Abstract
Columns experiment was conducted at the laboratory of Soil Sci. Dept., Fac. of Agric., Menoufia Univ., Shebin Elkom, Egypt to study impact of two organic amendments (biochar and compost derived from rice straw) application to sandy soil samples collected from Gabal Quisna, Minoufia governorate (30° 31ꞌ 37.63ꞌꞌ N, 31° 10ꞌ 7.52ꞌꞌ E) on its EC, pH and content of soluble NH4, NO3, P and K. This study was carried out using columns of polyethylene and prior to packing the columns. The prepared soil samples were mixed and thoroughly homogenized with 0.00, 0.75, 1.50 and 3.00% compost (RSC) and/or 0.00, 0.75, 1.50 and 3.00% biochar (RSB). All soil columns were supplied by nutrient solution (Hewitt and smith, 1975), moistened to field capacity level and incubated at the room temperature for 25 days. At the end of incubation period, all soil columns were leached by water to 180% WHC of the studied soil for 3 times with a ten-day interval. The obtained results indicated that, increasing biochar rates led to an increase of pH, EC and soluble content of K and a decrease of soluble NH4+, NO3- and P in the leachate. The compost applications conduced to an increase of EC, soluble NH4+, NO3-, P and K and a decrease of pH in the leachate.
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