This unit teaching guide is designed to help teachers explain the principles of fertilizer and lime use. The first of four major sections is a teaching outline keyed to transparency masters and student handouts. Thirteen major areas are covered in the teaching outline: (1) plant needs; (2) uses of fertilizer; (3) nutrients for plant growth; (4) planning the fertilizer program based on the soil test; (5) classification of fertilizers; (6) some types of nitrogen, phosphorus, and potassium fertilizers; (7) reading the fertiizer label; (8) soil pH and the use of limestone; (9) rate of application; (10) time of application; (11) application methods; (12) consideration for fertilizer selection and application; and (13) student application exercises. Sections 2 and 3 contain student handouts and a list of teacher and student references. The final section contains overhead transparency masters that complement the unit. (LRA)