Open Journal of Soil Science

Volume 2, Issue 3 (September 2012)

ISSN Print: 2162-5360   ISSN Online: 2162-5379

Google-based Impact Factor: 1.36  Citations  

Soil Organic C:N vs. Water-Extractable Organic C:N

HTML  Download Download as PDF (Size: 671KB)  PP. 269-274  
DOI: 10.4236/ojss.2012.23032    7,909 Downloads   14,637 Views  Citations

ABSTRACT

Traditionally, soil-testing laboratories have used a variety of methods to determine soil organic matter, yet they lack a practical method to predict potential N mineralization/immobilization from soil organic matter. Soils with high micro-bial activity may experience N immobilization (or reduced net N mineralization), and this issue remains unresolved in how to predict these conditions of net mineralization or net immobilization. Prediction may become possible with the use of a more sensitive method to determine soil C:N ratios stemming from the water-extractable C and N pools that can be readily adapted by both commercial and university soil testing labs. Soil microbial activity is highly related to soil organic C and N, as well as to water-extractable organic C (WEOC) and water-extractable organic N (WEON). The relationship between soil respiration and WEOC and WEON is stronger than between respiration and soil organic C (SOC) and total organic N (TON). We explored the relationship between soil organic C:N and water-extractable organic C:N, as well as their relationship to soil microbial activity as measured by the flush of CO2 following rewetting of dried soil. In 50 different soils, the relationship between soil microbial activity and water-extractable organic C:N was much stronger than for soil organic C: N. We concluded that the water-extractable organic C:N was a more sensitive measurement of the soil substrate which drives soil microbial activity. We also suggest that a water-extractable organic C:N level > 20 be used as a practical threshold to separate those soils that may have immobilized N with high microbial activity.

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R. Haney, A. Franzluebbers, V. Jin, M. Johnson, E. Haney, M. White and R. Harmel, "Soil Organic C:N vs. Water-Extractable Organic C:N," Open Journal of Soil Science, Vol. 2 No. 3, 2012, pp. 269-274. doi: 10.4236/ojss.2012.23032.

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