The efficiency of nutrient uptake is considered to be 8-9 folds higher when nutrients are applied to the leaves, when compared with nutrients applied to soil.
Author: Mr. Guy Sela, agronomist, expert in plant nutrition and irrigation.
In addition, pH affects foliar absorption of nutrients in three other ways:
However, many open questions and uncertainty still surround this practice.
Turning your field data into informed decisions is the key to successul crop, and it now easier than ever before
Many believe that foliar feeding is favorable over soil application and it is associated with higher yields, and better fruit quality.
Limited dosage – Nutrients applied in foliar application cannot meet the entire nutrient requirements of the crop.
In specific growth stages – Plants require different amounts of nutrients in different growth stages. It is sometimes difficult to control the nutrient balance in soil. Foliar applications of essential nutrients during key stages can improve yield and quality.
Under certain conditions, foliar feeding has an advantage over soil applications.
11 facts about foliar-sprays you must know before your next foliar application.
Do Use Foliar Absorption to Your Advantage
Cover the plant’s leaves and stem with a light spray. Remember, less is always more as your plants need to absorb all this liquid before the lights come back on. If the leaves are dripping wet, you have used too much. It may take you a few attempts to get it right.
Within the hydroponics industry, there are two main types of feeding regimes: organic and non-organic nutrients. Both these feeding systems pass nutrients into a plant’s vascular system via the roots. There is, however, another way into the plants vascular system. A secret way in.
Do Use a Foliar Spray at Lights Out
Do Use Proper Technique When Foliar Spraying
This secret way is foliar feeding. A commonly overlooked method used in vegetative and flowering stages, foliar feeding allows for nutrients to pass into the vascular system through direct leaf and stem absorption.
Spraying your plant at this point also means that it has the maximum amount of time to absorb the nutrients. If you were to spray your plants too close to lights on, the plant could still be wet when the lights come on. This would have the same negative effects on the plant as if the foliar spray was applied when the lights were on as discussed previously.
Foliar feeding increases the humidity within the growing environment. While this is great while your plant is in its vegetative stage, it can be a problem when your plant is in flower. During the flowering stage, your humidity is already high. Environment is such an important factor in modern hydroponics that I personally wouldn’t do anything to mess it up.
Foliar feeding can be a powerful ally to supercharging your plants ready for bumper yields. However, there is a catch. If it is not carried out correctly, it can have such a detrimental effect on your plants that they could be dead within 24 hours.
A commonly overlooked method used in vegetative and flowering stages is foliar feeding, which is the act of spraying nutrients directly onto leaves.