Stock change factor for input of organic matter(FI),representing different levels of C input to soil such as or鄄
ganic material application,crop residue treatment and green manure crop cultivation,was computed with the long鄄
term field experimental data in Lopburi Agricultural Research and Development Center,DOA,Lop Buri Province,
Thailand. While the computed FI of “High input with manure冶 was within the range of IPCC default FI value,
some of the computed FI of “High input without manure冶 was much higher than the IPCC default though it was
varied due to the biomass production and nutrient contents of the green manure crops planted as the second crops
after corn. The F
I computed by field experimental results can contribute to more accurate estimation of SOC chan鄄
ges in farm land especially in Southeast Asia because the default FI mostly depends on the experimental data in
temperate zones郾
The long鄄term field experiment in the present study has been continued. Since 2011 the experiment has fo鄄
cused the effect of reduced tillage practices on SOC changes and corn yield. The results of the experiment will be
used to compute FMG which represents the effects of tillage operations郾