Effects of Different Fertilization Strategies on Soil Nutrients, Runoff Losses, Crop Nutrient and Yield in Rice-Wheat Rotation

This study examined the effects of different fertilization treatments on soil nutrient, runoff nutrient loss, plant nutrient and yield in a rice-wheat rotation system.The treatments included were non-N-fertilised control (CK), conventional N management (CON), optimised N management (OPT), 30% reduced N (OPT-N), 50% reduced P (OPT-P) and straw with chemical fertilizer (OPT-NP+S).Results showed that the soil organic matter improved after fertilisation.The soil nitrate nitrogen (N) content for wheat and the available phosphorus (AP) content in rice did not differ between treatments.Conversely, the other nutrients showed significant differences.Only the total phosphorus content of wheat significantly differed among the treatments, and the maximum plant yield was 5154.87 kg/ha under the OPT-P.The mean total potassium content of rice plant did not significantly differ and the maximum plant yield was 9532.68 kg/ha under the OPT.Corresponding results can provide a reference for variable fertilization in rice-wheat rotation.