Addition of walnut shells biochar to alkaline arable soil caused contradictory effects on CO2 and N2O emissions, nutrients availability, and enzymes activity

Tanveer Ali Sial, Sabry M. Shaheen, Zhilong Lan, Punhoon Khan Korai, Muhammad Imran Ghani, Muhammad Numan Khan, Ain-ul-Abad Syed, Main Noor Hussain Asghar Ali, İnayatullah Rajpar, Mehrunisa Memon, Saleem Maseeh Bhatti, Hamada Abdelrahman, Esmat F. Ali, Jörg Rinklebe, Jianguo Zhang