Stimulatory Effects of Humic Substances on Plant Growth

Chen, Yona; Nobili, Maria De; Aviad, Tsila

doi:10.1201/9780203496374.ch4

Cited by 157 publications

(195 citation statements)

References 81 publications

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“…However, the exact mechanism responsible for this effect of HS is poorly understood. Some authors suggest that HS promote plant growth by improving the soil bioavailability of certain nutrients, mainly iron and zinc [ 3,4 ], others propose that HS can directly influence the plant metabolism both by activating the root plasma membrane-ATPase activity and increasing the nitrate uptake rates in roots [ 7 ]. This could act as a signal for root-to-shoot distribution of certain plant growth regulators (polyamines) and phytohormones (cytokinins and abscisic acid).…”

mentioning

confidence: 99%

“…Humic substances, including humic acids, are natural organic polyelectrolytes contained in the humus, which stabilize the soil organic matter [ 3 ]. Several authors [3][4][5][6] ] have reported the ability of HS to increase the growth of different plant species grown under diverse conditions. However, the exact mechanism responsible for this effect of HS is poorly understood.…”

mentioning

confidence: 99%

“…The combination of Bm with each of the HMs overcame to some extent the negative effects of Cu and Cd on these parameters. It was expected that Bm application would improve substantially the fresh weight and [3][4][5][6] ] who showed that the root application of HS (particularly HA) caused a significant increase in shoot growth. However, it should be noted that the other studies were performed with purified HA [ 6 ].…”

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confidence: 99%

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Protective Effect of Humic Acids Against Heavy Metal Stress in Triticale

Sergiev¹,

Todorova²,

Moskova³

et al. 2013

Proceeding BAS

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The effects of copper and cadmium and the preparation Biomin (natural substance extracted from coal with a.i. humic acids) on the biometric parameters, some stress markers and enzymatic activities in leaves and roots of triticale plants were investigated. The functional carbon distribution in Biomin was analyzed by 13 C NMR. It was found that all treatments retarded the growth and fresh weight of the plants. Heavy metals enhanced the content of stress markers proline and malondialdehyde and the activities of guaiacol peroxidase, superoxide dismutase and glutathione-S-transferase. The opposite trend was observed after Biomin application. Catalase activity was not affected considerably by the treatments. The free thiol-containing compounds were increased only in the roots of cadmium-treated plants. Comparative analysis of the measured parameters suggested that Biomin possessed protective effect against heavy metal toxicity.

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Protective Effect of Humic Acids Against Heavy Metal Stress in Triticale

Sergiev¹,

Todorova²,

Moskova³

et al. 2013

Proceeding BAS

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“…Similar results have been reported with green bean (Tam and Tiquia 1994) and tomato (Dukare et al 2011) used in phytotoxic and growth bioassays. Several authors have attributed the seed germination and root stimulatory effect to a small fraction of lower molecular mass (, 3500 Da) components of humic substances present in compost (Nardi et al 2002;Chen et al 2004). …”

Section: Phytotoxicity Of Compost Teasmentioning

confidence: 99%

Effects and relationships of compost type, aeration and brewing time on compost tea properties, efficacy againstPythium ultimum, phytotoxicity and potential as a nutrient amendment for seedling production

Martin

Dorinvil

Brathwaite

et al. 2012

Biological Agriculture & Horticulture

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Trinidad and TobagoStudies were undertaken to determine the effects and relationships of compost type, aeration, and brewing time on compost tea properties, phytotoxicity, and efficacy in inhibiting growth of Pythium ultimum in vitro. The effect of compost tea on dry matter of tomato and sweet pepper seedlings cultivated on compost-amended substrate was also investigated. Compost type, aeration, and brewing time significantly affected the microbial and chemical properties of compost teas made from banana leaf (BLC) and lawn clipping (LCC) composts. Both aerated and nonaerated compost teas made from BL and LC composts significantly inhibited mycelial growth of P. ultimum. However, growth inhibition (GI) levels were significantly higher in compost teas produced from LCC. Aerating compost tea (ACT) did not consistently result in higher GI levels across compost types. Neither did increasing brewing time beyond 18 h for ACT and 56 h for nonaerated compost tea (NCT). Across all ACTs, yeast population was positively related to GI whereas bacterial population had a positive relationship with GI across all NCTs. Evidence suggests that multiple groups of microorganisms contributed to GI through antibiosis and competition for resources. All compost teas stimulated seed germination of tomato and root growth in sweet pepper. However, NCTs brewed for 56 h using LCC or BLC, and ACT produced from BLC brewed for 18 h, significantly reduced seed germination of sweet pepper. Application of NCT brewed for 168 h made from BLC significantly increased total dry matter of tomato seedlings by 122% compared with the control.

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“…This increase in growth parameters could be because of the uptake of minerals that would promote the root length and further enhance the weight of the crops [12][13][14][15][16][17][18] . Humic acid plays an important role in freeing up the nutrients in the soil and making them available for the plants.…”

Section: Effect Of Humic Acid On Allium Cepa In Pot Studymentioning

confidence: 99%

Formulation of Vermiwash and Humic Acid and its Application on Allium cepa

Prakash¹,

Prasad²,

Sunkar³

et al. 2016

Biosci., Biotech. Res. Asia

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The continuous use of chemical fertilizers is leading to the contamination of soil and adversely affects the flora and fauna. Look out for natural forms of fertilizers is unceasing. The aim of the present investigation was to determine the influence of vermiwash and humic acid and their combinations various concentrations on the growth of Allium cepa. Vermiwash and humic acid and combinations of vermiwash and humic acid are used as plant growth promoters in varying concentrations. In this study, the concentration of 3:1.5 % (vermiwash: humic acid) was found to be the most effective formulation which was manifested in increase in growth, soft shoots, number of branches, total carbohydrate content and total protein content followed by a concentration of 3:2 % (vermiwash: humic acid). This study was effective in formulating an efficient chemical free fertilizer that can be further used in agriculture on a large scale.

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Stimulatory Effects of Humic Substances on Plant Growth

Cited by 157 publications

References 81 publications

Protective Effect of Humic Acids Against Heavy Metal Stress in Triticale

Protective Effect of Humic Acids Against Heavy Metal Stress in Triticale

Effects and relationships of compost type, aeration and brewing time on compost tea properties, efficacy againstPythium ultimum, phytotoxicity and potential as a nutrient amendment for seedling production

Formulation of Vermiwash and Humic Acid and its Application on Allium cepa

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