BIOCHAR EFFECTS ON COPPER AVAILABILITY AND UPTAKE BY SUNFLOWER IN A COPPER CONTAMINATED CALCAREOUS SOIL
|Mina Sharifat Salmani1*, Farhad Khorsandi2, Jafar Yasrebi3 and Najafali Karimian3
|Corresponding Author: Mina Sharifat Salmani, E-mail: [email protected]|
|Received: 04 April 2014 Accepted: 26 May 2014|
|Related article at Pubmed, Scholar Google|
Biochar, a carbon rich soil amendment, could be beneficial in decreasing copper toxicity in plants. An open air, pot experiment was carried out to study the effects of biochar on soil available copper and sunflower yield and Cu uptake under copper toxicity stress. The experimental design was complete randomized block with three levels of copper fertilizer (0, 50 and 200 mg/kg), four levels of citrus wood biochar (0%, 1%, 2% and 4% by weight) and three replications. The results showed that application of biochar at medium and high Cu toxicity levels can significantly reduce available Cu level in calcareous soil, thereby, significantly reducing Cu concentration in sunflower aerial parts to normal levels. Cu uptake by sunflower also decreased significantly by biochar application to soil. Considering the results of this experiment, it is recommended to use at least 1 % and at most 2% citrus wood biochar under medium to high Cu toxicity conditions.