Fodder value of spring triticale in correlation with nitrogen fertilization level
Pilejczyk, D.E-mail:[email protected] | Sienkiewicz, S. | Wojnowska, T. | Zarczynski, P.(University of Warmia and Mazury, Olsztyn (Poland). Dept. of Agricultural Chemistry and Environmental Protection)
A three-year (1993-95) field experiment was conducted in North-Eastern Poland involving cv. Maja spring triticale. The effect of different levels of nitrogen fertilization (60, 90 and 120 kg/ha) on the protein yield, amino acid composition, nutritive value (Essential Amino Acid Index, Chemical Score by Oser), content of organic components and metabolic energy yield was analysed. Higher nitrogen fertilization significantly increased the total and true protein yield. The nutritive value of protein measured by the value of Oscar EAA index depended on the rate of nitrogen. The highest quality protein (EAAI=63.26 percent) was obtained when a single dose of 90 kg N/ha was applied prior to sowing. For any variant, an additional application of 30 kg nitrogen depressed the value of EAAI. The first restrictive of nutritive value of protein amino acid was methionine, followed by isoleucine and lysine. Nitrogen doses applied in the trials did not have any significant effect on the total of exogenous amino acids in protein. The highest nitrogen rate slightly depressed the concentration of crude fat and increased the content of crude fibre, although it did not modify significantly the concentration of crude ash of nitrogen free extracts in grain. Taking into account the use of triticale grain for fodder production, the optimum nitrogen fertilization rate seems to be 90 kg N/ha. Although higher doses of nitrogen increase yields of protein, its nutritive value suffers
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