Stimulatory Effects of Humic Substances on Plant Growth

2004 ◽  
Author(s):  
Yona Chen ◽  
Maria De Nobili ◽  
Tsila Aviad
Keyword(s):  
Plant Growth ◽  
Humic Substances

scholarly journals Effect of different levels of humic acids on the nutrient content, plant growth, and soil properties under conditions of salinity

2011 ◽  
Vol 6 (No. 1) ◽  
pp. 21-29 ◽  
Author(s):  
H. Khaled ◽  
H.A. Fawy
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Humic Acids ◽  
Foliar Application ◽  
N Uptake ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Nutrient Content ◽  
Nutrient Elements ◽  
A Minor

In this study, the effects were investigated of salinity, foliar and soil applications of humic substances on the growth and mineral nutrients uptake of Corn (Hagein, Fardy10), and the comparison was carried out of the soil and foliar applications of humic acid treatments at different NaCl levels. Soil organic contents are one of the most important parts that they directly affect the soil fertility and textures with their complex and heterogenous structures although they occupy a minor percentage of the soil weight. Humic acids are an important soil component that can improve nutrient availability and impact on other important chemical, biological, and physical properties of soils. The effects of foliar and soil applications of humic substances on the plant growth and some nutrient elements uptake of Corn (Hagein, Fardy10) grown at various salt concentrations were examined. Sodium chloride was added to the soil to obtain 20 and 60mM saline conditions. Solid humus was applied to the soil one month before planting and liquid humic acids were sprayed on the leaves twice on 20<sup>th</sup> and 40<sup>th</sup> day after seedling emergence. The application doses of solid humus were 0, 2 and 4 g/kg and those of liquid humic acids were 0, 0.1 and 0.2%. Salinity negatively affected the growth of corn; it also decreased the dry weight and the uptake of nutrient elements except for Na and Mn. Soil application of humus increased the N uptake of corn while foliar application of humic acids increased the uptake of P, K, Mg,Na,Cu and Zn. Although the effect of interaction between salt and soil humus application was found statistically significant, the interaction effect between salt and foliar humic acids treatment was not found significant. Under salt stress, the first doses of both soil and foliar application of humic substances increased the uptake of nutrients.

Chemical and Biochemical Properties of Humic Substances Isolated from Forest Soils and Plant Growth

2000 ◽  
Vol 64 (2) ◽  
pp. 639-645 ◽  
Author(s):  
S. Nardi ◽  
D. Pizzeghello ◽  
F. Reniero ◽  
N. Rascio
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Forest Soils ◽  
Biochemical Properties

Soil Augmentation by Humus: Replenishing lost soils and supplementing new ones

2021 ◽  
Author(s):  
Hemlata Bagla ◽  
Asma Khan
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Plant Growth ◽  
Humic Substances ◽  
Soil Degradation ◽  
Lunar Regolith ◽  
Radioactive Waste Disposal ◽  
Saline Stress ◽  
Plant Metabolites ◽  
Growth Phenomenon

&lt;p&gt;Earth&amp;#8217;s regolith consists of a vital component that is lacking on other planets &amp;#173;&amp;#173;&amp;#8211; the pedosphere or soil body &amp;#8211; that is rich in organic matter, soil fauna, minerals, water, gases, that together support life and is thus essential for plant growth. In stark contrast to our blue planet, Martian regolith is devoid of organic matter and contains crushed volcanic rocks, with high mineral content and toxic chemicals like perchlorates. Nevertheless, Martian and Lunar regolith simulants formulated by NASA, have been experimented for crop growth by addition of organic matter suitable to bind xenobiotics and provide ample nutrients, as an essential step towards expanding our horizon in the extensive field of soil sciences.&lt;/p&gt;&lt;p&gt;Soil is an ecosystem as a whole and acts as a modifier of planet Earth&amp;#8217;s atmosphere. The organic matter present in it originates mainly from plant metabolites with the onset of senescence and humification. Humic substances thus formed in the pedosphere exhibit exceptional characteristics for soil conditioning. Besides providing nutrients and aeration to the soil, they interact and bind with toxic heavy metals, radionuclides, pesticides, industrial dyes, and other xenobiotics that may be present as pollutants in the ecosystem, thus acting as natural sieves. As top soils have maximum organic matter, essential for plant growth, phenomenon like soil erosion leave the soils devoid of humic substances. Another major reason for soil degradation is excessive salinity, leading to osmotic and ionic stress in plants, eventually reducing their growth. Addition of humic acid in soils provides protection against high saline stress and minimizes yield losses. In India, one of the leading agrarian countries, it is a common practice to enrich soils with manure, which is an inexpensive form of humus-boost for the crops. Such practices aid the cyclic flow of organic matter in the environment, against the background of widespread soil degradation.&lt;/p&gt;&lt;p&gt;Another global form of soil degradation is radioactive contamination of soils which occurs mainly due to nuclear accidents and improper practices of radioactive waste disposal. In order to explore such interactions with humic acid following Green technique, batch biosorption studies were performed over a range of parameters, with radionuclides Cs and Sr that are found in low level radioactive wastes. Biosorption percentages of 91&amp;#177;2% and 84&amp;#177;1% were obtained for Cs and Sr respectively. The technique is chemical-free and emphasizes the &amp;#8216;nature for nature&amp;#8217; outlook of solving environmental problems. Humic acid and its various forms thus act as traps for radionuclides and work as excellent restorative soil stimulants that supplement depleted soils, boost plant growth, and play a vital role in sustaining life on Earth.&lt;/p&gt;

