KARUKU G.N; KATHUMO V. M. Effects of Tillage Practices, Cropping Systems and Organic Inputs on Soil Nutrient Content in Machakos County, Kenya. Global Journal of Science Frontier Research, [S. l.], v. 18, n. D6, p. 23–35, 2018. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/2356. Acesso em: 5 may. 2024.