Effect of Pyrolysis Temperature on Some Physicochemical Properties of Biochar Derived from Pruning Waste of Mature Pistachio Trees

Production and soil application of biochars derived from crop residue is known as an environmental friendly strategy for increasing soil health and quality. Therefore, the present study aimed to elucidate the effect of 4 pyrolysis temperatures (350, 400, 450, and 500 °C) on the physicochemical properties of biochar derived from pistachio pruning. The results showed that increasing pyrolysis temperature up to 500 °C increased electrical conductivity, pH, K, Na and P by 32%, 27%, 27%, 25%, and 29% compared to the pyrolysis temperature of 350 °C, respectively. While the increasing trend in Ca, Mg and Zn content was significant up to 450 °C, there were no significant difference in   Ca, Mg and Zn content at pyrolysis temperatures of 450 and 500 °C. The results also, confirmed the positive effect of pyrolysis temperature on specific surface area as well as porosity. Overall, it was concluded that the biochar derived from pistachio pruning woods is rich in plant nutrients and can be used as a source of nutrient supply for plants. It can also act as a soil amendment and improve plant performance.