How is the root uptake of water and mineral salts from the soil
Starting from the tip of the root is divided into four sections: the zone division, elongation zone (growth areas), zones and zones of absorption.Suction zone at the root has a length of about 2-3 cm. From the cells of the outer root sheet depart root hairs - long process, many times increases the overall surface of the suction root. root can absorb the mineral salts only in dissolved form.The mucus released by root hairs, dissolves them and makes available for absorption.
water with dissolved minerals up the conductive tissues of the plant to the stems and leaves.Since the current is carried upward.Organic substances produced in the leaves during photosynthesis comes to
roots and other plant organs downward shock. Ascending current is on the tracheids and vessels of wood, top-down - on the phloem sieve tubes.Wood and cork - types of conductive fabric.
Features root plant nutrition
root nutrition provides admission to the plant body of water and mineral salts.The plant extracts from soil potassium, phosphorus, calcium, magnesium, nitrogen compounds, sulfur and other elements.Root hairs root system while working as small pumps.
needs of plants in the minerals depends on the species, age, rate of growth and development stages, soil properties, the time of day and the nature of the weather conditions.Most plants need nitrogen, potassium, phosphorus, magnesium, sulfur, but the beets and potatoes, for example, require large amounts of potassium, and barley and wheat - nitrogen.
Lack of nitrogen slows plant growth and promotes the formation of small leaves.With a shortage of potassium retard cell division and tension that can cause the death of the root tip.Phosphorus is important for metabolism, and magnesium - for the formation of chlorophyll and chloroplasts.Deficiency of sulfur reduces the rate of photosynthesis.
In nature, minerals absorbed by plants, partially recycled back to the soil at the falling of leaves, twigs, pine needles, flowers, withering away of root hairs.In the conduct of agricultural operations that does not happen, because the harvest is taken by man.For this reason, it is important to use fertilizers in order to prevent the depletion of the soil and maintain its high yields.