ph reaction in soils of the Eastern Croatia

Reakcija otopine tla značajno utječe na kemijska, fizikalna i biološka svojstva tla kao i na pristupačnost i mobilnost hraniva što se reflektira na rast i razvoj biljaka. U poljoprivrednoj proizvodnji ovaj pokazatelj može biti limitirajući čimbenik. U kiseloj sredini ioni aluminija i mangana mogu imati toksično djelovanje na biljku te je povećana bioraspoloživost nekih teških metala, a smanjena pristupačnost drugih elemenata. U alkalnoj sredini biljci je smanjena pristupačnost većine biogenih elemenata, posebno mikroelemenata (osim Mo). Pri odabiru biljne vrste potrebno je voditi računa o pH reakciji tla jer neodgovarajuće tlo ili biljna vrsta rezultirat će lošim izgledom, propadanjem biljaka i/ili gubitkom prinosa. Provedenim istraživanjem utvrđeno je kako grupi jako kiselih tala (pH < 4,5) pripada 22,0 %, kiselim tlima (pH 4,5-5,5) 26,0 %, slabo kiselim tlima (pH 5,5-6,5) 19 %, grupi neutralnih tala (pH 6,5-7,2) pripada 6,0 %, dok grupi alkalnih (pH > 7,2) tala pripada 27,0 % od ukupno 105 analiziranih uzorka tala na području Istočne Hrvatske. Nakon provedenog istraživanja možemo reći da pH-vrijednosti imaju izrazito heterogen raspon vrijednosti za sve istraživane tipove tala te da je analiza tla neizostavna za poznavanje reakcije tla te samim time i za uspješnu poljoprivrednu proizvodnjuReaction of soil solution have a significant influence on chemical, physical and biological properties of the soil, nutrition bioavailability which is reflected on the growth and plants development. In agricultural production this indicator could be a limiting factor. In acidic soil aluminium and manganese ions can have toxic effects on the plant, bioavailability of some heavy metals are increased and accessibilitiy of other metalsare reduced. In alkaline soil the accesibility of most biogenic elements to the plants are reduced, especially microelements (except Mo). When selecting plant species, it is necessary to take care of pH soil reaction, otherwise inadequate soil or plant species will result in poor plant appearance, plant decay and/or loss of yield. The study found that the group of strongly acidic soils (pH <4.5) belongs to 22.0%, acidic soils (pH 4.5-5.5) 26.0%, weakly acidic soils (pH 5.5-6, 5) 19%, the group of neutral soils (pH 6.5-7.2) belongs to 6.0%, while the group of alkaline (pH> 7.2) belongs to 27.0% of the total of 105 analyzed soil samples in Eastern Croatia . After the research, we can say that the pH values have a very heterogeneous range of values for all investigated soil types and that soil analysis is essential for knowing the reaction of the soil and thus for successful agricultural production