KOREASCHOLAR

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°C, respectively). Following is in site C (37.3% and 9.6°C) and the lowest is in site B (28.0% and 9.0°C). 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<0.5, r=0.675*) and moisture (P<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.

ABSTRACT
 Ⅰ. INTRODUCTION
 Ⅱ. MATERIAL AND METHODS
  1. Experimental design
  2. Soil sampling
  3. Chemical analysis
  4. Statistical analysis
 Ⅲ. RESULTS AND DISCUSSION
 Ⅳ. ACKNOWLEDGEMENTS
 Ⅴ. REFERENCES

• Xin-Lei Wang(Department of Animal Science, Institute of Agriculture Science and Technology, College of Agriculture & Life Science, Chonnam National University)
• Bok-Rye Lee(Department of Animal Science, Institute of Agriculture Science and Technology, College of Agriculture & Life Science, Chonnam National University)
• Tae-Hwan Kim(Department of Animal Science, Institute of Agriculture Science and Technology, College of Agriculture & Life Science, Chonnam National University) Corresponding author
• Sang-Hyun Park(Department of Animal Science, Institute of Agriculture Science and Technology, College of Agriculture & Life Science, Chonnam National University, Institute of Environmentally-friendly Agriculture, Chonnam National University)
• Kwang-Hwa Jeong(National Institute of Animal Science, Rural Development Administration)