Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 48 1 2017 05 22 Study the effect of vetch (Vicia pannonica) as a first season sowing and green manure along with nitrogen fertilizer levels on forage maize yield Study the effect of vetch (Vicia pannonica) as a first season sowing and green manure along with nitrogen fertilizer levels on forage maize yield 1 9 62652 10.22059/ijfcs.2017.139259.654005 FA Meysam Taheri Former M.Sc. Students, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran Farhad Bayat Former M.Sc. Students, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran Hossein Moghaddam Assistant Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran Naser Majnoon-Hosseini Professor, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran 0000-0003-2807-9673 Journal Article 2015 12 28 To investigate the effect of vetch as a first season crop and green manure with different levels of nitrogen fertilizer on forage maize yield (as a second crop) a research was conducted at research farm of agricultural and natural resources, the University of Tehran in the year 2012-2013. Experiment arranged as a double split-plot based on randomized complete block design with three replications with double crop cultivar (<em>Vicia pannonica</em>) and forage maize (<em>Zea mays</em> L.). The main plots consisted of pre-sowing treatments of a fallow plot, vetch as a forage as well as a green manure, and nitrogen fertilizer as a subplot at three levels (zero, 50% and 100 standard limits), the sub-sub plots included two vetch cultivars (i.e. Simon and ZP677). The results indicated that the forage maize dry weight in pre-sowing treatments of forage and green manure produced 26.6% and 22.8% than the fallow treatment, respectively. Likewise, the cob dry weight in pre-sowing treatments of forage and green manure provided 45.6% and 48.7% than the fallow treatment, respectively. The maize leaf dry weight was higher of about 15.8% and 20.9%, respectively in forage and green manure treatments in comparison to the fallow treatment. Overall, it can be inferred that with the increase of nitrogen in forage maize cultivation some of the characteristics of the forage are directly affected and cause significant changes in forage yield. To investigate the effect of vetch as a first season crop and green manure with different levels of nitrogen fertilizer on forage maize yield (as a second crop) a research was conducted at research farm of agricultural and natural resources, the University of Tehran in the year 2012-2013. Experiment arranged as a double split-plot based on randomized complete block design with three replications with double crop cultivar (<em>Vicia pannonica</em>) and forage maize (<em>Zea mays</em> L.). The main plots consisted of pre-sowing treatments of a fallow plot, vetch as a forage as well as a green manure, and nitrogen fertilizer as a subplot at three levels (zero, 50% and 100 standard limits), the sub-sub plots included two vetch cultivars (i.e. Simon and ZP677). The results indicated that the forage maize dry weight in pre-sowing treatments of forage and green manure produced 26.6% and 22.8% than the fallow treatment, respectively. Likewise, the cob dry weight in pre-sowing treatments of forage and green manure provided 45.6% and 48.7% than the fallow treatment, respectively. The maize leaf dry weight was higher of about 15.8% and 20.9%, respectively in forage and green manure treatments in comparison to the fallow treatment. Overall, it can be inferred that with the increase of nitrogen in forage maize cultivation some of the characteristics of the forage are directly affected and cause significant changes in forage yield. https://ijfcs.ut.ac.ir/article_62652_130366f12449f97df3ff4f3d9fbc916b.pdf