Currently, seaweed extracts are widely used as plant biostimulants to increase the efficiency of nutrient use, tolerance of abiotic stress, and improve plant quality. In this study, tested the effect of different Padina minor seaweed extract formulas (liquid extract and powder extract) and the frequency of application of Padina minor seaweed extract (b0 = control; b1 = 1 x application; b2 = 2 x application; and b3 = 3 x application) as a biostimulant to the growth of upland rice. From the results of the study, it was found that there was no significant effect of the application of the two extract formulas and the frequency of application, but the administration of Padina minor extract 3 times during vegetative growth increased all growth parameters, such as: plant height, number of tillers, fresh and dry weight of plants, and chlorophyll content. It was concluded that giving Padina minor extract 3 times could increase the vegetative growth of upland rice effectively.
Seaweeds are an important sustainable marine source and extracts from them have been applied as plant biostimulants. Seaweed-based extracts have been recently employed as sustainable tools to improve abiotic stress tolerance and increase growth and quality of plant. The research aimed to evaluate the effect of liquid seaweed extracts from some species of seaweeds with different concentrations on vegetative growth of soybean. Samples of seaweed were collected on Kasiak Gadang Island, Nirwana Beach, Padang, West Sumatra. Species of seaweed we tested were Padina minor, Sargassum crassifolium, Sargassum cristaefolium and Turbinaria decurrens and concentration of liquid extracts were control, 0.1%, 0.2%, 0.3%, and 0.4%. The result showed that P. minor liquid extract increasing some parameters including height, number of leaves, number of branches and fresh weight. While the dry weight of soybean was similar among the treatments in soybean. 0.4% concentration of seaweed extract significantly improves all parameters of vegetative growth of soybean.
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