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Crop and variety response to applied phosphate and uptake of phosphorus from soil and fertilizer

Crop and variety response to applied phosphate and uptake of phosphorus from soil and fertilizer

Agron Jour 45(1): 6-11

P32 was used as a tracer in studying the uptake of soil and fertilizer P by varieties of wheat, oats and barley. The fertilizer used was ammonium phosphate (11-48-0) at 50 lbs.per acre. The expts. were at 2 locations: on a soil which was slightly to moderately responsive, and on a highly responsive soil. On the less responsive soil, increased yields were obtained on the phosphated plots with a fairly high utilization (avg. 25%) of the fertilizer phosphate but with a rather marked decrease in utilization of soil P as compared to the uptake on the untreated plots. On the responsive soil a higher uptake (avg. 33%) of fertilizer phosphate occurred for all crops, and uptake of soil P in the case of oats and barley remained about the same on both fertilized and unfertilized plots, although there was a lower uptake of soil P on the fertilized wheat plots. Varietal differences in yield appeared in oats and barley, but it was only in the barleys that varietal differences in response to phosphate fertilizer were obtained. These differences were not accompanied by a significant difference in uptake of soil or fertilizer P. Barley showed a significantly greater ability to utilize the applied phosphate than wheat, but there was no significant difference between wheat and oats, or barley and oats.

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