I am wanting to expand my business by offering fertilization to my list of services. The only problem is that I know very Little about fertilizing. So I have complied a list of questions. What types of fertilizer should I use during: -Spring? -Summer? -Fall? -And before winter? -How many times a year should I fertilize? -Where should I buy fertilizer? -Are there certain times that are best for fertilizing; Such As: -When it s Hot? cold? -Should you fertilize: before it rains? or after it rains? -should you fertilize when it is dry? -What time of day it best? night day? afternoons? -how much should I charge per SQ. Ft. o yeah...and I live in Kansas and work with mainly bluegrass and fescue. and this applies for small residential lawns under about 10,000 sq. ft.