Studies on the rule of winter wheat absorption and utilization of phosphorus fertilizer at spring regreening stage using phosphorus-32 tracer

Under rich and poor phosphorus soil conditions, the rule of winter wheat absorption and utilization of phosphorus fertilizer at spring regreening stage was studied by means of phosphorus-32 tracing technique.The results were that: On poor phosphorus soil, 82.78% of phosphorus in wheat plants were derived from fertilizer phosphorus; On rich phosphorus soil, 70.54% of phosphorus in wheat plants were derived from soil phosphorus.During the growing season, the utilization percentage of fertilizer phosphorus fertilizeed at spring regreening stage were 23.28% on poor and 13.40% on rich phosphorus soil, respectively.