Joint International Conference on Long-term Experiments ...

Trp (fehérje %-a)
1,2
1,0
0,8
0,6
0,4
0,2
0,0
Mosonmagyaróvár
Keszthely
Putnok
Iregszemcse
1. kezelés
20. kezelés
SzD 5%
SD5% between treatments MO: 0,310** SD5% between treatments KE: 0,186*
SD5% between treatments PU: 0,198** SD5% between treatments IR: 0,166**
Figure 4 The effect of fertilization on the tryptophan content of peas at different
research sites
NPK fertilization significantly decreased the tryptophan content of peas at the four
examined research sites. These results verify the need for testing the relationship between
phosphorus and zinc in new varieties/hybrids, on the one hand by analysing plant samples
from the early stage of the growing year, on the other hand by analysing the peas, thus we
can obtain information on the trypthophan content as well.
Our earlier results showed that increasing rates of NPK fertilizers decresed the
tryptophan content, as the P-Zn ion antagonism decreased the intake of Zn.
CONCLUSIONS
1. It was verified with experiments that the determination of tryptohan can be reliable
performed by alkaline hydrolysis.
2. Data from literature show that the tryptophan content of peas can be reliably
performed using the presented method.
3. Increasing phosphorus rates decreased the zinc intake due to the P-Zn antagonism
and led to decreased tryptophan content.
4. Our data was included in the database, and the introduced method can be applied to
analyse samples from field trials examining varieties and fertilization of leguminous
crops as well.
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