Abstract: In order to study whether reducing the amount of chemical fertilizers will affect the availability of microelement in the facilities vegetable soil, the change of available Fe, Mn and Cu contents in the soil of the facilities vegetable of Shuigaozhuang and Xiaoshawo village of Tianjin were studied by reducing fertilizer application on the basis of applying organic fertilizer, so as to provide reference for rational fertilization of facilities vegetable. The results indicated that the available Fe content was the highest in the 10% chemical fertilizer reduction treatments, and was the lowest in the 25% chemical fertilizer reduction treatments both in the soil of the winter melon shed in Shuigaozhuang and the celery shed in Xiaoshawo; the available Fe content was the highest in the 25% chemical fertilizer reduction treatment in the soil of the tomato shed in Xiaoshawo; the winter melon shed in Shuigaozhuang village and the celery shed in Xiaoshawo had the highest available Mn content when the chemical fertilizer was reduced by 25%, while the tomato shed in Xiaoshawo when reduced by 35%. The available Cu content in the soil of the three vegetable sheds was the lowest with no chemical fertilizer reduction.

Key words: chemical fertilizer reduction, facility vegetables, soil, available Fe, Mn, Cu