replications. Star fruit rootstock did not respond to boron doses applied to the substrate and hence it did not influence the parameters stem diameter, plant height, the number of leaves, dry mass of shoot, dry mass of roots, total dry mass, and Dickson quality index (DQI). A boron dose up to 4 mg dm−3 (800% of the recommended boron dose of 0.5 mg dm−3) did not produce symptoms of visual toxicity in the plant.

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“…Para avaliação dos teores foliares (Tabela 4), foram utilizados como referência os dados obtidos por Moraes et al (2011) Malavolta et al (1997) e Moreira et al (2006), eles podem ser considerados baixos. Tal resultado possivelmente deva-se a aspectos morfológicos, como o escleromorfismo foliar das folhas dos clones de H. rigidifolia e de H. guianensis com H. pauciflora, com folíolos rígidos e densa ramificação de nervuras secundárias e terciárias (Pires et al, 2002), o que pode ser caracterizado por menor teor de nutrientes e, além disso, com o calibre visivelmente mais grosso que os verificado nos folíolos mais tenros de H. brasiliensis, que também deve ter influenciado negativamente o teor foliar.…”

Section: Resultsunclassified

Clones de copa de seringueira resistentes ao mal-das-folhas para o cultivo na Amazônia tropical úmida

Moraes

Moraes²,

Moreira

et al. 2013

Bragantia

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O objetivo deste trabalho foi avaliar o desempenho de 11 clones de copa de seringueira de Hevea pauciflora × H. guianensis, H. guianensis × H. pauciflora, H. pauciflora × H. rigidifolia e H. pauciflora resistentes ao fungo Microcyclus ulei, causador do mal-das-folhas, sobre o painel de CNS AM 7905 (seleção primária de H. brasiliensis), durante 14 anos nas condições edafoclimáticas da Amazônia tropical úmida. Foram avaliados: produtividade de borracha seca durante sete anos, aspectos anatômicos, características fisiológicas do látex, estado nutricional das plantas e métodos de sangria (oriental e amazônica). Os clones de copa CPAA C 01, 06 e 45 produziram, na média, mais de 1,4 t ha- 1 ano- 1 de borracha seca, seguido pelos clones CPAA C 13, 14, 15, 16 e 20, com produtividade acima de 1,0 t ha-1 ano- 1, enquanto os clones CPAA C 18, CPAA C 33 e CBA 2 registraram produtividade inferior a 0,9 t ha-1 ano- 1. A concentração de Pi e Mg no látex e os teores foliares de K e Cu estão relacionados com a produtividade dos clones CPAA C 01, 06 e 45, sendo esses fatores importantes no programa de seleção de clones de copa de seringueira. Em plantio comercial, o método da sangria oriental é mais eficiente que a amazônica.

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Fontes e doses de boro em porta-enxertos de seringueira

Cited by 6 publications

References 7 publications

Boron sources and rates on soybean seed physiological quality and root system volume

Boron sources and rates on soybean seed physiological quality and root system volume

Production of Star Fruit Rootstocks Fertilized With Different Boron Doses

Clones de copa de seringueira resistentes ao mal-das-folhas para o cultivo na Amazônia tropical úmida

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