Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 2
Written by Gheorghe JIGĂU, Sergiu DOBROJAN, Galina DOBROJAN, Iulian JIGĂU
Through the perspective of the biophysical concept and the priority role of the interdetermined and interdependent processes of humus formation and accumulation, as well as aggregation-structuring in the realization of the chernozem process of solification, materialized in the pedofunctional system [bioenergetic system]↔[aggregate system], the basic physical parameters of chernozems are the indices of the structural-aggregate state. The changes in the composition and functioning of the humic system, induced by the inclusion of agricultural chernozems in the agricultural circuit, led to the establishment of an evolution trend of the aggregate system, indispensable and dependent on the tillage system. At the hierarchical level of the microaggregate, the evolution of the structural-aggregate indices is manifested by the increase in the content of microaggregates > 0.01 mm. At the hierarchical "aggregate" level, the evolution processes of the aggregate system materialize in the stable tendency of regeneration of the aggregation-structuring process and its intensification, as the degree of soil disturbance. At the same time, however, the 5-year period is insufficient to ensure a unidirectional trend of stabilization (hydrostabilization) of the aggregate structure, the main limiting factor being the insufficient humus content.
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