Investigating the effect of Conocarpus biochar on the yield and water efficiency of fodder sorghum under conditions of quantitative and qualitative water limitation.

Document Type : Research Paper

Authors

1 Phd Candidate of irrigation and drainage, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz

2 Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Khuzestan , Iran.

3 Professor Irrigation Dept., Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz

4 Water Resources Management Group, Wageningen University and Research, the Netherlands.

Abstract

Saline drainage water are known as a problem, but by creating management approaches, drainage water can be made in line with sustainable development by compensating for the limitation of water resources. Biochar is a soil additive and a management approach in agriculture. In this research, the effect of different levels of irrigation water salinity (2.5, 5 and 10 dSm-1, S1, S2 and S3), biochar (zero, 1 and 2%, B0, B1 and B2) and water supply (60, 80, 100 and 120%, M1, M2, M3 and M4) in the form of factorial split plot experiment in time in the form of randomized complete block, in three replications during the years 2018 and 2019 in the research farm of Shahid Chamran University, Ahvaz, on yield and water efficiency Fodder sorghum was investigated in three harvests. The results showed that the effect of different levels and their interaction effects on the yield and efficiency of fresh and dry sorghum water consumption is significant at the level of 1%. The highest and lowest fresh yields were obtained in B2S1M4 and B2S3M1 treatment (20.52, 135.52 t ha-1). The lowest fresh and dry water productivity of fresh and dry fodder was obtained in B2S3M3 treatment with values of 2.5 and 0.91 kgm-3. Treatments B2S1M3 and B2S1M2 had the highest productivity of fresh and dry fodder water, 10.54 and 4.4 kgm-3, respectively. In irrigation conditions with saline water, the yield and productivity of fresh fodder is sensitive to the amount of biochar, in such a way that in supplying 100% of the water requirement with saline water (10 dSm-1), adding 1 and 2% causes a change of +2.6% and -4.7% in performance and +1.9% and -2.5% in the efficiency of fresh fodder water consumption.

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