Crescimento e nutrição de clone de eucalipto em resposta à aplicação de concentrações de c-ácido húmico

Ferreira

Rev. bras. eng. agríc. ambient.

et al. 2016

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.

Section: Resultscontrasting

confidence: 99%

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

Ferreira

Rev. bras. eng. agríc. ambient.

et al. 2016

“…Rosa et al (2009) found a linear positive dose-response effect of HS on the dry mass of bean shoots, the maximum dose showing an increase of 41% compared to the control. In contrast, Pinheiro, Silva and Furtini Neto (2010) observed a negative relationship between applied humic acid concentration and the dry mass of shoots in eucalyptus seedlings.…”

Section: Resultsmentioning

confidence: 65%

Humic Acid on Germination and Vigor of Corn Seeds1

et al. 2017

-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.

“…HS also alter the soil color and improve soil structure, water retention capacity, ion exchange, and buffering power. In addition, they increase the cation exchange capacity and anion exchange capacity, making cations and anions more available to plants (Pinheiro et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial activity of essential oil and growth of Ocimum basilicum (L.) inoculated with mycorrhiza and humic substances applied to soil

Morelli¹,

Ferarrese²,

Munhoz³

et al. 2017

Genet. Mol. Res.

ABSTRACT. Mycorrhizal association increases the absorption of water and nutrients by plants, and thus, affects their metabolism. This study aimed at assessing the single and conjoint effects of the arbuscular mycorrhizal fungus (AMF) Claroideoglomus etunicatum and soil's humic substances (HS) on the composition of essential oil (EO), its antimicrobial activity, and development of basil (Ocimum basilicum L.). The experimental design was completely randomized in a 2 x 2-factorial design (with and without AMF and HS) with 10 replications as follows: T1 -without AMF inoculation and without HS addition; T2 -with AMF inoculation and with HS (2 L/ha); T3 -without AMF inoculation and with HS; T4 -with AMF inoculation and with HS. Plants were grown in pots with 5 kg sterile soil in a greenhouse for 6 months. Then, they were harvested and evaluated for spore density, AMF root colonization, shoot dry matter (SDM), yield and chemical composition of EO as well as minimum inhibitory concentration, used to compare the antimicrobial effect of EO in nine bacteria. The addition of HS to the soil increased the spore density of AMF and SDM (P < 0.001). The AMF inoculation with and without HS increased the EO yield of basil (P < 0.001). The treatments altered the composition of the basil EO, in which a total of fourteen compounds were detected. In treatments with AMF and/or HS, linalool (28.64 to 42.94%) and estragole (27.53 to 47.17%) were the major compounds. However, in the control (without AMF and HS), eugenol (33.90%) was the major compound. The EO showed low microbial activity against bacteria Bacillus cereus, Salmonella enterica serovar typhi, Shigella flexneri, Klebsiella pneumoniae, and Xanthomonas axonopodis pathovar begoniae. AMF inoculation and HS addition could improve the development of basil, increase EO yield, alter the EO chemical composition and its major compounds, but presented low or none microbial activity against most of the bacteria tested in this study.