Distribuição de massa molecular de ácidos húmicos e promoção do crescimento radicular

Aguiar, Natália de Oliveira; Canellas, Luciano Pasqualoto; Dobbss, Leonardo Barros; Zandonadi, Daniel Basílio; Olivares, Fábio Lopes; Façanha, Arnoldo Rocha

doi:10.1590/s0100-06832009000600010

Cited by 18 publications

(15 citation statements)

References 43 publications

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“…The benefit of humic acid to shoot growth may be explained by its beneficial effect on plant respiration, i.e., increasing ATP production by stimulating oxidative phosphorylation, with a consequent increase in the absorption and transport of nutrients and also in the biosynthesis of compounds, which results in further shoot development (SILVA et al, 1999). According to Aguiar et al (2009), the stimulation of root growth by HS may be related to their diversity and structural functionality and their similarity with biostimulant substances.…”

Section: Resultsmentioning

confidence: 99%

Humic Acid on Germination and Vigor of Corn Seeds1

et al. 2017

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-The development of technologies to increase stand establishment efficiency and seed vigor, as well as to maximize profits, is of fundamental importance for the sustainability of agriculture. Products based on humic substances, such as humic acids, have been recently used in Brazilian agriculture to produce seedlings with high vigor, which positively influences the establishment of the initial stand. Thus, this study aimed to evaluate the effect of treatment of corn seeds with a commercial humic acid-based product, Humykos® (18% of humic acid content), on germination and seedling vigor. The treatments consisted of six doses (0, 100, 200, 300, 400, and 500 mL 100 kg -1 seed) of Humykos®, and the treated seeds were analyzed for germination and vigor (first count, emergence, emergence speed index, length, and dry mass of shoots and roots). Our results show that humic acid promotes greater seedling growth and increased shoot dry mass in corn; in addition, it has a positive influence on the emergence speed index up to a dose 158 mL 100 kg -1 seeds.

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Section: Resultsmentioning

confidence: 99%

Humic Acid on Germination and Vigor of Corn Seeds1

et al. 2017

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“…A difference was found (p>0.05) in CL levels at the 0-5 cm and 5-10 cm depths between the MA system and the other systems (T5, T8, PA, TCP and TC). The difference found in the 10-20 cm layer between MA and TC regarding CL, according to Aguiar et al (2009), was probably due to the lack of grass species to help structure the soil. Bavoso et al (2010) concluded that different land use systems did to add significant values of MOS accumulation between the sampled systems, and results confirm and demonstrate that CL levels in the MOS are largely susceptible to the quality of soil management systems, enabling to check the short-and medium-term effect depending on the management being used (FABRIZZI et al, 2008, cited by CHAVEZ et al, 2009.…”

Section: Agroforest System With Teak and Cocoa Tcmentioning

confidence: 94%

“…MOS levels are very susceptible to forest management practices, particularly in regions of tropical and subtropical climate, in which the exposed organic matter is decomposed by bioactive organisms (AGUIAR et al, 2009). Likewise, when MOS is protected in the interior of smaller soil aggregates or by strong bonding to the mineral fraction, its levels may remain close to original levels for several crop years (CONTE et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Oxidizable fraction of organic carbon in an Argisol under different land use systems

Müller

Weber

Scaramuzza

2012

CERNE

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ABSTRACT:The objective of this study was to evaluate carbon input in labile and stable fractions in an ARGISOL of northwestern Brazil under different land use systems. Use systems being evaluated include: forest -MA (reference), agrosilvopasture -TCP (teak, cocoa and pasture); agroforest -TC (teak and cocoa); teak forest at 8 and 5 years -T8 and T5, and pasture -PA. In each system three furrows were made at depths of 0-5 cm, 5-10 cm and 10-20 cm. An area consisting of native vegetation (forest) adjacent to the experiment was sampled and used as control treatment. The use systems MA, T8 and T5 had higher levels of total organic carbon (COT) and the MA system had higher levels of labile carbon (CL) than the other systems, with the exception of TC at a depth of 10-20 cm. In the MA system, COT levels were higher in comparison to use systems TCP, TC and PA while CL levels were higher than the levels observed in use systems TCP and TC. In most cases being analyzed, CL levels were lower than COT levels, therefore this trait can be used as an indicator to assess anthropogenic changes relating to the maintenance or condition of soil organic matter.Key words: Soil compartments, Amazonia, lability. FRAÇÃO OXIDÁVEL DO CARBONO ORGÂNICO DE UM ARGISSOLO SOB DIFERENTES SISTEMAS DE USO

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“…The substrate (i) has high values of root dry matter (Table 4), and this can be correlated to the presence of humic acids (HA) and the high content of P (292.2 mg dm -3 ) ( Table 1). Corn seedlings showed an increase in the number of mitosis and lateral roots in treatment HA (Aguiar et al, 2009). According to these authors, the activity of plasm membrane H + -ATPase increases by the action of HA.…”

Section: Rizogenesis: Effect Of Iba X Substrate Interactionmentioning

confidence: 95%

Rooting responses of black pepper (Piper nigrum cv. Bragantina) as affected by chemical, physical and microbiological properties of substrates and auxin

Freire¹,

Schmildt²,

Lopes³

et al. 2017

Aust J Crop Sci

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The quality of the root system in stem cuttings of Piper nigrum is highly associated with the induction of adventitious roots by means of auxins and type of substrates. The objective of this study was to evaluate the rooting of P. nigrum cv. Bragantina cuttings treated or not with indole-3-butyric acid (IBA) in different substrates. The experiment was conducted in a randomized block design following a factorial 2 x 11 scheme (IBA -0 and 4000 mg kg -1 in talc and 11 substrates), with four repetitions of 16 cuttings each. The auxin increased rooting and improved the quality of the root system. The substrates evaluated presented diverse physical, chemical and microbiological characteristics, interfering significantly in the rooting responses. Substrates (d) -soil + limestone + single superphosphate + potassium chloride + chicken manure and (i) -soil + coffee straw + limestone + single superphosphate are the ones recommended for rooting of pepper cv. Bragantina.

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Distribuição de massa molecular de ácidos húmicos e promoção do crescimento radicular

Cited by 18 publications

References 43 publications

Humic Acid on Germination and Vigor of Corn Seeds1

Humic Acid on Germination and Vigor of Corn Seeds1

Oxidizable fraction of organic carbon in an Argisol under different land use systems

Rooting responses of black pepper (Piper nigrum cv. Bragantina) as affected by chemical, physical and microbiological properties of substrates and auxin

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