Usage： 1.Spray on leaves: Iron and manganese are diluted by 1500-2000 times, zinc and magnesium by 1000- 1500 times, copper by 2000-3000 times and titanium by 2500-3500 times, and sprayed continuously for 2-3 times with an interval of 7- 10 days each time. 2.Drip irrigation/irrigation：500- 1000 grams/acre(titanium is 50- 100 grams/acre, copper is 200-300 grams/acre)