'Periodica Polytechnica Budapest University of Technology and Economics'
Abstract
The effect of different fertilizers (nitrogen, phosphorus, potassium) and their combinations
on the yield, raw protein content and amino acid composition were studied in field
experiments. The levels of treatment were 200 kg/ha for nitrogen, 500-1000 kg/ha for
phosphorus and potassium. Winter rye, triticale and wheat cultivar were grown in two
subsequent years.
Nitrogen fertilization in all cases increased the yield of grains and the raw protein
content. The increase reached about 50% in average comparing with control samples grown
without adding nitrogen fertilizers. Although there are significant differences between the
different cereals studied, it can be generally stated that the increase in protein content is
connected with a decrease in the essential to non-essential amino acid ratio. The decrease
is higher if only nitrogen fertilizer is used and moderate if a combined treatment with
nitrogen, phosphorus and potassium fertilizer is applied