بررسی اثر سطوح مختلف محلول‌پاشی کود سولفات آهن بر ارقام سویا در منطقه ورامین

This research was conducted with the evaluation effect of Iron-Sulfate (FeSo4) spray levels in flowering stage on Soybean varieties in Varamin region in studies field of Varamin University in Ghalehsin at 2009. Factors examination in this experiment to sow Iron Sulfate fertilizer  in flowering stage in four levels 34%, 67%, 100% & 133%,the amount lab recommend to experiment to three Soybean varieties (Kelark, JK, M7). practices were Split factorial design as a randomized complete block design in three replicates were randomly assigned, in which Iron Sulfate spray in main plots and Soybean varieties were subplots. Cultivated as a spring and after kidney transplantation care during crop growth and phonological stages was done with the yield components and yield and quality, harvest index and physiological parameters in all treatments were repeated or were taken and then compared average using SAS program and using Duncan test.Increase in amounts of Iron sulfate fertilizer spray levels until 100% lab recommend in this test to cause increased grain yield, weight of 100 grain, average of a pod length, average number of seeds per pod, protein percentage, bush height, middle node length, leaf area index, number of pods per plant, wet & dry biomass, crop growth rate and net absorption rate and traits such as oil percentage and harvest index were creased. Surfaces of Iron sulfate fertilizer spray levels did nonsense affect upon others characteristic of examination and also did nonsense difference of Iron sulfate fertilizer spray levels until 133% lab recommend with 100% lab recommend. In experiment among figures of to examination in Varamin region climate situation, Jk variety that more later growth figure,  have more rate in experimented characteristic such as grain yield in hectare, crop growth rate, net absorption rate, leaf area index, weight of 100 grain, average number of seeds per pod, bush height, wet & dry biomass. But M7 variety demonstrated more rate oil & protein percentage.