Abstract
The long-term effect of N and P fertilisation on the grain yield, yield components and quality parameters of winter wheat was studied for different sites in the National Long-term Fertilisation Trials in Hungary. This network of small-plot fertilisation experiments has been maintained since 1967 in nine different agro-ecological regions of the country. Increasing P and N doses had a considerable effect on the grain yield, yield components and quality parameters of winter wheat according to the results evaluated in the first 20-year average of the experiments. However, these effects differed depending on the agro-ecological conditions of the sites. Yield increases could be detected at lower fertiliser doses, and improvement in quality parameters at higher rates.
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