Soil Allelotoxicity and Methods to Reduce Its Adverse Influence at the Initial Stage of Plant Development

Abstract

The application of sorption preparations (SP) based on bentonite-humate mixtures for seed stimulating treatment upon sowing into the soddy-podzolic soil (Albic Retisols (Loamic, Aric, Cutanic, Ochric)) was studied. The correlation between seeds’ inhibition by soil and the efficiency of SP application was found. The SP treatment was not always efficient for spring wheat cultivars. For some of the cultivars, it caused inhibition of seed germination and seedlings development. The intake of essential biologically active substances (BAS) from soils to seeds was limited in these cases because of the firm fixation of these substances in SP. The brewer’s yeast autolysate (BYA) introduced to the SP mixture made it possible to fill the active centers of sorbents and to avoid the fixation of BAS from soil. The obtained preparation eliminated inhibition of seed development at the initial stage upon SP application. The efficiency of previously known individual stimulating substances sharply increased upon their combined application with SP and BYA mixture.