Effects of long-term fertilization and fallowing on soil nitrogen mineralization and exogenous NO3 (-) -N transformation
Ai, N.; Zhou, J.-B.; Yang, X.-Y.; Liang, B.
Ying Yong Sheng Tai Xue Bao 19(9): 1937-1943
2008
ISSN/ISBN: 1001-9332 PMID: 19102306 Document Number: 624455
Soil samples were collected from a 17-year fertilization experiment site in southern Loess Plateau to study the effects of different fertilizations and fallowing on the characteristics of soil nitrogen mineralization, and the transformation of exogenous NO3(-) -N in sterilized and non-sterilized soil samples. The results showed that a combined application of manure and chemical NPK and long-term fallowing increased the contents of soil organic matter, total N, and mineralized N, as well as the N mineralization rate significantly, compared with the control. Applying chemical NPK increased soil inorganic N content, but had less effects on the contents of soil organic matter, total N and mineralized N, as well as the N mineralization rate. Autoclaved sterilization resulted in a significant increase of soil NH4(+) -N content, while soil NO3(-) -N content remained relatively constant whether sterilization or not, suggesting that under the conditions of our incubation, abiotic and biological factors had no significant effects on the transformation of exogenous NO3 (-) -N.