The influence of mineral fertilizers and water regime on the biological activity of soybean rhizosphere soil | Influenta ingrasamintelor minerale si a regimului hidric asupra activitatii biologice a solului rizosferic al plantelor de soia
2013
Daraban, O., Academia de Stiinte a Moldovei, Chisinau (Republic of Moldova). Inst. de Genetica, Fiziologie si Protectie a Plantelor | Bizgan, I. | Emnova, E. | Toma, S.
The aim of the current study was to assess the extent to which soil mineral fertilization, starter dose, influences the biological potential of soybean rhizosphere under suboptimal soil water content. The experiment was established with 4 replications, in plastic pots (5 kg of absolutely dry soil, carbonate chernozem). The main macro-elements N50 P100 (mg/kg) were applied to the soil in the form of Ca(NO3) 2 and P2 O5 (KH2PO4). Two soil moisture regimes were examined: 70% and 35% of total soil water capacity. At the budding-flowering stage a reduced soil moisture during 17 days was maintained. Two soybean varieties were subjects for study: Aura and Clavera, differing in the degree of drought tolerance. Control soil without plants was also considered. It was determined that soil biological activity depends on the nutritional and water conditions but not as pronouncedly as plant biomass does. The functional activity of the microbiota (BSR basal soil respiration) recorded higher values at a lower water content. This could indicate that bacterial community expends additional energy to perform and maintain its vital processes. The biological potential of Aura variety rhizospheric soil was higher compared to the Clavera one and to the soil without plants.
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