INORGANIC PHOSPHATE IN GREEN PLANT TISSUE AS A MEASURE OF PHOSPHATE AVAILABILITY

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Abstract
In the vegetative stages, oats limited in growth by insufficient phosphate were exceedingly low in inorganic phosphate in all parts of the plant. Where not limited by phosphate much higher quantities were found in the green plant, and in Lisbon lemon cuttings grown in culture solutions. Applications of phosphate fertilizer greatly increased the absorption of phosphate by oat plants; all parts of the plant showed this effect in the vegetative stages, the embryonic, conductive, and storage tissues being most markedly affected. N deficiencies caused inorganic phosphate to accumulate within the oat plant, even in soils which were deficient in phosphate. Marked accumulations of inorganic phosphate have been found in the leaves and stems of citrus branches affected with the physiological disease known as "mottle leaf.".