Abstract:
A personal computer is used for the control of the electronic and pneumatic units of in-situ measurement of N
2O emitted from croplands. The introduce of sample, gas chromatographic analysis and integration of the data obtained are undertaken automatically. The ambient temperature and radiation can also be measured with the automatic system. Air samples are alternatively taken from the static chamber installed in fields. After removing of raoisture and CO
2, the sample is injected into GC/ECD system and the N
2O concentration in the headspace of each chamber is then analyzed. The variation of N
2O concentration in the headspace of each chamber can be obtained by which the N
2O emission rate from the area covered by the chamber can be calculated.