Stimulation of Plant Growth by Humic Substances

1976 ◽  
Vol 40 (6) ◽  
pp. 876-879 ◽  
Author(s):  
Yong Seok Lee ◽  
Richmond J. Bartlett
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Stimulation Of

scholarly journals A Meta-Analysis and Review of Plant-Growth Response to Humic Substances

2014 ◽  
pp. 37-89 ◽  
Author(s):  
Michael T. Rose ◽  
Antonio F. Patti ◽  
Karen R. Little ◽  
Alicia L. Brown ◽  
W. Roy Jackson ◽  
...  
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Growth Response ◽  
Meta Analysis ◽  
Plant Growth Response

EFFECTS OF HUMIC SUBSTANCES ON PLANT GROWTH

1988 ◽  
pp. 412-412 ◽  
Author(s):  
Y. Chen ◽  
T. Solovitch
Keyword(s):  
Plant Growth ◽  
Humic Substances

scholarly journals Assessing the potential of biochar aged by humic substances to enhance plant growth and soil biological activity

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Tereza Hammerschmiedt ◽  
Jiri Holatko ◽  
Vaclav Pecina ◽  
Dalibor Huska ◽  
Oldrich Latal ◽  
...  
Keyword(s):  
Plant Growth ◽  
Humic Substances ◽  
Microbial Biomass Carbon ◽  
C:N Ratio ◽  
Organic Amendments ◽  
Respiration Activity ◽  
Soil Microbial ◽  
Activated Biochar ◽  
Pre Treatment ◽  
The Impact

Abstract Background Soil carbon-rich organic amendments (biochar, humic substances) may improve the quality and fertility of arable soil. Their co-application can additively enhance the beneficial effect on soil. Hypothetically, the pre-treatment of biochar, by aging via soaking in a solution of commercially available humic substances, could result in synergism, which may exceed the benefit from simple co-application of both amendments to the soil. Therefore, the aim of this study was to investigate the impact of biochar, humic substances, the combination of both, and the impact of biochar aged by humic substances solution on soil microbial activities and plant growth in a short-term pot experiment with lettuce. Results The aging of biochar decreased the C:N ratio as compared to non-activated biochar. The co-application of biochar and humic substances into the soil resulted in the highest microbial biomass carbon and respiration activity. The majority of enzyme activities (β-glucosidase, arylsulfatase, N-acetyl-β-d-glucosaminidase, phosphatase) were the highest in humic substances-amended soil. The application of humic substances and biochar with humic substances seemed to stimulate microbial growth and activity followed by the competition of microflora for nutrients with plants, whereas the aged biochar behaved differently. The plants treated by aged biochar achieved the highest values of dry aboveground and root biomass of all variants. However, the assumed rapid uptake of nutrients by plants resulted in lower nutrient availability for microflora, and a decline in microbial viability. Conclusions Based on this study, the positive effect of co-applied humic substances and biochar on soil fertility, quality, and health can be concluded. The usability of biochar aging by humic solution requires further study. Graphic abstract

scholarly journals Acclimation with humic acids enhances maize and tomato tolerance to salinity

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Aline Costa Souza ◽  
Daniel Basílio Zandonadi ◽  
Mirella Pupo Santos ◽  
Natália Oliveira Aguiar Canellas ◽  
Cleiton de Paula Soares ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Salt Stress ◽  
Plant Growth ◽  
Humic Substances ◽  
Salinity Stress ◽  
Humic Acids ◽  
Proton Pumps ◽  
Maize Seedlings ◽  
Ion Balance ◽  
Tomato Seedlings

Abstract Background Salinity is one of the major environmental threats to agriculture, limiting plant growth and reducing crop yield. The use of humic substances to alleviate salt stress in plants is well reported, but the mechanisms remain unclear. This work aimed to apply humic acids on seedlings to acclimate plants to tolerate further salt stress exposition as a pre-treatment. Materials and methods Two independent experiments with mono (maize) and dicot (tomato) seedlings were carried out. Maize was primed by humic acids (4 mM C) and further submitted to moderate salinity exposition (60 mM NaCl). The acclimation period of maize seedlings was characterized by ion balance and transcriptomic analysis of salt response genes. The tomato seedlings were also primed by humic acids (4 mM C) and exposed further to salinity (200 mM NaCl), and we measured only physiological aspect, including the activity of plasma membrane proton pumps and net photosynthesis rate. Results Seedlings primed by humic acids minimized the salinity stress by changing ion balance, promoting plasma membrane proton pumps activity and enhancing photosynthesis rate and plant growth. We showed for the first time that maize seedlings treated with humic acids had a high transcription level of salt responsive genes and transcription factors even before the salt exposition. Conclusion Humic acids previously activate cellular and molecular salt defence machinery, anticipating the response and reducing salinity stress. This is a key knowledge to manipulate manufactured biostimulants based on humic substances towards a maximized crop protection. Graphic abstract

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