JOSEPH, Mercykutty; SUDHAKUMARI, B. Assessment of Zinc Availability in the Ultisols of South India under Rubber Cultivation. Journal of the Indian Society of Soil Science, India, v. 61, n. 1, 2013. Disponível em: https://epubs.icar.org.in/index.php/JISSS/article/view/31752. Acesso em: 17 jul. 2026.