Humic substances and their role in the life processes

The soil consists of organic and inorganic substances, as well as live microorganisms. The major components of naturally occurring organic matters are humic substances. They are very important components of the soil, affecting soil physical and chemical characteristics, as well as improving soil fertility. Humic substances are formed by microbial degradation of dead plant matter. The major components of humic substances are: humic acid, fulvic acid and humin.
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The functions of humic substances:

  long-term accumulate nutrients and microelements necessary for the plant growth;
  improve nutrient cycling in vivo (both plant and animal);
  regulate intake of nutrient and water in soil;
  protect from external environment stressors and enhance plant and animal immunity;
  improve photosynthetic efficiency and increase chlorophyll content in plants, resulting in increased fruitfulness and plant resistance;
  effectively absorb toxic heavy metals and ensure clearance from organism, thus acting as bioregulators

Humic acids and fulvic acids intensify oxygen absorption in plant cells, stimulate root system development, increase cell membrane permeability, activates enzymes. The more intense is plant respiration, the more plant is able to produce biologically active substances, such as vitamins etc. and plant itself is healthier.



Internet resources:


  Kūdras apslēptā bagātība. Kristaps Baņķis, Latvijas Avīze, 2006. g. 23. martā

http://www.tvnet.lv/zinas/zala_zeme/174074-kudras_apslepta_bagatiba


  Humīnskābju ieguve no zemo purvu kūdras. V. Kampars, LZA akadēmiķis, Zinātnes Vēstnesis, 2000. gada 3. aprīlis: 7 (194)

http://www.lza.lv/ZV/zv000700.htm#8


  Latvijas kūdras resursu izmantošanas iespēju attīstība: humusvielas un to funkcionālie atvasinājumi vides un agrotehnoloģijām. no LU portāla:
http://www.lu.lv/par/projekti/petnieciba/2005/klavins/


  Kā veidojas augsnes organiskā daļa un humuss. Henriks Mežals, Dr. Agr, 2007.gada 26.jūnijā
http://www.saimnieks.lv/Darzkopiba/73


  What are Humic Substances? International Humic Substances Society
http://www.ihss.gatech.edu/whatarehs.html


  HUMIC SUBSTANCES: WHAT ARE THEY AND WHAT CAN THEY DO?
http://foliarfert.com/pages/humic_substances.htm


  Humic acid. From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Humic_acid


  About Humic Substances. The Humic Acid Research Group
http://www.hagroup.neu.edu/abouthafrm.htm


  Гуминовые вещества в биосфере. Д.С.Орлов, Московский государственный университет им. М.В. Ломоносова. СОРОСОВСКИЙ ОБРАЗОВАТЕЛЬНЫЙ ЖУРНАЛ, №2, 1997
http://www.pereplet.ru/nauka/Soros/pdf/9702_056.pdf


  Гуминовые вещества — вызов химикам XXI века. Ирина Васильевна Перминова, доктор химических наук, «Химия и жизнь» №1, 2008
http://elementy.ru/lib/430559


  Гуминовые вещества . Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона.
http://dic.academic.ru/dic.nsf/brokgauz_efron/33336/Гуминовые


  Влияние гуминовых веществ на рост и развитие растений
http://www.ecofaq.ru/stati/vlijanie-guminovyh-veshestv-na-rost--i-razvitie-rastenii.html

 
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