Applications and Roles of Magnesium Sulfate Heptahydrate Extruded Granules in Agriculture
Magnesium sulfate heptahydrate extruded granules, with their unique physicochemical properties and nutrient supply mode, have become a key nutrient source for improving crop quality and increasing yield. This granular fertilizer, formed through a special extrusion process, not only retains the natural nutritional activity of magnesium sulfate heptahydrate (MgSO₄·7H₂O) but also realizes the slow-release regulation of nutrients through the optimization of granular form, showing irreplaceable value in crop nutrition management and soil health maintenance.
It is a dual-element fertilizer. Both magnesium and sulfur are medium elements, which are essential for increasing crop yield and improving quality. It can be directly used as base fertilizer, topdressing, and foliar fertilizer, and can also be used as a component for blending. It is suitable for traditional agriculture, high-value-added agriculture, flower cultivation, and soilless culture and other fields.
It can adjust the pH value and physicochemical properties of the soil, improve soil fertility and the ability to retain water and fertilizer, and is conducive to the growth and development of crop roots.
Main Application Scenarios
Base fertilizer: Before sowing or transplanting, evenly spread the granules on the soil surface and then plow them into the soil. It is suitable for soils deficient in magnesium and sulfur, and can provide continuous nutrition for crops throughout the growth period, especially suitable for fruit trees, vegetables, field crops (such as corn, rice), etc.
Topdressing: In the middle growth period of crops (such as before flowering and during the fruiting period), supplementary application through furrow application, hole application, or broadcasting can quickly alleviate crop magnesium deficiency symptoms (such as leaf yellowing, interveinal chlorosis), and promote fruit enlargement or grain plumpness.
Foliar fertilizer: Dissolve the granules in water to prepare a solution with a certain concentration (usually diluted to 0.2%-0.5%) and spray it on crop leaves. It is suitable for emergency nutrient supplementation, especially when the root absorption capacity of crops decreases in the middle and late stages, it can be quickly absorbed by leaves to relieve nutrient deficiency symptoms.
Suitable Crop Types
Cash crops: Fruit trees (citrus, apple, grape, etc.), vegetables (tomato, pepper, cucumber, etc.), flowers, tea, etc., have high demands for magnesium and sulfur. After application, they can improve fruit quality (such as sweetness, hardness), extend the fresh-keeping period, and enhance the color and flowering period of flowers.
Field crops: Corn, rice, wheat, etc., can increase the 1000-grain weight and lodging resistance; oil crops such as rapeseed and soybean can promote oil synthesis.
Specialty crops: Tobacco (improves combustibility), potato (increases starch content), Chinese medicinal materials (improves the content of active ingredients), etc.
Soil Improvement
Regulating soil pH: For acidic soils, it can be used in conjunction with alkaline fertilizers to alleviate soil acidification; for alkaline soils, it can improve the aggregate structure and enhance the soil's ability to retain water and fertilizer.
Remediating degraded soils: Applying it in continuous cropping fields, saline-alkali soils, etc., can supplement the lost magnesium and sulfur elements, reduce the risk of soil compaction, and promote the activities of beneficial microorganisms.
Application Advantages
Good slow-release performance: The extruded granular form reduces nutrient loss caused by rapid dissolution of water, prolongs the fertilizer effect period, and improves the utilization rate (10%-20% higher than that of powdered magnesium sulfate).
Convenient application: The granular form is convenient for mechanical fertilization or manual broadcasting, not easy to cause dust, and reduces waste and environmental pollution.
Strong compatibility: It can be mixed with most nitrogen, phosphorus, and potassium fertilizers (avoid direct mixing with strongly alkaline fertilizers), which is convenient for preparing compound fertilizers and simplifies the fertilization process.
Precautions
Dosage control: Excessive application may lead to soil salt accumulation. The dosage should be determined according to soil test results and crop needs (generally, the base fertilizer dosage per mu is 5-20kg, and the topdressing dosage is 3-10kg).
Application timing: Avoid foliar spraying during high-temperature and strong light periods to prevent leaf burns; when used as base fertilizer, it needs to be fully mixed with the soil to avoid excessive local concentration.
Soil adaptation: It is easy to lose in sandy soil, so it needs to be applied in small amounts and multiple times; in heavy clay soil, the dosage can be appropriately increased, and combined with loosening the soil to improve absorption efficiency.
In conclusion, relying on its characteristics of comprehensive nutrition, convenient application, and long-lasting fertilizer effect, magnesium sulfate heptahydrate extruded granules have become an important choice in modern agriculture for improving crop yield and quality and improving soil, especially suitable for high-value-added agriculture and sustainable agricultural development needs.