1. The Soil at Rothamsted;Avery,1995
2. Barraclough, P.B., 1997. N requirement of winter wheat and diagnosis of deficiency. In: Gooding, M.J., Shewry, P.R., Optimising cereal inputs: its scientific basis, Part I: genetics and nutrition. Aspects of Applied Biology No. 50. The Association of Applied Biologists, Warwick, UK, pp. 117–124
3. Effect of water stress on chlorophyll meter readings in winter wheat;Barraclough,2001
4. Plant analysis using near infrared reflectance spectroscopy: the potential and the limitations;Batten;Australian Journal of Experimental Agriculture,1998
5. Relationship between N concentration of grain and grain yield in recent winter wheat experiments in England and Belgium, some with large yields;Benzian;Journal of the Science of Food and Agriculture,1983