Best practices for silicic acid foliar sprays
Without proper usage, foliar sprays can be wasted or even cause problems such as leaf burn and mold.
The following guidelines will help prevent the above mentioned problems and show the best guidelines for using foliar sprays.
- The best time to spray is usually early morning or evening hours.
In the early morning, humidity is also relatively high, temperature is relatively low and there is less light. Under these conditions the spray remains wet for longer period of time so that maximum absorption can occur.
In hot, dry conditions, the spray can dry too quickly and cause leaf burn and staining.
- The spray device should be fitted with nozzles that produce a fine mist. So the droplet should be as fine as possible. This helps maximize surface coverage, especially on the underside of leaves where the majority of stomata are located.
- Spray when wind is minimal. This is especially important with finely atomized sprays because they drift readily.
- Only lightly spray the leaves with a thin film of moisture. There should be little or no run-off.
- Use clean, low salinity and soft water. If necessary, adjust the pH to 5,5 – 7.
- Don’t spray when it is raining. If rainfall occurs within 1 hour of spraying, re-spray within the next 1-2 days.
- The silicic acid / micro-nutrient sprays (Rexago, REX Green, etc.) can be applied together with most pesticides.