Investigating the effects of biochar on irrigation water use efficiency and nitrogen use efficiency in Karla plant under water stress conditions

Document Type : Research Paper


1 water enjineering zabol university

2 university of zabol



In this research, the effect of biochar on the efficiency of irrigation water consumption and the efficiency of nitrogen consumption at different levels of water and nitrogen fertilizer for karla plant was investigated. The experiment was carried out in the greenhouse conditions in a factorial manner and in the form of a completely random design with three replications. The treatments include three irrigation water treatments (I1) 50, (I2) 75 and 100 (I3) percent of irrigation water, four biochar treatments (zero (B1), 1.25 (B2), 2.5 (B3) and 5 (B4) weight percentage of pot soil) and three nitrogen fertilizer treatments (50 (N1), 75 (N2) and 100 (N3) percent of plant fertilizer requirement). Water stress levels during the growing season were measured by weighing the pots daily and compensating for the lack of soil water during irrigation by adding the required amount of water to them, and the amount of water added to each pot was also measured during the growing season. Harvesting was done once a week. A total of five harvests were done. The yield and efficiency of irrigation water consumption and the efficiency of nitrogen consumption and soil salinity were calculated at the end of the growing season in each treatment. Also, soil nitrogen and fruit sugar were measured in each harvest. The results showed that the effects of irrigation water and biochar levels on the measured parameters were significant at the probability level of one and five percent. With the reduction of irrigation water, the yield of the plant decreased. The highest amount of yield (15.5 tons per hectare) was obtained from the treatment of 100% of the amount of irrigation water, which was not significant with the treatment of 75% of irrigation water. The use of biochar up to 2.5 percent by weight of the soil increased the yield. More use of biochar (5% by weight of soil) decreased plant yield. The highest water consumption efficiency (3.14 kg/m3) and nitrogen consumption efficiency (94.55 kg/kg) were obtained with the use of 75% nitrogen fertilizer (150 kg/ha) and 2.5% by weight of biochar. The use of the appropriate amount of biochar reduced the negative effects of moisture stress in comparison with the control.


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