Ramírez , Homero, Malendres-Álvarez Aarón Isain, Alejandro Zermeño-González, Diana Jasso-Cantú, and José ´Ángel Villarreal-Quintanilla. 2021. “Influence of P-Ca on Cytokinins in Xylem Sap and on Stomatal Resistance in Apple”. Ecosistemas Y Recursos Agropecuarios 8 (1). https://doi.org/10.19136/era.a8n1.2580.