Abstract
The effects of different cropping systems on soil inorganic nitrogen accumulation was analyzed using survey and experiments date.The results showed that the ability to recover nitrogen fertilizer under different cropping systems was as follows: continuous sunflowerwheat-corn rotation(field covered with crops) wheat-corn rotation(without covering)wheat-soybean rotationcontinuous corn.Reasonable rotation(i.e.rotation with N2fixing legumes,rotation with deep-rooted crops) and stubble-mulch,were recommended because they could utilize NO-3-N from the subsoil,prevent losses of nutrients from leaching.The amount of NO-3-N accumulation and NH+4-N accumulation in vegetable field in 0—2 m soil layer was 1935.03 kg/ha and 201.8 kg/ha respectively.The high concentration of residue NO-3-N indicated that the rate of N input should be reduced,and cropping sequence should be adopted to enhance the utilization efficiency of NO-3-N from the soil at depths below the rooting zone.
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Claims 0
Judged adjacent: soil study without a plant endpoint — claims were not extracted. This is a scope decision by the model, not a statement about the paper’s findings.