Abstract
Although small amounts of boron are injurious to citrus species,2 the presence of still smaller amounts may be harmless and even essential for their healthy growth. While boron has been shown by many investigators to be an essential constituent of a rather large and increasing number of plants, it has not previously been shown to be so for citrus. For the past several years the writer has been employing boron as one of the elements of which traces have been added to the culture solution for the successful growth of citrus plants in water and sand cultures. The culture solution was made up from the following salts: sodium chloride, magnesium sulphate, potassium nitrate, calcium nitrate, potassium acid phosphate, and ferric tartrate. The composition of the culture solution expressed as parts per million was as follows: NA K CA MG FE NO, CL SO4 PO, TOTAL
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