What are the factors affecting the effect of foliar fertilizer?

The effect of the use of foliar fertilizer is affected by many factors. To improve the use of foliar fertilizer, it is necessary to understand the factors affecting foliar fertilizer.


Leaf wax and corneum thickness, leaf activity, etc., can affect the absorption of foliar fertilizer. The new leaf with a thin cuticle and strong leaf activity has a good absorption effect on the leaf surface fertilizer. Urea has a softening effect on the stratum corneum of epidermis, which can accelerate the infiltration of other nutrients, so urea becomes an important component of foliar fertilizer. Neutral soap, silicone additives, etc., can soften the stratum corneum, increase the spreadability of the fertilizer solution, increase the contact area with the blade, and improve the absorption efficiency. Leaf age is generally associated with leaf activity, and new leaves are more nutritious than older leaves.

2. The nutritional status of the plant itself

Plants lacking nutrients have a strong ability to absorb nutrients. Normal plant growth, adequate supply of nutrients, and less absorption after spraying foliar fertilizer;

3. Environmental conditions

Light, humidity, temperature, etc. have a great influence on the absorption of foliar fertilizers. The light is weak and the air humidity is high, which is beneficial to the absorption of foliar fertilizer. Foliar concentration is too high, water evaporates too quickly, and sometimes it burns the leaves, causing damage. The general cloudy or afternoon 4:00-5:00, the temperature of 20-25 degrees Celsius, foliar spray better.

4. Spray solution properties

Solution concentration, pH, solution surface tension, and nutrient mobility also affect the absorption of foliar fertilizers. Different foliar fertilizers have different concentrations, and the spray solution concentration should be adjusted as required. When a cation is supplied, the solution is slightly alkaline; when an anion is supplied, the solution is slightly acidic, which is favorable for the absorption of nutrients. Adding 2% neutral detergent powder to the spray solution can reduce the surface tension of the solution, increase the contact area between the solution and the leaves, and quickly absorb nutrients. The absorption of leaves and the movement of nutrients in the leaves are positively correlated. The nutrients with fast nutrient movement within the leaves also absorb faster. The movement speed of nutrient elements in the leaves is generally: nitrogen> potassium> phosphorus> sulfur> zinc> iron> copper> manganese> molybdenum> boron> calcium. When spraying difficult-to-move elements, it is necessary to increase the number of sprays and pay attention to the spray site. For example, iron, boron, molybdenum, etc. with slower speeds are better for spraying on new leaves.

In addition, the time that the solution wets the leaves also affects the absorption of the leaf surface fertilizer. Generally, the wet time of the blade is within 30 minutes to 1 hour, and the absorption rate is fastest.

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