In July 2009, I fertilized 158 citrus trees of 4 years old. I used one part of Urea, one part of ZA, and one part of Phonska. The dose was 2 kg per plant. Prior to fertilizing, I made the plant water stress for 1 month expecting new buds would emerge and then turn into flowers. However, there were only 5—10% of buds that became flowers. What I would like to ask: