How Much Magnesium Fertilizer to Apply Per Mu

1、Magnesium sulfate is used as a leaf fertilizer procedure

Applying magnesium fertilizer to the soil, the appropriate amount of magnesium sulfate per mu is 10-13 kg, and reduced magnesium is 1-1.5 kg per mu. After a full application, it can be applied after several crops, and it is not necessary to apply every season.

Magnesium sulfate is used as a leaf fertilizer procedure

2、MAGNESIUM

A suggested application rate for magnesium sulfate heptahydrate (Epsom Salts) or magnesium nitrate in fertigation programs is 25 - 30 kg/ha per application. Three or more applications may be required at fortnightly intervals during peak growth periods.

3、Calculate Magnesium Application

Please refer to our Application Guide which provides fertility programs for various crops. Magnesium (Mg) usually appears on soil test reports as parts per million (ppm) Mg.

4、How to Use Magnesium Sulphate Fertilizer? Boost Soil Health Naturally

A: Recommended application rates for magnesium sulphate fertilizer vary depending on soil type, crop growth stage, and magnesium levels. Typically, application rates range from 10-50 kg/ha, with adjustments made based on soil test results and crop response.

How to Use Magnesium Sulphate Fertilizer? Boost Soil Health Naturally

Choosing a Magnesium Fertilizer for Pasture and Hay Fields

The purpose of this paper is to compare the economics, ease of application and availability of five magnesium amendments in West Virginia. The usual recommendation to increase magnesium levels is to apply dolomitic lime, which typically has an elemental magnesium level around 10%.

Magnesium Sulphate Horticultural Grade

Exact dosages, concentration and application stage are subject to local conditions, use of other fertilizers and can only be given after an objective diagnosis.

Magnesium sulfate: plant fertilizer application and composition

Normal application of dry granules of magnesium sulfate (in g. per sq. m) for vegetable crops: potatoes - 15-20.

Types of Magnesium Fertilizers and Application Methods。

The appropriate amount of magnesium sulfate per mu is 10-13 kg per mu to the soil, which is 1-1.5 kg per mu of pure magnesium; after a full application, it can be applied in several crops, not every season.

Fertilising with magnesium

To prevent magnesium deficiency, annual maintenance fertilisation of approx. 50 to 100 grammes of Epsom salt per square metre is recommended – on lighter soils normally add the higher quantity and on heavier soils the lower quantity.

How to Add Magnesium in Soil?

Apply magnesium at the recommended rates, typically 1-2 pounds per acre, to avoid over-fertilization and potential environmental harm. Combine magnesium with other essential nutrients, such as sulfur and potassium, for enhanced plant growth and development.

In agricultural production, the rational application of fertilizers is one of the key factors for improving crop yield and quality. As an essential microelement fertilizer, magnesium fertilizer requires detailed explanation regarding its application methods, dosages, and precautions. Below is a detailed analysis of magnesium fertilizer application for one mu (0.0667 hectares) of land:

I. Types and Characteristics of Magnesium Fertilizers

1. Types of Magnesium Fertilizers

Magnesium Sulfate: A common inorganic magnesium fertilizer formed by combining sulfate ions with magnesium ions. It is suitable for various soils and crops and can be rapidly absorbed by plants.
Magnesium Chloride: This fertilizer exists in chloride form, with high solubility and penetration, making it ideal for irrigation fertilization.
Magnesium Carbonate: Typically found in carbonate form, it provides slow-release magnesium, suitable for scenarios requiring long-term stable magnesium supply.

2. Characteristics of Magnesium Fertilizers

High Effectiveness: The magnesium in these fertilizers can be directly absorbed by crops, playing a critical role in promoting growth and stress resistance.
Safety: Non-toxic to the environment or human health.
Significant Yield Increase: Proper application improves crop yield, quality, and disease resistance.
Versatility: Suitable for all soil types and crops, with dosages adjustable based on crop needs and soil conditions.

II. Application Methods and Techniques for Magnesium Fertilizers

1. Timing of Application

Base Application: Applied before sowing or transplanting as a foundational fertilizer to ensure continuous magnesium supply throughout the crop’s lifecycle.
Topdressing: Applied during the growing season based on crop nutrient demands and soil conditions. Avoid overapplication to prevent waste or adverse effects.
Foliar Spraying: For magnesium-loving crops (e.g., wheat, rape), foliar spraying can enhance photosynthetic efficiency and yield. use cautiously to avoid damage or growth disruption.

2. Dosage

Determining Dosage: Consider soil test results, crop requirements, and local climate. Generally, apply 5–10 kg/mu of magnesium sulfate, 10–20 kg/mu of magnesium chloride, or 10–20 kg/mu of magnesium carbonate.
Proportioning: Prioritize higher-concentration magnesium fertilizers (e.g., sulfate or chloride) before lower-concentration ones (e.g., carbonate) to ensure optimal absorption.

3. Application Techniques

Deep Placement: Apply magnesium fertilizers 20–40 cm deep to reduce runoff and improve efficiency.
Uniform Distribution: Ensure even spread using fertilizer machines or manual broadcasting. Avoid direct contact with crop roots to prevent damage.
Combine with Other Fertilizers: Mix magnesium fertilizers with nitrogen, phosphorus, or other nutrients to balance nutrient supply. Monitor compatibility to avoid interactions.
Safety Precautions: Wear gloves, masks, and protective gear to avoid skin/eye contact or inhalation of dust/fumes.

III. Precautions for Using Magnesium Fertilizers

1. Soil Conditions

Soil pH: Acidic soils favor high-magnesium fertilizers, while alkaline soils require lower-magnesium options. Test soil pH before application.
Soil Texture: Clay soils retain moisture but may leach magnesium, while sandy soils risk nutrient loss. Adjust fertilizer type and method accordingly.
Soil Nutrients: Supplement magnesium if soil lacks essential elements, but avoid overapplication to prevent imbalance.

2. Crop Requirements

Crop Type: Magnesium-intensive crops (e.g., wheat, corn) need higher doses, while legumes or tubers require less.
Growth Stage: Apply more magnesium during rapid growth phases to support photosynthesis and nutrient synthesis. Reduce during early stages due to weak root absorption.
Disease Management: Moderate magnesium application strengthens cell walls and disease resistance, but avoid excess to prevent toxicity.

3. Environmental Factors

Climate: In hot, dry conditions, increase magnesium to offset reduced absorption. In rainy weather, limit application to prevent runoff.
Soil Moisture: Maintain adequate soil humidity for optimal absorption, especially in dry soils.
Pesticide Compatibility: Check for reactions between magnesium fertilizers and pesticides, as some mixtures may form insoluble compounds.

Rational magnesium fertilization is vital for boosting crop yields and quality. Determine dosages and methods based on soil conditions, crop needs, and environmental factors. Prioritize safety and environmental protection to maximize benefits while minimizing pollution. Scientific application of magnesium fertilizers unlocks their full potential for agricultural productivity and crop improvement.