The impact of agricultural systems in the soil organic matter content in brazilian cerrado - Loss, Ana Carolina; Pereira, Marcos Gervasio; Beutler, Sidinei Julio; Perin, Adriano; Piccolo, Marisa de Cassia; Assunção, Shirlei Almeida; Zonta, Everaldo (International Journal of Research -GRANTHAALAYAH, 2019)