Biostimulants as a Means to Alleviate the Transplanting Shock in Lettuce

When transplanting vegetable plants in the field, transplants undergo a small or large setback growth, known as shock. Various practices are commonly applied to reduce In past two decades, several studies have shown that application of microbial and non-microbial biostimulants can enhance plant tolerance against abiotic stresses. However, there is no information on effect applying at time mitigating shock lettuce field. Lettuce seedlings transplanted into soil an unheated plastic greenhouse were treated with biostimulants, one (Bactiva®) (Isabion®), day after 14 21 days. During production, development, chlorophyll fluorescence compositional parameters determined. According results, biostimulant had significant some measured parameters, leaves having higher index (CCI) by 8%, well Fm/Fo, Fv/Fo, Fv/Fm area 7, 10, 3, 27%, respectively, but fewer total soluble phenols lower parameter ABS/RC 7 26%, compared control untreated ones. The above may constitute effects shock, without, however, being accompanied number leaves/plant, leaf color (L*, a*, b*, C*, ho), (a, b, + b), carotenoid, dry matter, nitrate content, along antioxidant capacity fresh weight harvest. notable was greater percentage harvest 351–400 class, while greatest 301–350 g class. contrast, any determined control. Therefore, under conditions present study, effectiveness questionable.