Impact of rainfall on Soil co2 flux should be considered in Agriculture

It is well known that agricultural practices release carbon dioxide. Tillage is a type of activity carried out in agriculture that loosens the soil and therefore causes soil co2 flux. The impact of different degrees of tillage in terms of soil co2 flux was studied keeping in mind the fact that soil conditions are affected by fertilization and precipitation.  Alvaro-Fuentes et al. (2010) used a method that depended on collecting data on which statistical analyses of variance were applied. It was found out that soil co2 flux increased with rainfall and therefore co2 emissions depended on how wet or dry the soil is. – Nitya Chhiber
Alvaro-Fuentes, J.,Cantero-Martinez, C., J.,Lampurlanes, Morell, F.J., 2010. Soil co2 fluxes following tillage and rainfall events in a semiarid Mediterranean agroecosystem: Effects of tillage systems and nitrogen fertilization. Agriculture, Ecosystems and Environment 139, 167–173. 

Alvaro-Fuentes et al. (2010) wanted to understand the impact of soil tillage, vis-a-vis the process of soil co2 fluxes. They applied a method that was spread over three years. It must be noted that the climatic conditions used during the period of this study could be described as being of the Mediterranean type. Different tillage systems were used, namely no-tillage system (NT), conservation tillage system (MT) and finally conventional tillage (CT).  To ensure a fair test, the soil co2 flux was measured five times each year. Three abiotic factors that affected the soil were also measured; which were soil temperature, soil water content, and fertilization. As water content was to be considered, measurements of the soil were only carried out during fallow periods. Finally, statistical analysis of data was carried out using the system of analyses of variance.

It was found out that tillage caused an increase in the soil c co2 fluxes, as there was an increase of the air transport coefficient from soil loosening. Precipitation also influenced the soil co2 flux, which increased after rainfall. Soil co2 fluxes also increased when there was increased substrate availability, which in turn occurs when there is soil organic content accumulation, crop residue production and fertilization. Most importantly, the level of soil co2 flux levels was caused by the fluctuation of the soil between dry and wet points. Furthermore, the combination of rainfall with either a no-tillage system or conservation tillage system led to increased co2 fluxes.

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