MINERALISATION OF ~(14)C-LABELLED GLUCOSE IN LITTER AND SOILS FROM SUGARCANE FIELDS AS AFFECTED BY MINERAL NITROGEN

摘要

For the litter (Fig. la), the ~(14)Cremaining unmineralised had the following trend: glucose > glucose + ammonium ＞ glucose + nitrate, whilst in the soil (Fig. 1b), glucose and glucose + ammonium had higher value of ~(14)C remaining compared to glucose + nitrate. The higher mineralisation of glucose in the treatment glucose + nitrate is explained by the assimilatory reduction of this anion by microorganisms during the immobilisation, when glucose was the source of C for this process. Higher amount of ammonium was immobilised compared to nitrate.