Six treatments were tested in a complete block design: (A) mineral fertilizer (NKP) an optimal dose
(according to the Iran fertilization guidelines), (B) sub fertilization (2/3 of the optimal dose), (C) sub
fertilization (1/3 of the optimal dose), (D) animal manure 60 t h-1( an optimal dose), (E) 1/2 of animal
manure plus 1/2 of mineral fertilizer and (F) control.