Effects of Long Term Application of Organic and Mineral Fertilizers on Soil Enzymes

Abstract

Long term productivity and conservation of soils is critical for sustaining agricultural ecosystems. The specific objective of the work reported was to determine the effects of long term application of organic and mineral fertilizers on soil enzyme activity as an index of soil biology and biochemistry. Three key soil enzymes involved in intracellular metabolism of microorganisms and two soil enzymes involved in phosphorus metabolism were selected. Actual and potential dehydrogenase, catalase, acid and alkaline phosphatase activities were determined in the 0-20 cm layer of an eroded soil submitted to a complex fertilization experiment. Results showed that addition of mineral fertilizers to organic (green manure and farmyard manure) fertilizers led to a significant increase in each activity because of increased plant biomass production which upon incorporation stimulates soil biological activity. The enzymatic indicators of soil quality calculated from the values of enzymatic activities depending on the kind of fertilizers showed that by the determination of enzymatic activities valuable information can be obtained regarding fertility status of soils. A weak positive correlation between enzymatic indicators of soil quality and maize yield was established. The yield data demonstrate the superiority of farmyard manure which provided greater stability in crop production. Substantial improvement in soil biological activity due to application of organic fertilizers with mineral fertilizers contribute in maintaining the productivity and soil health.

Aspects Regarding the Relationship Between the Stability of Six Magnesium Compounds and their Cellular Uptake in Mice

“…All the results are plotted in Figures 3-5. Considering the importance of magnesium for the human body, as well as the deficient supply of magnesium due to soil pollution and the excessive use of chemicals as fertilizers [19][20][21][22], the use of food supplements containing magnesium is increasingly common in medical practice. Dietary intake of low magnesium leads to low serum magnesium concentrations and this phenomenon has been associated with an increased risk of cardiovascular diseases, osteoporosis and metabolic disorders, including metabolic syndrome and high blood pressure.…”

Method of Selecting a Decontamination Site Deployment for Chemical Accident Consequences Elimination: Application of Multi-Criterial Analysis

“…Therefore, it is essential for the intervention commander-or the Chemical Troops unit-to have accurate and detailed information about the geographic environment, especially in a case when the action must be carried out in a vast area that is not known and explored in advance. Such an action may be, for example, decontamination of civilians after the use of weapons of mass destruction, or a consequence of leakage of dangerous industrial substances after an industrial infrastructure device accident, or an extensive use of extermination agents causing the occurrence of biological contamination [18][19][20]. Among the background information that a commander may get is also the evaluation of the influence of the geographical environment on a specific activity that shall be carried out within the decontamination action.…”

Removing of the Sulfur Compounds by Impregnated Polypropylene Fibers with Silver Nanoparticles-Cellulose Derivatives for Air Odor Correction

“…Thus, in order to determine which are the different gaseous chemicals that produce unpleasant odors, it is necessary to start from the components that appear in the most diverse cases ( Table 1 ) [ 44 , 45 , 46 , 47 , 48 , 49 ].…”