Soil respiration, root traits and dry matter yield of sorghum (Sorghum bicolor L.) as affected by biochar application under different cropping patterns and irrigation method
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Department of Horticultural Science and Agronomy, Science and Research Branch, Islamic Azad University, Tehran, Iran, P.O. Box: 14778-93855
Department of Agronomy, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran, P.O. Box: 61349-37333
Department of Agronomy, Karaj Branch, Islamic Azad University, Karaj, Iran, P.O. Box: 31499-68111
Final revision date: 2020-11-18
Acceptance date: 2020-11-23
Publication date: 2020-12-21
Corresponding author
Mojtaba Alavifazel   

Departments of Agronomy, Ahvaz Branch, Islamic Azad University, 61349-37333, Ahvaz, Iran
Int. Agrophys. 2020, 34(4): 495-502
This study aimed to investigate the effect of alternate furrow irrigation accompanied by biochar application within different cropping patterns on soil respiration and root traits such as root dry weight and root volume associated with the dry matter yield of sorghum (Sorghum bicolor L.) over a two-year period (2017 – 2018). The treatments consisted of three irrigation methods, which included every furrow irrigation, fixed furrow irrigation and alternate furrow irrigation and two cropping patterns including one-row, two-rows and three levels of biochar application including 0, 6 and 12 t ha-1. Different irrigation levels had a significant effect on root morphological indices, soil respiration, and the dry matter of forage yield. Biochar application showed a significant influence on soil respiration, as the highest soil respiration was observed in the B2 and B1 treatments (0.173 and 0.171 µmol C g-1 soil h-1, respectively), in contrast, the least was observed in the control treatment B0 (0.168 µmol C g-1 soil h-1). Biochar application had a positive effect on root dry weight, root volume and dry matter yield due to the prevention of severe moisture loss and further yield loss.
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