改种
3.TOC of topsoil decreased drastically after 3 years of continuous corn cultivation although marked increase of DOC and SMBC was observed in the corn field.
4.If you have such space, taking the advantage of this season to be cleared away one time well too wasteful.
5.Therefore if you go to reseed or replant you garden come Spring, do not over-till the soil but rather simply dig small holes to plant the new seeds or sprouted plants from your hothouse.
6.C pools of total organic carbon(TOC),dissolved organic carbon(DOC) and soil microbial biomass carbon(SMBC) was determined for bulk soils from the two fields respectively. Soil particle size factions(PSFs) were separated using low energy ultrasonic dispersion and the TOC of them determined using CNS analyzer. Selected samples of bulk soil and PSFs from both rice and corn fields were used for 13C natural abundance measurement with Finnigan MAT251 mass spectrometer.


