WANG Mengli1，2，WEI Jingjing1，2，ZHOU Shiyang3，WU Qingtao3，LI Maogui3，ZHOU Rong1，2，JIANG Fangling1，2，WU Zhen1，2*
Four biostimulants（seaweed extract，amino acid，chitosan and‘Haijingling’）were selected to study the effects of different biostimulants on the growth，yield and quality of‘ Majianghongsuan’using field experiments．Different spraying concentrations were set during the green turning period of‘Majianghongsuan’．Different spraying times were set throughout the entire growth period of ‘Majianghongsuan’（i.e.，spraying once during the seedling stage，spraying once during the seedling and bolting stages，respectively，and spraying once during the seedling，bolting，and bulb expansion stages，respectively）．The results showed that spraying 0.25 g·L-1 seaweed extract，1 g·L-1 amino acid，and 0.5 g·L-1‘ Haijingling’on the leaves significantly increased plant height，pseudostem length and pseudostem thickness of ‘Majianghongsuan’．Bulb yield and soluble sugar content increased by 15.08%-19.42% and 19.17%-26.66%，respectively，when applying the biostimulants as compared with the control．Spraying seaweed extract，amino acid and‘Haijingling’ for three times significantly increased the plant height，pseudostem thickness，leaf width and bulb yield of ‘Majianghongsuan’，where the yield of bulbs was positively related to the apraying times of biostimulants．The contents of soluble sugar，soluble protein，VC and allicin in bulb were increased by four biostimulants in varying degrees during the experiment of spray times．In summary，0.25 g·L-1 seaweed extract or 1 g·L-1 amino acid or 0.5 g·L-1‘Haijingling’ during the seedling stage can increase production and quality of‘ Majianghongsuan’．Spraying biostimulants during the seedling，bolting and bulb expansion stages has the best effect in increasing garlic yield．
