EFFECT OF PHOSPHORUS APPLICATION ON THE RATES AND EFFLUX OF CO2 FROM SOIL: 14С LABELING STUDY
Abstract
Global Warming as one of the most important environmental challenge in the XXI century affects crop production, and, thus, is considered as a thread for food security worldwide. Studying the influence of any factors for CO2 efflux is the call of the day. Despite of numerous studies on this topic, the single effect of phosphorus application on CO2 production in soils was poorly understood. Current study aimed to evaluate the influence of increasing P levels with and without C source on CO2 emission rates and total CO2 efflux, and define the source of CO2 by 14C application. P application affects CO2 emission rates significantly at P50 in dormant stage when no C was applied. However, activation of soil microorganisms by C50 led to no P effect within one day after application. Total CO2 efflux 120 h after P50 addition was 1,5 and 2 times greater for no C and C50 treatments respectively, if compared to the mean values for P0 and P10. Nevertheless, experiment with plants should be done to determine the net CO2 emission and take into account the positive effect from P application. The incremental P levels resulted in lower 14CO2 rates for no C treatments, and had the reverse effect at C50 during the first day of experiment. These findings may be further useful for determination the contribution of each component to the global CO2 emission.
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