Effects of reducing nitrogen fertilizer and applying different bio-organic fertilizers on growth, yield and quality of celery

In order to clarify the effect of bio-organic fertilizer combined with chemical fertilizer on the growth of celery and provide theoretical basis and technical support for local celery high-quality production, we studied the effects of 15%, 30% and 45% nitrogen reduction combined with three different biological organic fertilizers on the growth, yield and quality of Apium graveolens in a field plot experiment with no fertilizer (CK) and only fertilizer (CK1) as the control.The results showed that celery plant height and stem diameter of T8 treatment(30% nitrogen reduction+" Zhongnong Lvkang Lvdikang")was 26.5% and 27.3% higher than those of CK1, respectively. The yield of T2 (30% nitrogen reduction+" Zhongnong Lvkang"), T5 (30% nitrogen fertilizer reduction+" Xingnong Jingzan") and T8 (30% nitrogen reduction+" Zhongnong Lvkang Lvdikang") treatments was 124 t·hm^-2, 126 t·hm^-2 and 127 t·hm^-2, respectively.T8 treatment was with the highest yield, significantly increased by 15.4% than that of CK1.The nitrate content of T8 treatment was with 78.9 mg·kg^-1, lower than all fertilization treatments, and significantly lower than that of CK1 by 73.2%.The T8 treatment significantly increased the vitamin C content and soluble protein content of celery.The treatment of 30% nitrogen reduction combined with the application of biological fertilizer significantly improved the growth, the quality and efficiency of celery."Zhongnong Lvkang Lvdikang" biological fertilization was with the best effect, suitable for local promotion.