. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 94 BOTANY matters are taken in far in excess of the immediate needs of the plant. Such minerals are stored in the stem and leaves. Need of Mineral Matter for Growth. — Plants will not grow well without certain of these mineral substances. This can be proved by the growth of seedlings in a so-called nutrient solution. Such a solution contains all the mineral matter that a plant uses for food.^ Mineral Matter necessary for Growth of Young Plants. — Obtain three jars; put distilled water in on
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 94 BOTANY matters are taken in far in excess of the immediate needs of the plant. Such minerals are stored in the stem and leaves. Need of Mineral Matter for Growth. — Plants will not grow well without certain of these mineral substances. This can be proved by the growth of seedlings in a so-called nutrient solution. Such a solution contains all the mineral matter that a plant uses for food.^ Mineral Matter necessary for Growth of Young Plants. — Obtain three jars; put distilled water in one, nutrient solution (without ferric chloride) in another, and nutrient solution plus ferric chloride in the third. Place germinating corn or bean seedlings in the jars so that roots extend down into the liquids. Observe the growth of the three lots of seedhngs. Decide which of the three jars is most favorable to growth. Nitrogen in a Usable Form necessary for Growth of Plants. — We learned that humus is made up of decayed plant and animal bodies. A chemical element needed by the plant to make proto- plasm is nitrogen. This element cannot be taken from either soil water or air in a pure state, as is the case with the other chemical elements used by the plant in the manufacture of protoplasm. Nitrogen is usually obtained from the organic matter in the soil, where it exists with other substances in the form of nitrates. Nitrogen is found in such form in all decaying material; hence the use of fertilizers.^ Relation of Bacteria to Nitrogen. — It has been known for a long time that clover, peas, beans, and other legumes, cause the ground to become more favorable for growth of other plants. The reason for this has been discovered in late 3^ears. On the roots of the ^ A nutrient solution may be prepared as follows: — Distilled water (H2O) Potassium nitrate (KNO3) gram Sodium chloride (NaCl) gram Calcium sulphate (CaS04) gram Magnesium sulphate (M
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