Abstract: A field study with greenhouse celery (Apium graveolens L.) showed that compared with basal application of ordinary compound fertilizer, one-time basal application of DMPP-compound fertilizer (ENTEC^®, 12-12-17) at the rates of 67.5 kg N·hm^-2 and 54.0 kg N·hm^-2 increased the yield by 5.78% and 10.14%, respectively. The application of ENTEC^® also improved the nu-tritional quality of edible parts, e . g ., the Vc, amino acid, soluble sugar, N and P contents in-creased, while nitrate content decreased. Compared with basal plus side dressing applications, appropriately reducing the application rate and times of ENTEC^® had more beneficial effects on celery yield and quality, and reduced the production costs. ENTEC^® could suppress the transf-ormation of soil NH₄⁺-N to NO₃^--N effectively, and thus, its application could retain soil residual N more in NH₄⁺-N than in NO₃^--N form after celery harvested,resulting in a reduction of nitrate leaching.

Key words: Biomarkers, Lysosomes, Stress protein, Mettllothioneins