UPTAKE OF NUTRIENTS IN TRITICALE

There are reported the results of three-years' investigations of clima tic conditions and fertilization influence on the nutrient balance in triticale grain and straw. The field polyfactorial trials were based b y the Department of Plant Production (University of Agriculture, Nitra ). From the climatic aspect they were located in warm, moderately arid region with slightly acid, loamy brown soil, rich in P and K. Three l evels of fertilization were investigated: A - without fertilization (c ontrol variant); B - 50% NPK in mineral fertilizers and 50 % NPK in ma nure were applied (according to the normative counted for 8 t yield of above soil biomass per hectare); C - fertilization according to the c omplex diagnostic methodology (Michalik, Lozek, 1985). From 1991 to 19 93 the average content of macronutrients was: 2.376% N, 0.479% P, 0.47 7% K, 0.042% Ca, 0.216% Mg in grain and 0.466% N, 0.064% P, 1.146% K, 0.275% Ca, 0.133% Mg in straw. In 1991 Mg content was the lowest in gr ain and especially in straw. In 1993 P content was the lowest in straw . In this year Ca and K contents were the lowest in grain. The smalles t changes were observed in N content. One t of biomass exploited 24.4 kg N, 4.7 kg P, 13.9 kg K, 2.7 kg Ca and 3 kg Mg. The fertilization ha d no considerable influence on the consumption of nutrients by 1 t bio mass. The consumption of nutrients by yield was significant and high s ignificant according to the cultivation and climatic conditions. The c onsiderable decrease in the yield and macronutrients consumption was o bserved in very arid 1993 year. The yield (4.4 t per hectare) was abou t 40 % lower as in 1991 and 1992. The results confirm that the climate conditions during the year and in individual years are ones of the fa ctors that have an influence on the yield and consumption of nutrients by biomass.