... soluble and nontoxic to plants when applied as directed. For best results, apply Boron soluble powder according to recommendations based on ... , tobaccos, cotton, teas, oil-bearing crops, Chinese medicinal plants, flowers, lawn and grain crops, etc; it can also be used in ... .Usage: 4.1 Proposed dosage Style of fertilization Dosage Foliar fertilizer and drip irrigation 5~8KG/acre, 600~800 times dilution ...