Characterization Of Acid Soil And Lime Requirement Of Bishnupur District, Manipur
Publication Date : 04/03/2017
Soil acidity has been recognized as an important agricultural problem, which adversely affects the crop production, directly or indirectly. The fertility status of such acid soils is very poor and the crop grown on such problematic soils have lower yield. Problem of soil acidity is acute in hilly states like Manipur, where the common problems are low pH, low CEC (due to dominance of 1:1 type of clay) and low base saturation (16 - 67 %). Therefore, the present research entitled “Characterization of acid soils and lime requirement of Bishnupur district, Manipur” was undertaken with forty eight soil samples; twenty four samples each from Bishnupur block (viz., Toubul, Khoijuman, Kwasiphai and Kabowakching) and Moirang block (Phubala, Tronglaobi, Keirenphabi and Ethai) of Bishnupur district of Manipur during 2011. The soils were found to be of heavy in texture and ranged from clay loam to clay while the pH ranged between 4.44 to 6.42 which were considered as strongly acidic to slightly acidic. The cation exchange capacity of the studied samples varied from 7.80 to 17.80 Cmol (p+) kg-1 soil and organic carbon contents were high and ranged between 0.75 and 2.16 per cent. Exchangeable bases (Ca++ and Mg++) ranged from 3.30 to 6.10 Cmol (p+) kg-1 and 1.50 to 4.00 Cmol (p+) kg-1, respectively. Total Potential Acidity ranged from 3.80 to 7.00 Cmol (p+) kg-1, Extractable Acidity from 0.07 to 0.35 Cmol (p+) kg-1 and pH Dependent Acidity from 3.67 to 6.87 Cmol (p+) kg-1. However, there is closer correlation value between total potential acidity and pH dependent acidity, thus pH dependent acidity has dominant influence than exchange acidity. Most of the soils of Bishnupur District, Manipur is under strongly acidic to slightly acidic range, thus high doses of lime amendments is required for desirable crop production. Therefore, it is needed to adopt suitable remedial counter measures other than liming.
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