Trace Elements Essential for Plants

What are "trace" elements? Elements (present in most soils) which are needed in very small amounts, for plant nutrition. Some of these are present in such small quantities that they are known as trace elements.

What are the principal trace elements? Boron, chlorine, copper, iron, manganese, zinc, and molybdenum.

Is boron a necessary ingredient in all types of soils? A small amount of boron is essential for plant growth, and to prevent various physiological disorders. It is present in most soils in sufficient quantities. It is most apt to be deficient in soils low in organic matter. If overused, it can be toxic to plants.

How should boron be used in the soil? Boron is common applied in the form of borax, at the rate of 10 to 15 lbs. per acre. This is only 4 to 5 ounces per 1,000 sq. ft.

How can I be sure that my soil will have enough sodium for good growth of beets? Use 1/2 to 1 lb. nitrate of soda, or 1/2 lb. table salt, per 100 sq. ft. Most mixed fertilizers contain enough sodium for beets, however.

My garden soil turns a red color on top when dry; why? The red color probably is due to a surface growth of red algae. These minute plants do no harm and are often found on moist soils. They go unnoticed until the soil surface dries and their red color is then apparent by contrast.

Are iron or steel filings beneficial in darkening colors of perennials, especially roses and lilacs? No. Iron sulfate (copperas) is beneficial where iron in soil is low; chiefly useful in greening foliage, not darkening flower color.