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The availability of the nitrogen in the crop residues of winter wheat to subsequent crops

  • P. B. S. Hart (a1), D. S. Powlson (a1), P. R. Poulton (a1), A. E. Johnston (a1) and D. S. Jenkinson (a1)...

Summary

Three field experiments in Eastern England, in which 15N-labelled fertilizer had been applied to winter wheat, were used to measure the persistence of the labelled N remaining in soil and stubble at harvest and the availability of this N to up to four subsequent wheat crops. A portion of the labelled fertilizer N quickly became stabilized in the soil, with only small and ever-decreasing amounts recovered by subsequent crops. Combining all sites, all years and all applications of fertilizer, 6·6±1·92 (S.D.) % of the labelled fertilizer remaining in soil (0–70 cm) plus stubble in the year of application was taken up by the next wheat crop, i.e. by the first ‘residual year’ crop. A further 3·5±0·39% was taken up in the second residual year, 2·2±0·43% in the third and 2·2% in the fourth. Loss of residual labelled N was more rapid from a sandy soil than from two heavier-textured soils, particularly in the first residual year. After four residual crops on one of the heavier soils (at Rothamsted), 16% of the labelled N remaining in soil (0–70 cm) and stubble in the year of application had been taken up by the crops, c. 29% had been lost from the soil/crop system and 55% remained in the soil.

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The availability of the nitrogen in the crop residues of winter wheat to subsequent crops

  • P. B. S. Hart (a1), D. S. Powlson (a1), P. R. Poulton (a1), A. E. Johnston (a1) and D. S. Jenkinson (a1)...

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