Kaiser, E. A., Eiland, F., Germon, J. C., Gispert, M. A., Heinemeyer, O., Henault, C., Lind, A. M., Maag, M., Saguer, E., Van Cleemput, O., Vermoesen, A. and Webster, C. P. 1996. What predicts nitrous oxide emissions and denitrification N-loss from European soils? Zeitschrift fur Pflanzenernahrung und Bodenkunde. 159, pp. 541-547.
Bell, C. I., Jones, J., Franklin, J., Milford, G. F. J. and Leigh, R. A. 1995. Sulphate supply and its effects on sap quality during growth in sugar beet storage roots. Zeitschrift fur Pflanzenernahrung und Bodenkunde. 158 (1), pp. 93-95. https://doi.org/10.1002/jpln.19951580120
Kuhlmann, H., Barraclough, P. B. and Weir, A. H. 1989. Utilization of mineral nitrogen in the subsoil by winter wheat. Zeitschrift fur Pflanzenernahrung und Bodenkunde. 152 (3), pp. 291-295. https://doi.org/10.1002/jpln.19891520305
Kuhlmann, H. and Barraclough, P. B. 1987. Comparison between the seminal and nodal root systems of winter wheat in their activity for N and K uptake. Zeitschrift fur Pflanzenernahrung und Bodenkunde. 150 (1), pp. 24-30. https://doi.org/10.1002/jpln.19871500106