Excess phosphate and micronutrient deficiency in Macadamia

BASED ON OBSERVATIONS, IT WAS CONCLUDED THAT: 1) PHOSPHATE FERTILIZER RATES SHOULD BE BASED ON GOOD SOIL INFORMATION. 2) THE INITIAL HIGH PHOSPHATE RATES REQUIRED FOR YOUNG TREES GROWING ON NEW LAND (OR LAND WHICH INITIALLY IS VERY PHOSPHATE-DEFICIENT) PROBABLY CAN BE SCALED DOWN IN LATER YEARS. 3) USE BOTH FOLIAR ANALYSES AND SOIL TESTS TO CHECK THE ADEQUACY OF THE FERTILIZER PROGRAM. 4) PUT LITTLE OR NO FAITH IN FOLIAR ANALYSES FOR IRON. 5) IF CHLOROSIS ALREADY HAS DEVELOPED DUE TO EXCESS PHOSPHATE, DRASTICALLY REDUCE OR ELIMINATE PHOSPHATE FROM THE FERTILIZER. 6) CHECK ON THE BALANCE OF SEVERAL MICRONUTRIENTS. SOMETIMES WHAT WAS A BORDERLINE DEFICIENCY OF IRON BECOMES A SERIOUS PROBLEM.