The effect of seaweed extract on crops and its mechanism
The wonderful growth-promoting and anti-stress effects of seaweed extracts on crops have been continuously confirmed in a large number of practices. A large number of experiments have shown that seaweed extracts can increase crop yields, improve the quality of agricultural products, and enhance the ability of crops to resist drought, cold and disease, and can significantly reduce the accumulation and residue of pesticides and fertilizers in vegetables.
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YUEXIANG
The mechanism of seaweed extract improving drought resistance of crops
Seaweed extracts are rich in seaweed polysaccharides, which are easily absorbed by crop leaves. After these seaweed polysaccharides are absorbed by crops, they can increase the viscosity and elasticity of cell protoplasm, increase the concentration of cell fluid, increase water absorption capacity and water retention capacity, and maintain the stability of hydrolytic enzymes, proteases and lipases, thereby making the plasma membrane The structure is protected from damage, thereby improving the drought resistance of the plant.
The mechanism of seaweed extract in reducing nitrate accumulation in vegetables
Different concentrations of seaweed extracts can significantly reduce spinach nitrate content and enhance nitrate reductase activity, and the concentration has a linear negative correlation with nitrate content and a linear positive correlation with nitrate reductase activity. This shows that the seaweed extract reduces the nitrate content of spinach by enhancing the activity of nitrate reductase. Under the action of nitrate reductase, it converts nitrate into amino acids or proteins, and promotes the conversion or metabolism of nitrate accumulated in spinach.
Seaweed extract significantly improves vegetable quality
Seaweed extract can increase the dry matter content of pepper by 13.8%, soluble sugar content by 4.1%, and VC content by 23.3%; it can reduce carrot soluble sugar content by 1.3%, VC content by 11.8%, and carotene content by 45.0%. Carotene content increased by 29.2%, Fe content decreased by 18.9%, while carotene and carotenoids mainly affect the color of fleshy roots, which indicates that seaweed extract mainly improves the appearance quality (color) of carrots; it can reduce the crude celery fiber 6.6%, VC content increased by 10.4%; tomato organic acid content increased by 11.3%, soluble solids increased by 26.7%, VC content increased by 12.2%. Seaweed extract has a significant effect on improving the quality of vegetables.
The effect and mechanism of seaweed extract on tomato virus disease
Seaweed extract has a significant control effect on tomato virus disease. At the same time, kelp extract can enhance SOD enzyme activity, increase chlorophyll content and healthy seedling index, and the concentration has a significant positive correlation with SOD enzyme activity and healthy seedling index. It shows that seaweed extract can prevent tomato virus disease by improving enzyme activity and increasing plant resistance.
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