The Use of Nitrogen Fertilisers in Intensive Wheat-growing in France’
For many years, rates of application of nitrogen (N) fertiliser were decided pragmatically by modifying standard recommendations for each region. However, for the past ten years I.N.R.A. and I.T.C.F. have proposed a system designed to calculate the crop’s nitrogen requirement to suit individual field conditions more precisely. The system is based on estimation of nitrogen balance in the soil and adjustment of N fertiliser rate accordingly. Despite difficulties encountered in application of the method, its use is increasing rapidly. While the system can be applied to any cropping system it is particularly well suited to intensive cultivation.
J C Remy, INRA, France.
Ph Viaux, ITCF, France.
26 Pages, 12 Figures, 8 tables, 22 References.