Changes in pH of soil supplemented with poultrymanure, wheat straw residues and urea
N applied alone or in different combinations to the soils under wheat–soybean cropping
system over three years (2008–09, 2009–2010 and 2010–1011) at two locations (Hajira
and Rawalakot) of district Poonch, Azad Jammu and Kashmir, Pakistan.