Joint International Conference on Long-term Experiments ...

The comparison of the nutrient content of the crops shows that the sulphur, phosphorus
and magnesium content is similar, however, several nutrients show significant
deviations. The boron and nickel content of pea, being 6-8 times higher than that of
wheat is noticeable. At the same time, the manganese content of wheat is 5 times higher
than that of pea or corn.
To determine the protein content of the grain, we used the nitrogen content. The
sulphur content of the grain is determined by amount of the amino acids containing
sulphur (cystein, cystine). The amount and quality of protein in the grain significantly
influences the quality of the yield and the nutritional and feeding value.
It is noticeable that only at wheat was the correlation between the nitrogen and sulphur
content close, as shown in Figure 4.
Figure 4: Correlation of the nitrogen and sulphur content of the crops
The amino acids containing sulphur have an important role in the build-up of the protein
structure, therefore, the analysis of the nitrogen-phosphorus ratio as regards their buildin
the grain is of great importance in our further research. The samples from the NLTFT
(National Long-Term Field Trials) are an important basis for this work.
CONCLUSIONS
Summarizing, we can conclude that the results of the analysis of the samples from the
NLTFT (National Long-Term Field Trials) helped us to identify several new relations
and supports the scientific work in the fields of plant nutrition, sustainable development,
maintenance of soil fertility and the production of healthy raw materials. Consequently,
long term field trials are essential in quality assurance, since it takes long years to
identify the optimal plants and nutrient doses in a given crop rotation and their
concentration in the grain, in order to obtain the maximum quality for a given
production purpose.
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