1、Using slow

Lignin-based slow-release fertilizers maintained litchi yield and improved quality. Use of slow-release fertilizers can reduce the nutrient inputs. Slow-release fertilizers application may achieve litchi sustainable production.

2、Effect of Application Ratio of Potassium over Nitrogen on Litchi Fruit

The appropriate appli-cation of potassium–nitrogen fertilizer can inhibit litchi fruit rotting and benefit the healthy fruit rate. The effect was more evident on the 4th to 6th day of storage and reflected good fruit storability.

3、RATE AND TIME OF POTASSIUM FERTILIZATION INFLUENCE YIELD AND QUALITY OF

The requirement of potassium in litchi is much higher compared with nitrogen and phosphorus. Autumn application of potassium is useful because it helped to reduce excessive vegetative growth, and increased flowering.

Litchi

In India litchi is grown mostly in the fertile belt and hence very little or no fertilizer is given. However, soil analysis should be done to determine the exact doses of fertilizer.

Effect of Application Ratio of Potassium over Nitrogen on

When K and N fertilizers were applied at the ratio of 1.2, litchi had a better fruit quality with higher vitamin C content, soluble sugar, and soluble solid. With the increase of K₂0:N ratio, healthy fruit rate initially increased and then decreased.

Best NPK fertilizer for litchi

Conservation fertilizer usually refers to a fertilizer applied after the litchi is picked, which can effectively prevent the premature aging of fruit trees, thereby increasing the yield of litchi.

How Much High Phosphorus Fertilizer to Use During Litchi Flowering Period?

During the attack period, quick-acting nitrogen, phosphorus and potassium fertilizers can be applied. However, after the last autumn shoot turns green, the soil fertilization should not be avoided.

Dynamic changes of nutrition in litchi foliar and effects of potassium

The following results were obtained. (1) The elemental contents of litchi leaves significantly varied during the different developmental stages.

EFFECT OF APPLICATION RATIO OF POTASSIUM OVER NITROGEN ON LITCHI GROWTH

The results showed that when K and N fertilizers were applied at the ratio of 1.0-1.2, litchi leaves had a higher photosynthetic rate, oxidation resistance and starch buildup, leading to better fruit size and quality with higher vitamin C content, soluble sugars, and so on.

Dynamic changes of nutrition in litchi leaves and effects of potassium

Litchi has the highest yield and benefit when the ratio of K2O to N ranges from 1.0 to 1.2. 【Conclusion】The ratio of K2O to N ranges from 1.0 to 1.2 is recommended for the main litchi production areas of China.

The young fruit stage of litchi is a critical phase in its growth, during which fruit development and nutrient accumulation are vital. Potassium fertilizers play a crucial role at this stage by promoting cell division, enhancing stress resistance, and improving fruit quality. Below is a detailed discussion on the types of potassium fertilizers, application methods, and precautions for litchi during this period:

I. Selection of Potassium Fertilizer Types

1. Water-Soluble Potassium Fertilizers

These fertilizers, typically in the form of potassium salts, are easily absorbed by plants. Common examples include:

• Potassium Sulfate: A widely used, cost-effective option with high absorption efficiency.
• Potassium Chloride: Moderately priced and suitable for certain soil types.
• Potassium Nitrate: Contains both nitrogen and potassium, satisfying dual nutrient needs, but is relatively expensive.

2. Slow-Release Potassium Fertilizers

These fertilizers release potassium gradually, reducing nutrient loss from single applications:

• Organic Fertilizers: Well-decomposed chicken manure, cow dung, or bone meal, which provide potassium along with organic matter.
• Compound Fertilizers: Mixtures of potassium with nitrogen, phosphorus, calcium, magnesium, etc., to meet diverse nutritional needs.

3. Micronutrient-Enhanced Potassium Fertilizers

These supplements combine potassium with essential micronutrients to improve overall plant health:

• Zinc Sulfate: Enhances disease resistance and promotes flower bud differentiation.
• Manganese Sulfate: Stimulates photosynthesis and improves fruit quality.
• Iron Sulfate: Supports growth and increases fruit yield.

II. Application Methods

1. Basal Application

Spread potassium fertilizer evenly over the soil surface after plowing, then incorporate it into the soil. Suitable for large orchards to ensure uniform distribution.

2. Topdressing

Apply fertilizer based on tree growth and soil conditions. Combine potassium with appropriate nitrogen and phosphorus fertilizers to optimize nutrient uptake. Avoid overapplication to prevent root burn.

3. Foliar Spraying

For acid-loving litchi varieties, apply potassium directly to leaves via spraying. This method bypasses soil absorption, increasing efficiency. Conduct spraying on sunny days, controlling dosage and frequency.

III. Precautions

1. Soil Conditions: Adjust fertilizer type based on soil pH and nutrient content. Acidic soils often benefit from high-potassium formulations.
2. Dosage: Determine amounts based on tree size, age, and growth stage. Over- or under-application may harm growth. A typical recommendation is 5–10 kg per mu (~0.067 hectares).
3. Timing: Apply before spring budbreak when nutrient demand is high. Avoid hot summer periods to prevent nutrient loss and root damage.
4. Nutrient Balance: Coordinate potassium with nitrogen, phosphorus, calcium, and magnesium to ensure comprehensive nutrition. For example, pair nitrogen applications with increased potassium.
5. Environmental Factors: Consider weather and soil moisture. Increase irrigation during droughts to aid absorption. Avoid fertilizing immediately after rain to prevent runoff and root diseases.
6. Pest Control: Excessive fertilization can disrupt soil balance and trigger pests/diseases. Monitor trees closely and address issues promptly.
7. Crop Rotation: Use rational rotation to prevent soil nutrient depletion and maintain soil structure.
8. Organic Integration: Incorporate organic fertilizers to enrich soil organic matter, enhance water retention, and promote beneficial microbial activity.
9. Scientific Application: Follow principles of balanced, efficient, and safe fertilization. Avoid over-reliance on single nutrients.
10. Monitoring & Adjustment: Regularly test soil nutrients and observe tree health. Calibrate strategies based on data to ensure optimal results.

the young fruit stage is critical for litchi growth. Selecting appropriate potassium fertilizers, combined with scientific application and meticulous management, significantly enhances fruit quality and yield. Adjust practices according to soil, tree needs, and economic factors to maximize benefits.