The Iraqi Journal of Agricultural Sciences 43 (3) : 42-51, (2012) Al-Azawi EFFECT OF KIND AND CONCENTRATION OF SALTS AND ORGANIC MATTER ON ELECTRICAL CONDUCTIVITY AND SOIL REACTION UNDER LEACHING CONDITIONS | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 43, Issue 3, July 2013, Pages 42-51 | ||
| Author | ||
| Kadhim M. N. Al-Azawi | ||
| Abstract | ||
| A laboratory experiment was conducted to reveal the effect of kind and concentration of salts and organic matter on electrical conductivity (EC)and soil reaction (pH) values in a calcareous silty clay texture soil from Abu Ghraib area. Soil was treated with three kinds of salts (sodium chloride NaCl , calcium chloride CaCl2 , and mixed salt of 1 : 1 NaCl : CaCl2) , in three EC values 10 , 20 , 30 dS.m-1, organic matter (petmose) was added in two levels 0 , 2. 5% . Soil was packed in polyethylene columns of 40 cm height and 10 cm diameter. Soil moisture was about 33 k. Pa. then leaching process of soil columns was conducted for five successive times using tap water of 10 cm head (785 ml per each leaching). Liquates were collected after each leaching . Columns were cut at 0-8 , 9-16 and 17-24 cm to represent layers A, B, and C . Soil samples were taken from soil layers to conduct the appropriates analysis .Results showed a significant increase in EC values of soil when salts added to it. NaCl treatment was superior followed by the mixed salts than the CaCl2. Values were positively increased with increasing salts levels added to soil. A nonsignificant decrease was also occurred in soil reaction values before leaching started. Organic matter contributed in increasing values of EC in soil with no significant decrease in soil reaction values for all treatments.Leaching process led to a significant decrease in EC values of soil for NaCl , mixed salt and CaCl2 treatments while there was a non significant decrease in soil reaction values . Leaching process also led to remove the largest quantity of salts from A , B, then C layers , and also led to a non significant decrease of EC values of soil liquates gathered for C3 , C4 levels. Added organic matter led to increase the drop in EC values and soil reaction after each leaching process , there was also a negative relationship between EC and pH values. | ||
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