Sorghum–grass intercropping systems under varying planting densities in a Semi-Arid Region: focusing on soil carbon and grain yield in the conservation systems - Ferraz-Almeida, Risely; Albuquerque, Carlos Juliano Brant; Camargo, Reginaldo; Lemes, Ernane Miranda; Faria, Renato Soares de; Lana, Regina Maria Quintão (Agriculture, 2022)