Biochar addition mitigates asymmetric competition of water and increases yield advantages of maize–alfalfa strip intercropping systems in a semiarid region on the Loess Plateau

Shuai Hou, Xingrong Sun, Guohao Chen, Kadambot H. M. Siddique, Zelin Chen, Fu Liu, Fu Liu, Hongtao Lai, Hongtao Lai, Yajing An, Yajing An, Zhixin Zhang, Luanzi Sun, Peizhi Yang, Peizhi Yang