Document Type : Research Paper

Authors

1 Assistant Professor, Seed and Plant Improvement Institute (SPII), Agriculture Research, Education and Extension Organization (AREEO), Karaj, Iran

2 Associate Professor, Seed and Plant Improvement Institute (SPII), Agriculture Research, Education and Extension Organization (AREEO), Karaj, Iran.

3 Assistant Professor, Horticulture Crops Research Department, Isfahan Agricultural and Natural Resources Research and Education Center, AREEO, Isfahan, Iran

4 Associate Professor, Department of Agronomy Sciences and Plant Breeding, College of Aburaihan, University of Tehran, Tehran, Iran.

Abstract

To identify the limiting factors in forage maize production in Iran, this study was carried out in order to separate the effective and influential management factors in forage maize production in the country with data which obtained from 43 final reports or extracted articles from them in Agricultural Research, Education and Extension Organization (AREEO) with meta-analysis method. According to the results, plant density 5.65%, drought stress -13.44%, cultivar 0.31%, planting date 2.54% and nitrogen fertilizer 24% justified the amount of forage maize variation. Based on the results of this study, forage yield was increased by about 9.49%, with increasing in plant density between 80 to 100 thousand plants per hectare. Maize forage yield was decreased significantly under mild stress, severe stress and very severe drought stress, by 25.30%, 14.38% and 8.99%, respectively. Also, for different cultivars and different groups of maturity, group-700 had a significant increase of 3.83% compared to other groups. For the planting dates of forage maize compared to the control, which is the first half of June, a decrease in forage yield was observed. Finally, the highest percentage of increase in maize forage yield was obtained from the use of 450 kg ha-1 of urea fertilizer. Overall, nitrogen fertilizer, drought stress and planting density were recognized as the most important factors affecting corn forage yield in Iran, respectively.

Keywords