What is drought stress
With global warming, drought stress makes most crops not mature properly and even causes yield reduction or cannot harvest. If the rate of water uptake by the roots of the crops is less than the rate of transpiration from the leaves, the crops will wilt. If there is no water in the soil that can be absorbed by the plant at this time, the crops will be permanently wilted, and if this state persists for too long, the plants will die.
Crop drought resistance namely is the characteristic that the crop can endure drought with the least damage and yield reduction. It is a kind of ability that crops to grow, reproduce, survive in an arid environment, and restore normal metabolism after drought.
Under drought conditions, the water crops lose is more than they absorb. Such water stress has a wide range of effects on crops, mainly influencing the crop's physiological and metabolic processes such as crop growth and development, photosynthesis, transpiration, and
respiration.
Under the condition of water stress, the cells in the plant undergo a series of adaptive changes in terms of physiology, biochemistry, structure, etc., and finally manifest in plant morphology and yield. Use drought-resistance agents to enhance crop resistance.
Effective Way to Improve Crop Drought Resistance
Drought resistance agent is a general term for chemical substances that can reduce evaporation or transpiration or enhance the drought resistance of crops when applied to the soil or crops.
One way to improve the drought resistance of crops is by using drought-resistant agents to enhance the adaption and resistance of crops to adversity. It is also an effective way to improve the drought resistance of crops and increase the yield of crops.
Types of Drought Resistant Agents
1. Biological Seed Dressing Agents: They contain rich crop cell membrane stabilizers, which strengthen the crop's drought resistance, delay emergency, promote seedling growth, increase green leaf area and dry matter accumulation, and improve individual quality. Ensure the maximum crop vitality, resist the adversity factors, and achieve the purpose of increasing production.
2. Fulvic Acid: The plant anti-transpiration agent which the main raw material is fulvic acid can effectively reduce the stomatal opening of plant leaves, reduce transpiration, increase the relative water content of leaves, promote root development, improve root vigor, and enhance root's ability to absorb water and nutrients, increase the content of chlorophyll and photosynthetic intensity, promote the absorption of nutrients and improve the utilization rate of fertilizers, increase the protective key enzymes of the cell membrane system, reduce the content of MDA and the relative conductivity of cell fluid. Thereby the damage of membrane lipids can be reduced and the drought resistance of crops can be improved. It has become one of the main drought-resistant agents widely used in production.
3. 6-BA & S-ABA: 6-BA enhances the crop's drought resistance by regulating the level of endogenous hormones, it can prevent the photosynthetic rate, chlorophyll content, and leaf water potential of crops from decreasing under water stress, thereby reducing the damage of reactive oxygen species to cell membranes under water stress. 6ba & aba mainly affect the drought resistance of crops by regulating endogenous hormones and are the main adaptive regulating substances produced in plants under drought conditions.
4. IBA & NAA: It is a plant growth regulator, also known as a rooting promoter which is broad-spectrum, high-efficiency, and non-toxic.
Its action mechanism mainly accelerates the germination of seeds, promotes the significant elongation of seed roots and the rapid expansion of leaf area, which is conducive to the formulation of a strong secondary root system, enhances the water retention capacity of plants, improves the drought resistance of crops, and achieves the effect of drought resistance, water saving and yield increase.
5.Glycine Betaine: It is an osmotic adjustment and drought resistance agent, the action mechanism of glycine betaine is to improve the metabolism of crops, increase the water content of the plant body, and maintain a longer green leaf functional period, thereby improving the drought resistance of crops, promoting grain filling and increasing crop yield.
6. Polymer water-absorbing resin: It is a soil water-retaining agent, and the capacity of water absorption can be 400 to 1200 times. It can form a "small reservoir" around the seed which contains auxin, providing essential water and growth substances for the germination and growth of seeds.
The soil water retaining agent can improve the soil structure, regulate soil water, heat, gas conditions, and water supply capacity, improve the soil fertility and the capacity of rainwater storage, enhance the capacity of root absorption and synthesis, maintain the normal physiological metabolism and photosynthetic production capacity of crops, and improve drought resistance.
7. Seaweed Extract: It contains rich seaweed polysaccharides, which can be absorbed by the crop's leaves easily. After the seaweed polysaccharides are absorbed by crops, it can increase the viscosity and elasticity of cell protoplasm, increase the concentration of cell fluid, improve the water absorption capacity and water retention capacity, and maintain the stability of hydrolase, protease, and lipase, so that the plasma membrane can be stabilized. The structure is protected from damage, thereby the drought resistance of the plant got improved. ( Omri Listed Seaweed Extract)
8. Salicylic acid: It can increase the content of free proline, POD activity, SOD activity, and the content of soluble protein, reduce MDA content, affect cell membrane permeability, and significantly improve plant drought resistance.