Yield and malting characteristics of winter barley (Hordeum vulgare L.) depending on agrotechnical arrangements and mineral nitrogen rates

Dependence of yield and malting characteristics of winter barley cv. Rex on increased rates of mineral nitrogen in a long term experiment within two different agrotechnical arrangements (management of cattle raising farms with animal manure MM: management with straw ploughing under and green manure - SM) was examined. The grain yield was increasing with increased rates of mineral nitrogen, the relationship between grain yield and yield of grain bigger than 2.5 mm was linear in both systems of management in both years. In 1999 the yield of grain bigger than 2.5 mm was increasing significantly with increased amounts of mineral nitrogen in MM and SM, in 1998 there were no significant differences between combinations of straw and manure with mineral nitrogen. Bigger quantity of mineral nitrogen was followed by higher grain protein content in MM and SM in 1998. Grain protein content was unacceptably high with bigger amounts of mineral nitrogen., except in 1999 in SM. There was linear relationship between protein and extract content in 1998 but neither linear nor quadratic in 1999. Some of the malting characteristics within the variety arc not so much dependent on nitrogen rates but more in season.