Changes in Nitrogen Mineralization as Affected by Soil Temperature and Moisture
2018
Xin-Lei Wang, Chonnam National University, Gwangju, Republic of Korea | Park, S.H., Chonnam National University, Gwangju, Republic of Korea | Lee, B.R., Chonnam National University, Gwangju, Republic of Korea | Jeong, K.H., National Institute of Animal Science, Rural Development Administration, Wanju, Republic of Korea | Kim, T.H., Chonnam National University, Gwangju, Republic of Korea
Soil is the main nitrogen (N) provider for plants but N in soil is not all available to advanced plants. Mineralization is a critical biological process for transferring organic N to inorganic N that can be used by plants directly. To investigate the effect of different levels of soil temperature and water content to soil mineralization, a field experiment was established on three different sites (A, B and C). We measured soil temperature, moisture and electrical conductivity once daily after swine slurry application. Average soil moisture and temperature in site A is the highest among three sites (40.9% and 9.7℃ , respectively). Following is in site C (37.3% and 9.6℃ ) and the lowest is in site B (28.0% and 9.0℃ ). Ammonium N (NH4+-N) and nitrate N (NO3--N) were determined on the first and fifth day after treatment. Compared with site B and C, site A always had the highest soil total N content (1.54 g N kg-¹ on day one; 1.22 g N kg-¹ on day five) and highest NO3-- N content (93.18 mg N kg-¹ on day one; 16.22 mg N kg-1 on day five) and a significant decrease on day five. Content of NH4+-N in site B and C reduced while in site A, it increased by 6.7%. Results revealed that net N mineralization positively correlated with soil temperature (P less than 0.5, r=0.675*) and moisture (P less than 0.01, r=0.770**), suggesting that to some extent, higher soil moisture and temperature contribute more to inorganic N that can be used by plants.
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