• Thounaojam Thomas Meetei
• Yumnam Bijilaxmi Devi
• Thounaojam Thorny Chanu
• Hrishikesh Upadhyaya

Acid soil is a condition where the pH scale of the soil is less than 7. Most of the basic cations present in the exchange site of the soil have been replaced by the H+ ion from different sources. It is widely belief that different natural processes take part in soil acidification. But with human intervention the process of soil acidification is accelerated making the soil unfit for crop production. With increase in acidity of soil there is a decrement of most of the macro nutrient present. Activities of different beneficial microorganisms have been hampered. Solubility of heavy metal increases making vulnerable to certain human disease. Soil acidity can be determined by the activities of H+ in the soil solution which is called as pH. Soil pH is one of the most important attributes for soil quality point of view, which greatly influence different soil chemical reactions and processes. Among the types of soil acidity, active and exchangeable acidity has significant effect in soil health and activities of different microbial population. So, neutralizing acid soil is confined to only active acidity and some part of exchangeable acidity. For, ameliorating acid soil there are many management practices. Among them liming is considered most important. Different liming materials are present which produced OH- during hydrolysis reaction in the soil, and this OH- ion neutralised the H+ ion which were initially present in the soil or as a by-product of Al hydrolysis. For a proper soil health, soil acidity management is very important for sustainable crop production. So, understanding different process of soil acidification is a need for proper management.

Soil, Acid Soil, Hydrolysis

"Acid soil: Unwanted but unavoidable consequences of natural processes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.1081-1092, December 2018, Available :http://www.jetir.org/papers/JETIRDT06176.pdf

"Acid soil: Unwanted but unavoidable consequences of natural processes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp1081-1092, December 2018, Available at : http://www.jetir.org/papers/JETIRDT06176.pdf