关键词: 海洋类土壤改良剂, 土壤, 烤烟, 理化性状, 生物特性, 产量

Abstract: In order to study the effects of ocean soil conditioner, this paper carried out field comparative experiments to study the effects of 3 ocean soil conditioners: shrimp peptide, fish protein and algae fertilizers on soil physicochemical properties, flue-cured tobacco growth and yield. The results showed that applying shrimp peptide fertilizer 55 d after transplanting could effectively improve soil hydrolysis nitrogen and available potassium contents, but had no significant effect on growth and yield of flue-cured tobacco; applying fish protein fertilizer could effectively improved the hydrolysis nitrogen, available phosphorus and available potassium level at  55 d, and also significantly increased the root system activity, maximum length of middle leaves and dry matter accumulation. Its yield and value of cured leaves were increased by 27.79% and 29.84%, respectively， as compared with the control treatment; applying algae fertilizer could significantly reduced the soil bulk density at  75 d, and effectively improved the hydrolysis nitrogen, available phosphorus and available potassium level at 55 d, and also obviously increased the maximum length of middle leaves and dry matter accumulation. Its yield and value of cured leaves were increased by 11.75% and 20.05%, respectively，  compared with the control treatment. In summary, applying fish protein fertilizer and algae fertilizer could improve the soil fertility at certain degree, effectively promote the growth of flue-cured tobacco, and significantly increase tobacco leaf yield.

Key words: ocean soil conditioner, soil, flue-cured tobacco, physicochemical property, biological characteristic, yield