Which Method of Application Generally Would Require the Greatest Amount

Multiple Choice

Which method of application generally would require the greatest amount of iron to alleviate an iron deficiency in an orange grove?

A) application of iron chelate to the soil in localized pockets
B) application of iron chelate to soil evenly with thorough mixing
C) foliar spray of iron chelate
D) application of iron sulfate to soil in localized pockets
E) application of iron sulfate to soil evenly with thorough mixing