Uticaj zakišeljavanja na sadržaj vodorastvornog aluminijuma u pseudoglejevima

Abstract

Rezultati eksperimenta pokazuju da sa rastućim dozama kiseline pH rastvora opada nejednako u različitim pseudoglejevima. Ukupni aluminijum u rastvoru (Altot) ima tendenciju blagog porasta od pH 6,0 do oko 4,0, a zatim se naglo povećava. Monomerni aluminijum (Almono) se javlja u zemljištu sa pH 5,5 i niže. Procenat Almono/Altot je niži u zemljištu Salaša i Jabučja i dostiže 100 % na pH 3,09 i 3,40, a u Kladovu i Arilju na pH 4,10 i 4,41. Iznad ovih pH vrednosti postoji manje toksični polimerni Al, što je važno u prognozi štetnog efekta Al na biljku. Na osnovu dinamike Altot, a posebno Almono, može se zaključiti da je pri acidifikaciji manji štetni efekat, a time i manji rizik za biljnu proizvodnju, u pseudoglejevima sa većom pH, CEC i % baza, i nekim manje reaktivnim Al rezervama.

The results show that solution pH in different soils decreased unevenly with rates of acid. Total aluminium has a tendency to gradually increase from pH 6.0 to about 4.0, and then Altot is abruptly released. Almono occurs in soils of pH 5.5 and lower. The percentage of Almono/Altot is lower in soils of Salaš and Jabučje and it reached 100% at pH equal to 3.09 and 3.40, and in Kladovo and Arilje it accounted for 100% at pH equal to 4.10 and 4.41. Above these pH values there are less toxic polymeric Al, which is important in assessing the adverse effects of Al on the plant. Based on the dynamics of Altot, and especially of Almono, it can be concluded that a less detrimental effect of acidification on Al mobilisation occurred in pseudogleys with higher pH, CEC and base saturation, and with lower levels of some reactive Al reserve.