Enzymatic tests on the fertility of soils
1985
Stefanic, G. | Chirnogeanu, I. (Institutul de cercetari pentru cereale si plante tehnice, Fundulea (Romania))
Soils from 17 different ecological conditions in Romania, having been submitted to long-term experiments with chemical fertilizers, were put to agrochemical and agrobiological (enzymatic) tests, in order to determine the most relevant trials for the estimation of the fertility level of soils. The results made it possible to obtain a biological criterion reflecting, in accordance with several agrochemical tests (pH2 Carbon extractibility, total nitrogen content), the fertility level of soils. The authors defined soil fertility as a biological feature of soil and demonstrated that the dehydrogenasic, together with the catalasic activity may constitute the Biological Index of Soil Fertility (IBF) by their weighted arithmetic mean (IBF=(AD+KAC)/2)) K representing the weighing coefficient. The conclusions of the study reveal that chemical fertilizers, applied rationally, increase the fertility level of the acid soils with low humus content and may depreciate the fertility of the normal ones.
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