Study some of morpho- physiological characteristics, dry matter remobilization and grain yield of wheat underChlormequat chloride, Zinc sulfate and Nitroxin application

Remobilization of reserves from stem during maturity is important in the case of grain yield of wheat under drought stress. Annual field experiments were carried out at two sites: Ilam (52 ◦ 50 N, 1 ◦ 14 W) and Bushehr provinces (45 ◦ 46 N, 03 ◦ 09 E) during 2013-2014 growing seasons. In these experiments conducted in completely randomized block with three replications, effects of three main factors including two concentration levels of chlormequat chloride (CCC) (0, 2.5 g.lit-1), application of Zinc sulfate (Zn) at the three rates of 0, 25 and 50 kg ha-1 and Nitroxin (Nit), as biofertilizer, (inoculated and non-inoculated seed) investigated on morpho-physiological traits of bread wheat cultivar of Kohdasht. Results showed that CCC application significantly decreased plant height and amount of remobilized stem reserves. Nit inoculation increased plant height, amount of remobilized dry matter (ARDM), and contribution of stem reserves to grain yield production (REP). Zn significantly increased stem dry matter weight. CCC× Zn × Nit interaction for ARDM, REE and REP was found to be significant. The highest amounts of ARDM, REE and REP were obtained from plants of Nit-inoculated seeds applied with 50 kg ha-1 zinc sulfate and with no CCC application. Generally, it seems CCC, Zn and Nit were effectiveness in improvement and increasing grain yield of wheat under dryland farming.