How to absorb water roots and mineral salts from the soil
Starting from the tip, the root consists of four areas: division zone, stretch zone (zones) growth), the suction zone and the holding area. The suction zone at the root is about 2-3 cm long. From the cells of the outer cover of the root depart root hairs — long outgrowths that increase the total suction surface of the root many times.
The root can absorb mineral salts only in dissolved form. The mucus secreted by the root hairs dissolves them and makes them available for suction.
Water with dissolved minerals rises up the conductive tissues of the plant to the stem and leaves. This is how upstream current is performed. Organic substances formed in the leaves during the process of photosynthesis arrive at the roots and other organs of the plant by downcurrent.
The ascending current goes along tracheids and vessels of wood, descending through the sithoid tubes of the lub. Wood and lube are types of conductive fabric.
Features of root nutrition of plants
Root nutrition provides input to the plant body of water and mineral salts. The plant extracts from the soil potassium salts, phosphorus, calcium, magnesium, nitrogen compounds, sulfur and other elements. The root hairs of the root system work as small pumps.
The plant’s need for minerals depends on its species, age, intensity of growth and stages of development, soil properties, time of day and nature of weather conditions. Most plants need nitrogen, potassium, phosphorus, magnesium, sulphur, but beets and potatoes, for example, require more potassium and barley and wheat nitrogen.
Lack of nitrogen inhibits the growth of the plant and promotes the formation of small leaves. When potassium is scarce, cell division and stretching processes are slowed, which can cause root tip death. Phosphorus is important for metabolism, and magnesium is important for the formation of chloroplasts and chlorophyll. Sulphur deficiency reduces photosynthesis intensity.
In natural conditions, mineral substances absorbed by plants are partially returned to the soil when leaves, twigs, needles, flowers, $ die-off of root hairs. In agricultural work, this does not happen because the harvest is seized by man. For this reason, it is important to use fertilizers to prevent soil depletion and maintain its high yield.