Frequency of foliar application of fertilizers depend upon the needs of the plant as judged by deficiency symptoms, growth rate of the plant, age of plant, etc. Generally foliar applications of fertilizers should be made every six to eight weeks. Floliar applications should be made as deficiency symptoms first appear although it is best to prevent the appearance of deficiency symptoms as yield and quality are reduced. Establish a spray program based upon sound principles of management and the recommendations of your County Agricultural Agent.