University of Tehran perss Journal of Crops Improvement 2008-8337 24 4 2022 12 22 Evaluation of Light Use Efficiency and Nitrogen Derived from the Atmosphere in intercropped of Soybean and Sesame Evaluation of Light Use Efficiency and Nitrogen Derived from the Atmosphere in intercropped of Soybean and Sesame 1019 1033 86051 10.22059/jci.2022.324885.2560 FA Rahmat Abasi Corresponding Author, Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural sciences and Natural Resources ‎University, Sari, Iran‎. E-mail: r.abasi@sanru.ac.ir Meisam Namdari Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural sciences and Natural Resources ‎University, Sari, Iran. E-mail: m.namdari.stu@sanru.ac.ir Journal Article 2021 05 31 A field experiment has been carried out to study the competition between soybean and sesame in different planting ratios of intercropping based on replacement method. It is based on a randomized complete block design with four replications at Sari Agricultural Science and Natural Resources University during 2019. The planting ratios are 0:100, 25:75, 50:50, 75:25, and 100:0 (Soybean: Sesame respectively), using replacement method. Results show that intercropping has had a significant effect on the percentage of N derived from the atmosphere and light use efficiency. Among the different planting ratios, the maximum amount of biological nitrogen fixation is related to the 90-days after planting, and the 75:25 and 25:75 planting ratios have had the highest (75.95%) and lowest activity rates (42.67%), respectively. In addition, the highest light use efficiency in intercropping is related to the 120-days after planting. At this stage, the light use efficiency in 75:25 and 50:50 ratios are 2.03 and 1.92 g.MJ.^-1, respectively. The highest land equivalent ratio is 50:50, with an average of 1.12. Finally, increasing the light use efficiency in planting ratios of 75:25 and 50:50 prove to be essential in increasing soybean's biological nitrogen fixation and increasing the efficiency of intercropping cultivation. A field experiment has been carried out to study the competition between soybean and sesame in different planting ratios of intercropping based on replacement method. It is based on a randomized complete block design with four replications at Sari Agricultural Science and Natural Resources University during 2019. The planting ratios are 0:100, 25:75, 50:50, 75:25, and 100:0 (Soybean: Sesame respectively), using replacement method. Results show that intercropping has had a significant effect on the percentage of N derived from the atmosphere and light use efficiency. Among the different planting ratios, the maximum amount of biological nitrogen fixation is related to the 90-days after planting, and the 75:25 and 25:75 planting ratios have had the highest (75.95%) and lowest activity rates (42.67%), respectively. In addition, the highest light use efficiency in intercropping is related to the 120-days after planting. At this stage, the light use efficiency in 75:25 and 50:50 ratios are 2.03 and 1.92 g.MJ.^-1, respectively. The highest land equivalent ratio is 50:50, with an average of 1.12. Finally, increasing the light use efficiency in planting ratios of 75:25 and 50:50 prove to be essential in increasing soybean's biological nitrogen fixation and increasing the efficiency of intercropping cultivation. https://jci.ut.ac.ir/article_86051_88c22ca514eecd450452539e33211b86.pdf