Updated: Sep 6, 2018
A technique of feeding plants by applying liquid fertilizer directly to their leaves
The most effective way to apply micronutrients or trace elements and to supplement macronutrients at key timings
Not a replacement for a sound soil fertility program
Purpose of foliar feeding.
To improve plant health and development when nutrient uptake from the root system is suppressed
To alleviate physiological stress after or before exposure of the plant to unfavorable weather events.
To supplement overall nutritional status of plants grown under intensive conditions or low soil fertility conditions.
To supplement nutrient supplies during critical peak demand period
Considerations for foliar feeding.
Do not attempt to completely replace a properly constructed soil fertilizer program with foliar feeds. This is because a plant cannot absorb sufficient quantities of most nutrients via the foliage to satisfy its full requirements for those nutrients.
Avoid applying foliar feeds during the warmest period of the day, during hot weather conditions, or to wilted plants.
Do not apply foliar feeds with lime sulfur, Bordeaux mixture or other potentially damaging substances.
Do not apply foliar feeds with certain stickers.