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Mineral salts. Principally nitrates and phosphates.
Plants absorb mineral salts from soils and waters.
The function of the root hair cell in plant is to absorb water and mineral salts.
The underground stems do not absorb water and mineral salts for the plant, rather these store the prepared food material in them to overcome adverse environmental conditions.
Many plants require roots. Basically, the roots are required to absorb water & mineral salts. The roots, being long & narrow will absorb water and mineral salts as they grow between the soil particles rich in these raw materials. This is why, the roots of a balsam plant are important.
Plants absorb mineral nutrients by way of ions in the soil. This is basically the case with how all plants get their nutrients besides sunlight. The process takes place at the atomic level.
Mineral salts are not foods.
water and mineral salts are obtained in the soil and are absorb by the root hair cell
Some expensive or rare mineral salts must be recycled.
Large Intestine
The cause is the irrational use of fertilizers.
Bones are hard and contain mineral salts.