Effect of soil application of Fe and ZnSO4 on grain yield and yield components of wheat at different sowing dates

Because of the lack of micro fertilizer in farm grain tillage, determining suitable level, time, and method to improve agriculture, is very important. To investigate sowing date and the effect of the micro nutrient (Fe and ZnSO4) on wheat grain yield and yield components, a split plot experiment was conducted based on Randomized Complete Block Design with three replications in Arsanjan region in 2009-2010. Sowing date (21 November, 6 and 21 December) was intended as main factor and control level without use of micro fertilizer and 10, 20 Kg Fe and 40, 80 Kg ZnSO4 as the secondary factor. Adding Fe in sooner sowing date, number of grain in spike, number of spike in square meter, grain yield and biologic yield, increased 4.2, 1.6, 1.3, 2.2 and 1.4 times respectively increased comparing with one month sowing delayed and not using micro fertilizer. Also, similar results were obtained by using 80 kg/ha ZnSO4. More consumption of micronutrient fertilizers in later sowing to some extent can compensate damage resulted from planting delays.