Foliar sprays dry quickly when applied at high temperatures, reducing absorption of the nutrients in solution.
High light intensities can improve foliar uptake.
High humidity favours nutrient uptake through the leaves in two ways; by decreasing the rate of drying of the applied nutrient solutions, and by causing the cuticle to absorb water from the atmosphere and swell, which results in the formation of more polar pores.
pH of the Spray Solution
The pH of the spray solution can influence solubility, uptake and penetration of the plant nutrients.
Wetting agents improve foliar uptake by enhancing leaf coverage. Surfactants reduce the surface tension of the solution, overcoming cuticular barriers and improving foliar uptake.
Aging leaves develop thick cuticles that hinder foliar uptake.
Young developing leaves have thin cuticles and are therefore more efficient at foliar uptake.
Higher spray volumes result in more uniform coverage and more effective foliar feeding.
Foliar applications should wet the entire canopy, especially the new leaves.
As the concentration of the foliar spray increases, uptake also increases.
Lower spray water volumes generally result in less uniform spray coverage and less effective foliar feeding.
Ambient and spray water temperatures can interact with these factors.
Why Foliar Feed? Foliar feeding is a powerful way to provide crops with essential micronutrients throughout the growing season. When done properly, foliar fertilization can be more target oriented compared to soil-applied methods, since nutrients can be delivered directly to plant tissue during critical stages of plant growth. Although it doesn’t replace soil nutrition, foliar…
Short Answer: YES By supplying proper foliar nutrients, such as those in the TruPhos™ and Plant Activator™ Lines. The Bad: Lack of Oxygen: Wet soil conditions reduce the amount of oxygen in the soils, which leads to anoxic conditions. In these conditions, roots cannot breath and root death occurs….
Uptake of foliar-applied nutrients. The cuticle provides plants a layer of protection surrounding their stems, leaves, fruits and flowers, which can be compared, in many ways, to our skin. The function of this cuticle is to control the flow of gases in and out of the plant and to maintain optimal levels of transpiration (the…
Give crops the strength to cope with dry conditions. The Problem: When it’s hot and it hasn’t rained for weeks, how do your crops cope? During times of low water supply, the stomata on the leaves close to prevent water loss. This helps to conserve water in the leaves but it also disrupts the water…
Plants require 14 essential nutrients for growth and reproduction. Without a sufficient amount of each of these nutrients a plant’s growth will be negatively affected. Nutrients are considered essential to plants if they meet one of the following criteria: In its absence the plant is unable to complete a normal life cycle; or That the…
Many foliar fertilizers on the market are inefficient at being taken up by the leaves for a number of reasons. Foliar fertilizers must be soluble in order to readily move through the cuticle. Additionally, many fertilizers on the market (such as humates and lignosulfonates) are restricted from uptake via the polar pores due to their…