Potassium is a necessary element for plants. It is mainly found in young growing organs, cell sap of plants and promotes the rapid accumulation of carbohydrates. This substance plays an important role in the absorption of water, the transformation of energy. When there is a lack of it brown spots appear (the central part of the leaf and veins remain green) on the edges of the leaves. A sharp lack of potassium causes the death of old leaves, but new ones persist. In addition, the immunity of plants is weakened, they are more often subjected to various, especially fungal, diseases, their resistance to unfavorable environmental factors is reduced. Lack of potassium leads to deformation of the stem, violation of the blooming period and fruiting, weakening of the immune system. The last factor leads to the death of the plant.
Depleted peat bogs are characterized by potassium deficiency. It also appears on all soils of the Non-Black Earth Region, especially on sand and sandy loam, with an unbalanced application of nitrogen or phosphorus-nitrogen fertilizers. May occur after heavy rains as a result of leaching potassium from the leaves. In rainy years it is observed on tomatoes, potatoes and cucumbers. Potassium is not used on alkaline and saline soils, since it degrades their properties.
Many potash fertilizers are natural potassium salts used in agriculture in the milled form.
A significant amount of chlorine in many such fertilizers adversely affects the growth and development of plants, and the sodium content (in potassium salt and sylvite) worsens the physicochemical properties of many soils, especially black humus soils, chestnut and alkaline soil.
Potassium is easily soluble in water, and during the application the soil it is absorbed by colloids, so it is inactive, but from light soils it is washed easily.