Influence of Soil Tillage and Organic and Mineral Fertilization Estimated by Synthetic Indicator (ISFS%) of Soil Fertility in Reddish Preluvosoil from Moara Domneasc?? - Ilfov

摘要

In a long-term experiment, with different basic soil tillage and kinds of organic and/or mineral fertilization, different analyses were achieved to determine the evolution of the soil fertility status of reddish preluvosoil from the Didactic Experimental Station of Moara Domneasca-Ilfov . There was determined, in arable layer: respiration potential, cellulolyse, and Indicator of Vital Activity Potential (IVAP%) was calculated; also, catalasic potential and total amidasic and phosphatasic potentials and the Indicator of Enzymic Activity Potential (IEAP%), than, the Biological Synthetic Indicator (BSI%) was calculated. Humus content (Ct%), huminic acid content (Ch%) and pH-H 2 O constitute the Chemical Synthetic Indicator (CSI%). BSI% + CSI% / 2 = SIFS% (Synthetic Indicator of Soil Fertility). Test results and their statistical processing showed that IVAP%, with certain value, the highest, was obtained where continuous were tilled with the chisel and it was fertilized with N 100 P 70 . IEAP% with maximum value was achieved in all modes of fertilization. Biological Synthetic Indicator (BIS%) shows that chisel achieved optimal biologic conditions in N 100 P 70 variant. CSI% shows that only to chisel and disk tillage, the composted stable manure (that was in extremely low quantity) allowed higher accumulation of nutrients than when the furrow was overthrown by plowing. Synthetic Indicator of Soil Fertility (SISF%), which it refers only to the soil characteristics, shows maximal values only for superficial and loosening soil tillage, in the annual supply conditions with nitrate ammonium and superphosphate.