Seaweeds and seaweed products have been applied in vegetable production systems for many years. This is because seaweeds have beneficial effects in vegetable production systems. However, the mechanism by which seaweed can elicit the growth and development response is still not fully understood. Mineral nutrient concentrations are commonly too low to be effective, and plant growth regulators (PGR) have been suggested as a causal factor. PGR activity in two seaweed products (Maxicrop ® and Seasol ®) was investigated using field pea (Pisum sativum L.) bioassays. Treatments included a control, standard concentrations of the seaweed products, ashed seaweed products, auxin, cytokinin, gibberellin and mineral nutrients (matched to each seaweed product). The results obtained show that the seaweed products have potential plant growth regulator activity rather than a mineral nutrient effect alone. Ashing reduced the root growth effect of Seasol ® but not Maxicrop ®. Seasol ® performed better than Maxicrop ® based on the root and shoot length.

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Onion ( Alliumwakegi Araki) is a popular herb and vegetable commodity that can be used as a flavoring dish or traditional medicine. This study aims to determine the effect of light intensity for callus growth. This research was conducted at Plant Biotechnology Laboratory, Faculty of Agriculture, Tadulako University using Completely Random Design (RAL) with a single factor that is light intensity (A) consisting of 3 levels, i.e., 0-100 lux (A1), 300-800 lux (A2) and 1000-4000 lux (A3). The results showed that the onion cultured on the light intensity 1000-4000 lux accelerated the formation of onion callus varieties of lembahpalu. This callus began to form at 13.17 days after cultured. The light intensity 300-800 lux accelerated callus formation at a high percentage and embryonic callus cells. The percentage of callus formation reached 32.46%, resulting callus color was white up to 4 WAC (Week After Culture). The average color of white callus was found on 4 WAK with the average texture of crumb callus, while at the 6th and 8th WAC the color of callus was yellow.

Lettuce (Lactuca Sativa L.) is one the most popular leaf vegetable in Indonesia. Hydroponic systems do not require extensive land cultivation. The advantages of using hydroponic systems is that it has higher production with more efficient land use. Seaweeds have been reported to be used as a fertilizer. This study aims to determine the effect of various nutrient solutions on the growth and yield of lettuce plants with hydroponic system. This study used a randomized block design (RBD), with five treatments: N1=OLF (organic liquid fertilizer) solution, N2=OLF solution + spray, N3=Seaweeds extract solution, N4=Seaweeds extract solution + OLF solution, N5=AB mix (Nutriponik). Each treatment was repeated 4 times, so that there were 20 units of experiment. Each unit of experiment consist of 5 plants so that the total population was 100 plants. The results showed that the AB mix nutrient solution gave the best growth responses. It produced an average plant height, number of leaves, total fresh weight of plant, and total dry weight of plants better than other solutions.

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