The purpose of this rulemaking is to revise the investigational allowance, as defined in s. 576.011, Florida Statutes, for boron, copper, iron, manganese and zinc micronutrients and establish a date by which such allowances are effective and other allowances are repealed in rule. The effect of this rulemaking will be to revise investigational allowances for fertilizer deficiencies in rule for the above micronutrients to account for contributions from sampling (taking of an official sample of fertilizer) and for variations not included in the current investigational allowances.