The nutrition of the radish

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Abstract
Sand‐culture experiments with the radish demonstrated that the optimum concentrations of nitrogen for root development were the highest employed, 32.96 and 65.92 p.p.m. Deficiency of nitrogen led to poor growth and to a characteristic outlining of the cotyledons in red, with red petioles. As with the carrot and turnip, a low concentration of available phosphorus, here 2.05‐4.09 p.p.m., gave the best root growth; and a marketable radish was obtained with so little as 0.10 p.p.m., suggesting that the relatively large radish seed contains a considerable quantity of phosphorus. The highest concentration of potassium used, 22.44 p.p.m., yielded the largest roots, and a diminution in this amount led to loss of yield and eventually to serious scorch of the foliage. There is possibly some boron in the radish seed; for though absence of this from an otherwise satisfactory solution resulted in diminished yields, the foliage was normal in appearance, and the radish of eatable size; the radishes apparently lacked ability to swell.

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