Total soil nitrogen (N) concentration and pH in water at wheat harvest.

DTPA: diethylene-triamine-penta-acetic acid The values represent the means and associated standard errors (SE) of 20 experimental units. Different superscript letters of the same type following the SE indicate statistical difference among the means of the three green manure treatments within each soil γ-irradiation treatment at p<0.05, according to least significance difference tests.