Predicting N mineralized in a Georgia Coastal Plain field

被引:20
作者
Egelkraut, TM [1 ]
Kissel, DE [1 ]
Cabrera, ML [1 ]
Adkins, W [1 ]
机构
[1] Univ Georgia, Dept Crop & Soil Sci, Athens, GA 30602 USA
关键词
ammonification; N balance; N mineralization tests; N modeling; nitrogen mineralization;
D O I
10.1023/A:1023306500473
中图分类号
S15 [土壤学];
学科分类号
0903 [农业资源与环境]; 090301 [土壤学];
摘要
The N mineralized from soil organic matter provides an important portion of N available for crop production. The objective of this study was to determine the amount of spatial variability in N mineralization potential in a field and to evaluate three different methods that might be used to estimate this variability. The three methods tested included predicting the N mineralized from surface soil properties as well as from a biological and a chemical procedure. Three soils varying in N mineralization potential were selected for the study from a field in the Georgia Coastal Plain. The N mineralized from these soils was determined by an N balance of unfertilized and cropped plots. The amount of N mineralized could not be reliably predicted from surface soil organic C, although surface soil clay concentration was positively correlated with the N mineralized. The N mineralized that was predicted using mineralization parameters determined by aerobic incubation, adjusted daily for soil water content and temperature, was approximately 50% of the field measurements of N mineralized. The values of NH4-N extracted with hot 2 M KCl were related significantly to N mineralized in the field ( r(2) = 0.60) and also to the zero order rate constant of mineralization, k(0) ( r(2) = 0.77), determined from the N mineralized in the aerobic laboratory incubation.
引用
收藏
页码:1 / 12
页数:12
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