effects of zn, mn and fe fertilizers on quantitative and qualitative yield of bread wheat cultivar pishtaz

an experiment was conducted in the experimental field of seed and plant improvement institute in karaj for three consecutive cropping seasons, 2001-2003, to study the effects of eight different fertilizer treatments including some microelements on grain yield and protein content of a bread wheat cultivar pishtaz. the experiment was in a rcbd with three replications.eight fertilizer treatments were: npk (control), npk-an, npk-fe, npk-mn, npk-zn, npk-fe-mn, npk-mn-fe, npk-mn-zn and npk-fe-mn-zn. to provide the experimental treatments, 10 kgh-a secostrin 138, 40 kgha-1 sulphate of zinc, and 30 kgha-1 sulphate of magnesium were added to npk. based on the results, the highest grain yield was obtained from the npk-fe-mn-zn treatment with a yield increase of 900 kgha-1 comparing with the check treatment (npk). other treatments with different microelements also caused increase in yield. protein contents of grains obtained from the treatments containing zn + mn, zn and mn increased by 5.2, 4 and 3.2 percent, respectively.