Evaluation of Micronutrient Application at Different Growth Stages on Yield and Yield Components and Grain Quality of Sweet Corn

This study aimed to investigate the impact of micro fertilizer application (Iron and zinc alone or together as foliar application in 2.5 and 5 per thousand concentration or soil application in 15 or 30 kg.ha-1) and the fertilizers application time (control, soil application of fertilizers, spraying at vegetative growth stage, spraying in tassel stage, spraying in two phases of growth and tasseling stage, spraying in grain filling stage and spraying in three stages of growth, tasseling and grain filling) on growth and yield of maize (Zea mays convar. saccharata var. rugosa). The experiment was conducted in Islamic Azad University, Tabriz Branch during 2016 growing season as split plot using a randomized complete block design with three replications. According to the results of the study fertilizer treatments had statistically similar effects on seed of dry yield. All four treatments, soil application of fertilizers, spraying at vegetative growth stage, spraying at two stages of vegetative stage and tasseling and spraying at three stages of vegetative stage, tasseling and grain filling increased this trait similarly and increased seed dry yield by 20, 12, 21 and 22 percent which could be only due to increasing number of seeds produced. According to the survey results in just two treatments, soil application of 5 kg.ha-1 iron and foliar application of iron and zinc in the vegetative and early reproductive stage at a concentration of 5 per thousand, an increase of optimal gains, respectively 334850 and 271298 tomans net income per hectare, obtained.