Nitrogen leaching and groundwater N contamination risk in saffron/wheat intercropping under different irrigation and soil fertilizers regimes.

Overall, the leachate nitrate concentration of manure decreased over the whole growing season due to the leaching process and crop nitrogen use, while for urea treatments, after a decreasing trend, it rose and peaked at 141 days after first irrigation due to the application of the second split of urea fertilizer just before this date (the first half of crop required nitrogen was applied just before the first irrigation).

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