The effect of Chlormequat chloride and Zinc sulfate on dry matter remobilization and grain yield of wheat under Nitroxin inoculation under dry land farming conditions

In order to investigate remobilization efficiency and wheat grain yield, this research was conducted as two factorial experiments using a randomized complete blocks design with three replications at two sites in Ilam and Bushehr during 2013-14 cropping year. The experimental factors were including application of two levels of Chlormequat chloride concentration (zero and 2.5 gram per liter), Zinc sulfate at the three rates (zero, 25 and 50 kilogram per hectare) and Nitroxin at two levels (seed inoculated and non-inoculated). The results showed that Chlormequat chloride application had significant effect at one percent probability level on spike to stem dry weight ratio and remobilization rate of dry matter of stem. With consumption of 2.5 gram per liter Chlormequat chloride, spike weight to stem compared to control increased by the amount of 20.4 percent and remobilization rate of stem dry matter decreased to 2.4 percent. In addition, application of Chlormequat chloride had significant effect on yield and grain yield components and water use efficiency at the statistical probability level of one percentage. Chlormequat chloride foliar application increased spike number per meter square, grain number per spike, grain yield and water use efficiency by the amount of 14.6, 19.1, 28.5 and 29.3 percentages, respectively. The highest amount of remobilization (64.8 gram per square meter), remobilization efficiency (32.1 percentage) and contribution of remobilization (50.8 percentage) was related to interaction treatment without application of Chlormequat chloride, using 50 kilograms per hectare of zinc sulfate and using Nitroxin. The highest grain yield (1710 kilogram per hectare) from the interaction of foliar application treatments of Chlormequat chloride at concentration of 5.2 gram per liter, application of 50 kilogram per hectare zinc sulfate and inoculation of seed with Nitroxin was obtained. Generally, it can be concluded that, the application of Chlormequat chloride, zinc sulfate and Nitroxin might be effective in improvement and increasing the grain yield of wheat under dry land farming conditions.