Water Soluble Zinc Sulphate for Foliar Spray & Drip Fertigation: Dilution Ratios, pH Buffering & Nozzle Compatibility

Modern precision agriculture increasingly relies on pressurized micro-irrigation and mechanized foliar sprayers. Using water soluble zinc sulphate for foliar spray and drip fertigation provides rapid micronutrient uptake, eliminating the 60-80% lock-up typical of direct soil broadcasting in calcareous soils.

1. Water Solubility Curves & Solution Clarity

Not all zinc sulphate salts dissolve equally in field water. Auron Zinc Sulphate Monohydrate 33% (Soluble Powder) is engineered for 100% instantaneous solubility:

• •Solubility Rate: Dissolves completely within 45 seconds at ambient water temperatures (15°C–35°C).

• •Turbidity & Sedimentation: Delivers crystal-clear solutions with zero sand, grit, or unreacted zinc oxide particles, ensuring zero emitter clogging in 16mm drip lines with 120-mesh disc filters.

2. Best Practice Dilution Ratios for Foliar Spraying

• •Standard Field Crops (Cotton, Paddy, Maize): 3 to 4 grams per liter of water (0.3% to 0.4% solution). Deliver 150–200 liters of spray volume per acre.

• •Fruit Orchards (Mango, Citrus, Apple, Guava): 2.5 to 3 grams per liter combined with a non-ionic spreader during new leaf flushes.

• •pH Buffering: Ensure water pH is between 5.5 and 6.5. If hard water (pH > 7.8) is used, add 1 gram of citric acid per 10 liters to prevent zinc hydroxide precipitation.

3. Drip Fertigation Injection Schedule

Inject through Venturi or fertilizer injection pumps during the middle 50% of the irrigation cycle, followed by 15 minutes of clean water flushing to clear drip laterals.