VAN AVERBEKE, W.; JUMA, K.; TSHIKALANGE, T. Yield response of African leafy vegetables to nitrogen, phosphorus and potassium: The case of <i>Brassica rapa</i> L. subsp. <i>chinensis</i> and <i>Solanum retroflexum</i> Dun. Water SA, [S. l.], v. 33, n. 3, p. 355–362, 2018. DOI: 10.4314/wsa.v33i3.180595. Disponível em: https://www.ajol.info/index.php/wsa/article/view/180595. Acesso em: 28 sep. 2026.