VERMA, H.P.; CHOVATIA, P.K.; SHARMA, Seema; SHIVRAN, A.C. Growth and yield of cowpea as influenced by nitrogen and phosphorus levels on medium black soils of Gujarat. Annals of Agricultural Research, India, v. 36, n. 4, 2016. Disponível em: https://epubs.icar.org.in/index.php/AAR/article/view/55624. Acesso em: 25 oct. 2025.