THE INTERRELATION OF CHANGES IN ACID-BASIC PROPERTIES OF ACID BROWN FOREST SOILS IN THE RUSSIAN SUBTROPICS DURING AGROGENIC ACIDIZATION UNDER TEA CULTURE
- The authors:
- Kozlova N. V., Kerimzade V. V.
- Page numbers:
- 160 - 167
- acid brown forest soils, tea plantations, acid-base properties, mineral fertilizers, acidification, Russian humid subtropics.
The paper studied conjugate changes in the acid-base state of acid brown forest soils that have reached a different degree of acidification as a result of a 27-year application of mineral fertilizers (NPK) in various doses in a multifactorial field experiment on tea culture, in the Russian humid subtropics. It is shown that the studied indicators are in close direct or inverse relationship (r = ±0.89–0.99). The nature of the interrelated changes is represented graphically and by approximating linear functions. It was found that a decrease in pHKCl by 0.1 unit on average corresponded to the following: to the growth of hydrolytic and metabolic acidities by 1.66 and 0.88 mg-eq/100 g, mobile aluminum by 7.92 mg/100 g; to a decrease in the amount of exchangeable calcium and magnesium by 0.93 mg-eq/100 g and to a saturation degree of bases by 3.82 %.