Fertilizer when spraying through the mouth?

It's not surprising that most of them are confused and understood correctly, academically! Because in the past or in basic biology texts, we were often taught that "Stomata has the main function of spitting water and exchanging gas, not for fertilizer." Most of the fertilizers enter the surface of the leaf.

But when it comes to "Foliar Feeding," plant scientists have researched and expanded the truth, which is the truth:

1. Is it true that fertilizer enters the "leaf skin cells," not the "hole of the mouth"?

Really! I understand the most correct.

When we say that fertilizer enters the mouth, people tend to imagine that the fertilizer molecule runs straight through the hole of the mouth, like a person walking in the door of a house...But in reality, it doesn't work that way.

Why not enter the hole directly?: Because in the hole of the stomata there is a pressure of water vapor evaporating the garden all the time (dehydration), and importantly, the inner wall of the hole of the stomata has a thick layer of fat coating to prevent external water from flowing back into the plant. Aqueous fertilizer cannot flow porridge into the hole directly.

2. Why do agricultural scholars talk about EDTA or general fertilizers like to say, "Have to wait for the mouth to open"?

This is a confusing point. The word "entering the stomata" in chemical fertilizer means "seepage into the cells and the cells around the stomata."

The weakness around the mouth of the leaf: There is a thick layer of fat on the surface of the plant that blocks the fertilizer, but the "control cells" (two pea cells that open and close the mouth of the leaf) are the thinnest layer of fat on the leaf.

When the stomata are open (photosynthetic): the control cells grow, expand, and pull the skin around them to expand, causing the fat layer to form a "small gap" (Ectodesmata).

EDTA shortcuts: Fertilizers with medium molecules like EDTA or common scale fertilizer rely on this rhythm to penetrate the walls of the control cells and the cells around the stomata, not directly into the dehydration hole.

So if the plant closes the mouth of the leaf, the control cell will shrink, the fat layer will come back and close, and the EDTA fertilizer will be exhausted.

3. Which way does the "glycine chelate" group enter? Why not reconcile this process?

The glycine chelate group fertilizer does not need to go out or wait for the control cells around the stomata.

Cuticular Penetration: The plant leaves have a layer of lipids (Cuticle) and leaf skin cells (Epidermis) covered throughout the leaf face and the leaf back.

Glycine chelates have a very small molecule size that can "penetrate the fat layer and any leaf cell wall" throughout the plant leaf without the slightest stretch of control cells around the mouth.

📊 summary to disappear. Confused.

Original Idea / Common Texts: The stomata are for dehydration. Fertilizer must enter through the leaf cells.

EDTA Fertilizer / Flake Fertilizer Facts: Fertilizer is true through leaf cells, but it is "a specific leaf cell around the stomata," which allows fertilizer to penetrate cells well only when the stomata are stretched open (when photosynthesizing).

The glycine chelate fact: The molecule is too small to seep into "leaf skin cells at any point in the leaf" without going to the cells around the mouth.