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By applying labeled urea into a loamy meadow brown soil, a pot experiment with spring wheat as test crop was carried out. The results showed that at the end of this experiment, the plant recovery, the soil recovery and the total loss of applied urea 15N was 17.7–23.7%, 43.7–56.3% and 20.0–36.8%, respectively. 15N recovery by wheat grain in any treatment varied within a range of 9.0–14.7% of the applied...
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