The rice production practices of high yield and high nitrogen use efficiency in Jiangsu, China.

And the NH 4 + -N and NO 3 − -N concentrations under the OPT treatment were higher than under the FFP treatment in the top 20 cm of the soil layer, indicating that soil NH 4 + -N and NO 3 − -N were gradually leached down into deeper soil layers due to precipitation and irrigation. We also simultaneously analyzed the results from the large demonstration area under field conditions from the Soil Testing and Formulated Fertilization database for Jiangsu, and the results were consistent with the location field experiment, which showed a trend in rice yield of OPT > FFP > CK.

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Simultaneously, the total N showed a decreasing trend from the south to the north of Jiangsu.

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