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Efficiency of Rape, Oats, Soybeans, and Flax in Absorbing Soil and Fertilizer Phosphorus at Seven Stages of Growth¹

A greenhouse experiment was conducted in an attempt to determine the phosphorus requirements of rape, oats, soybeans, and flax at various stages of growth. Radioactive phosphorus was used in order to differentiate between the amount of phosphorus derived from the fertilizer and from the calcareous soil used. Phosphate fertilizer was applied as a band about 1.3 cm below the seeds at the time of planting.

"A" values differed amongst these crops and at different stages of growth for the same crop. The "A" values decreased in the order soybeans, flax, oats, and rape. Soybeans were much more efficient than rape, oats, and flax in extracting soil phosphorus. For most of the growth cycle rape and flax were similar in absorbing phosphorus from the soil and in this respect oats were less efficient than these two crops except for the last two stages. It would appear that the differences amongst the "A" values of rape, oats, and flax are largely due to differences in their abilities to extract fertilizer phosphorus. The "A" values of soybeans were very high, which would seem to be largely due to their greater efficiency in absorbing soil phosphorus.

Key Words: "A" values, P uptake

² Research Assistant and Associate Professor. Present address of the senior author is: Forest Research Laboratory, Canada Department of Forestry, Winnipeg, Manitoba.

Received for publication September 20, 1967.