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Seaweed extracts in plant cultivation

Seaweed extracts in plant cultivation

Seaweed extracts in plant cultivation research show that the application of seaweed extracts in plant cultivation exhibits positive effect on cultivated plants. Algae extracts improve plant resistance to frost and drought and increase crop yields. Plants sprayed with the use of seaweed extracts are also characterized by higher resistance to pests and pathogens and more efficient consumption of nutrients from soil.

Seaweed extracts contribute to the recovery of damages caused by insects and bacterial or fungal diseases. Formulations basing on algal extracts are rich in phytohormones (gibberelins, auxins, cytikinins), amino acids and fatty acids which are responsible for plant growth, development and resistance to pathogens.

Biostimulant activity of extracts obtained from marine algae is connected with the presence of plant growth regulators, particularly cytokinins mainly responsible for plant aging delay, mitosis induction, stimulation of chloroplast maturation, growth of shoot and lateral buds. The amount of cytokinins changes and their ratio to other plant growth hormones depends on the species of algae resulting in different effects of seaweed extracts on plant cultivation.

Seaweed extracts can be delivered to plants in many ways. Soaking of seeds in algal extracts is one of the methods. This way of treatment can effect seeds germination. Foliar and classical soil application can be used as well. In addition to application methods, also the concentration of seaweed extract, species of algae, plant variety affects the efficiency of seaweed extracts as plant biostimulants.

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How does salt water affect plant growth 2020

How does salt water affect plant growth? It’s not salt which is the problem, it’s too much salt. All living things on Earth need some salt. But too much salt is poisonous to plants, just as it is to animals, such as ourselves. The presence of too much salt impacts the plant’s appearance, hydration, and growth. Thus saltwater affects plant growth.

When there is too much salt in the soil, which happens if it is regularly flooded with seawater or saltwater or if poor land management leads to salinization. Soil can also become salty due to the excessive use of chemical fertilizer.

Saltwater negatively affects plant growth by dehydrating them. Plants observe water via their root system through osmosis. However, these highly-permeable root cells work in the opposite direction when the soil has a high salt content. This means the salt in the soil can actually pull water out of the cells and dehydrate the plant.

This excess salt interferes with the chemical reactions in cells which the plant needs to make food and to grow. As a result, the plant’s growth is stunted and the plant may even die.


Osmosis is the procedure in which water absorption through semi-permeable membranes happens at high concentration levels.

Semi-permeable membranes pertain to tissues found in the plant roots; from there, water will be transported to an area with much lower concentration levels.

Freshwater, along with vitamins and minerals found in the soil, flow freely to the roots and up to the stem, leaves, and other parts of the plants distributing the nutrients effectively.

When salt is present in the water, it tends to play tug of war with the roots. The roots pull in the available water while the salt pulls out the water. After regular exposure to too much sodium, plants will shrivel and die.

How nutritional imbalance effects plant growth

While most living things need some salt, too much of it can be toxic. This is true in plants, although some can withstand sodium and are more salt-tolerant than others are.

Salt is a nutrient that can be absorbed by the plant. When an accumulation of sodium happens, it can severely alter the chemical composition, thus resulting in nutritional imbalance.

How dehydration effects plant growth

As we have discussed how osmosis works, sodium can have a negative impact on plants, sometimes confusing the caregiver.

The plant life affected with an over-abundance of saline will have indications of drought (wilted brown/yellow leaves); yet, water will be obviously present in the soil.

Even if the soil is damp, the plant cannot absorb the required water and nutrients due to the saline present, which is pulling the moisture from the roots, thus leading to dehydration.

How underdevelopment effects plant growth

When plants are exposed to too much salty water, they have a hard time completing the osmosis process. They spend too much energy playing tug of war with the salt, pulling in as much water as they can – in short, they have to fight for moisture.

Because of this, they put in lesser energy into making leaves formation and flowering; as a result, they may not produce or grow as well.

Can plants be watered with salt water?

Generally speaking, most plants can tolerate saltwater on their leaves and stems to an extent, but they will dehydrate if they drink saltwater from the soil. In some cases, plants may be poisoned by an excess of salt in their systems. The important thing to note is to avoid watering your plants with salt water if you want them to thrive because saltwater affects plant growth.

How much salt will kill a plant?

Generally speaking mix 1 cup of rock salt with 2 cups of water. Add it to a spray bottle or pour it directly over the plants you want to kill. Please use boiling water to dissolve the rock salt and kill the plants.