1、Foliar spraying of potassium sulfate during fruit development

Potassium sulfate (K2 SO 4) is the best source for potassium supplementation to improve citrus fruit quality. Six-time K 2 SO 4 foliar application throughout fruit development noticeably increased the fruit quality, specifically sugar accumulation.

2、How potassium fertilizer unlocks the secret to sweeter citrus

For citrus growers, the study delivers clear, actionable guidance: aim for around 1.5% potassium in fruit pulp and time fertilization to coincide with the color-turning stage, when sugar...

3、OPTIMIZATION OF NEW GENERATION POTASSIUM (NG

Comparing traditional K fertilizer, i.e., sulfate of potash (SOP), with new-generation potassium (NG-K) employed the use of foliar and soil (basal) applications.

[Optimized nutrients management improved citrus yield and

Among different optimized fertilization methods, the effect of optimized NPK + medium and/or micro element fertilizer on citrus yield and fruit quality was the best, especially NPK decrement ≤25% between optimized NPK measures.

Managing Citrus Fertilization with Potassium

Potassium fertilizer, as a key nutrient source, profoundly impacts citrus growth, fruit quality, and yield. Below is a detailed guide on managing potassium fertilization:

PDF: OPTIMIZATION OF NEW GENERATION POTASSIUM (NG

The conducted field experiment assessed the impact and response of different levels of K applications on the quality and yield parameters of citrus fruit, determining a suitable time, stage, and K fertilizer dose for citrus trees.

Which Foliar Fertilizers Are Better for the Citrus Fruit Coloring Stage?

The citrus fruit coloring stage is a critical transition period from green to yellow, and eventually to red peel. This phase is vital for tree growth and fruit quality.

Optimized nutrients management improved citrus yield and fruit quality

Among different optimized fertilization methods, the effect of optimized NPK + medium and/or micro element fertilizer on citrus yield and fruit quality was the best, especially NPK decrement ≤25% between optimized NPK measures.

Foliar Nourishment with Different Potassium Sources to

This study systemically evaluated the potential effects of different foliar-applied potassium-based fertilizers on the yields of lemon trees grown in potassium-deficient soils. The fertilizers were applied to improve the absorption of nutrients and enhance physiological performance.

Potassium Fertilization in Citrus Orchards

This study was conducted to evaluate potassium fertilization management on citrus orchards as an effort to gain a better understanding of the potassium requirement, amount of fertilization, and proper timing of potassium application as well as potassium uptake and transfer in citrus trees.

The coloring stage of citrus fruits is a critical phase in fruit maturation, during which the demand for potassium fertilizer increases. Potassium enhances fruit quality, storage life, and overall yield. Selecting the right potash fertilizer is essential for healthy citrus growth and development.

I. Understanding Citrus Needs for Potassium

1. Roles of Potassium Fertilizer:

   • Enhances stress resistance (drought, cold, pests, and diseases).
   • Regulates enzyme activity, influencing photosynthesis, respiration, and nutrient transport.
   • Promotes root development, improves water/nutrient absorption, and prevents soil compaction.
   • For citrus: Improves fruit coloration, sugar content, and taste.

2. Potassium Requirements of Citrus:

   • Lower potassium needs during early growth; demand peaks during the coloring stage.
   • Late-maturing varieties generally require more potassium than early-maturing ones.

II. Selecting the Right Type of Potassium Fertilizer

1. Potassium Sulfate:

   • Fast-acting and suitable for acidic soils.
   • Avoid overuse to prevent soil salinization.

2. Potassium Chloride:

   • Cost-effective but may cause chlorosis in sensitive crops; use cautiously.

3. Potassium Nitrate:

   • Slow-release formula, ideal for topdressing or base fertilization.
   • Improves soil water retention and fertilizer efficiency.

4. Wood Ash:

   • Organic source of potassium; use as base or topdressing fertilizer.
   • Avoid excessive application to prevent root burn.

5. Phosphate-Potassium Compound Fertilizer:

   • Combines phosphorus and potassium; suits citrus’s dual nutrient needs.
   • High solubility and absorption rate; ideal for topdressing.

III. Timing and Methods of Application

1. Timing:

   • Apply during fruit expansion (pre-coloring stage) when potassium demand is highest.
   • Adjust based on local climate and soil conditions; typically apply in late autumn to early winter.

2. Methods:

   • Soil Type: Use ditch/hole application for sandy soils; ring/strip application for clay soils.
   • Dosage: 20–30 kg/mu of potassium sulfate compound fertilizer or potassium chloride, adjusted for tree age, soil fertility, and weather.

IV. Key Considerations

1. Avoid Overapplication:

   • Excess potassium can cause root/leaf burn and resource waste. Follow recommended rates.

2. Balanced Nutrient Coordination:

   • Pair with nitrogen, phosphorus, and other fertilizers for balanced nutrition.
   • Beware of interactions (e.g., excessive nitrogen may counteract potassium uptake).

3. Environmental Factors:

   • Adjust for rainfall and temperature to prevent runoff or root damage. Reduce frequency/dosage in hot, rainy seasons.

proper potassium management during the citrus coloring stage is vital for fruit quality and yield. By choosing suitable fertilizers, timing applications correctly, and avoiding common pitfalls, growers can ensure healthy trees and premium fruit production.