... organization, the utilization ratio of boron is 70-80%, the symptoms of lack of boron will be change quickly ... pesticide, and is also effect to prevention of powdery mildew,-----,it can be used to mix ... organization, the utilization ratio of boron is 70-80%, the symptoms of lack of boron will be change quickly ... pesticide, and is also effect to prevention of powdery mildew,-----,it can be used to mix ...