RESPONSE OF MALTING WINTER BARLEY TO AMELIORATIVE NPK-FERTILIZATION PUBLISHEDVlado Kovačević, Josip Kovacevic
Barley covering about 7 % of arable lands in Croatia (56157 ha/year for 2005-2007). Mean yields of barley in this period was 3.56 t/ha with variation among the year from 3.23 to 3.82 t/ha. Close to 50% of barley growing areas have been distributed in Eastern Croatia region (22 % of the state territory). Aim of this study was testing residual response of malting winter barley to ameliorative NPK 7:20:30 fertilization (April 2003: a = 0 + standard fertilization kg/ha: 125 N + 80 P 2 O 5 + 120 K 2 O; b = a+1250; c = a+2500 and d = a+3750 kg/ha). Nitrogen (N) for the a-d treatments were equalized by addition of CAN (calcium ammonium nitrate) in the amounts 974, 649, 325 and 0 kg/ha, for the a, b, c and d, respectively. The experiment was conducted in four replicates by randomized block design (the basic plot 92.4m 2 ). In the next years (2004-2006) only standard fertilization was applied and residual effects of ameliorative fertilization were tested. Malting winter barley (cultivar Lord) was sown at beginning of November 2005 and harvested in term of June 21, 2006. Water shortage in October and November (Daruvar: 38 mm precipitation vsv146 mm for 30-y mean 1961-1990), two-fold higher precipitation in December (131mm vsv 66 mm), the colder winter (mean air-temp. in January-March: 1.5 o C vsv 2.6 o C) and remaining part of barley growth in level close to long-term means, are main characteristics of the 2005/2006 growing season. Fertilization had considerably residual effects on grain yields of winter barley. Under standard fertilization barley yielded 5.42 t/ha. By using of 2500 and 3750 kg NPK 7:20:30 grain yields were increased for 6 % (5.75 t/ha) and 24 % (6.73 t/ha) respectively. However, hectolitre mass, protein and starch contents were independent on the fertilization.
winter malting barley; fertilization; phosphorus; potassium; grain yield