| Abstract: In order to study the effect of adding fish protein organic liquid fertilizer instead of chemical fertilizer, the effects of adding fish protein organic liquid fertilizer on growth, yield, fruit characters and soluble solids content of tomato were compared and analyzed by applying high potassium water soluble fertilizer of 5.0 kg per
667 m2 as control, three chemical fertilizer reduction treatments were applied, including high potassium watersoluble fertilizer 3.5 kg + fish protein organic liquid fertilizer 5.0 L per 667 m2, high potassium water soluble fertilizer 2.0 kg + fish protein organic liquid fertilizer 5.0 L per 667 m2, and high potassium water soluble fertilizer 0.5 kg + fish protein organic liquid fertilizer 5.0 L per 667 m2. The results showed that under the condition of applying fish protein organic liquid fertilizer 5.0 L per 667 m2
and reducing the amount of watersoluble fertilizer, the plant height, leaf length and leaf width of tomato were decreased, but the stem diameter
and the vertical and horizontal diameter of tomato were promoted. There was no significant difference in fruit longitudinal diameter among different treatments, the fruit shape index and soluble solids content increased firstly and then decreased with the decrease of water-soluble fertilizer amount. The fruit shape indexes were both the highest with topdressing high potassium water-soluble fertilizer of 3.5 kg or 2.0 kg per 667 m2 each time, but there was no significant difference with other treatments. There was no significant difference in the average number of fruit set per ear among different treatments, and the change trends of single fruit weight and fruit diameter were consistent. The plot yield was the highest when high potassium water-soluble fertilizer was applied with 0.5 kg per 667 m2. Therefore, under the condition of pursuing yield, the fertilizer ratio of 0.5 kg of high potassium water-soluble fertilizer and 5.0 L fish protein organic liquid fertilizer per 667 m2 applying before fruit expansion and harvest was the most suitable treatment for production. If the quality was pursued, the ratio of 2.0 kg of high potassium water-soluble fertilizer and 5.0 L fish protein organic liquid fertilizer per 667 m2
was beneficial to the production, and the content of soluble solids and the yield per 667 m2 were increased by 5.8% and 17.2%, respectively, compared with the control. |