International Journal of Agricultural Research 4 ( 10 ): 297 - 309 , 2009
International Journal of Soil Science 4 ( 2 ): 57 - 66 , 2009
International Journal of Soil Science 5 ( 1 ): 26 - 33 , 2010
International Journal of Soil Science 5 ( 2 ): 62 - 72 , 2010
International Journal of Soil Science 5 ( 3 ): 196 - 205 , 2010