Cross section of the leaf blade in plants in maize plants fertilized with three organic sources (castor cake, physic nut seedcake, and vermicompost), using a control with urea and another without fertilizer application. A and B: control; C: urea; D: physic nut seedcake; E: vermicompost; F: castor bean cake. ead: adaxial epidermis; eab: abaxial epidermis; fi: fibers; fl: phloem; xi: xylem; mp: microhair; cb: bulliform cell; pm: chlorophyllin parenchyma of the mesophyll; vv: chlorophyllous parenchyma of the vascular sheath. Scale bar: 30 µm.