1、Improvement of the Field Productivity in Rehmannia glutinosa Libosch

The present study aimed to assess the influence of nitrogen (N), phosphorus (P) and potassium (K) fertilizers on the catalpol content of Rehmannia glutinosa roots sown under divergent plant spacing.

2、(PDF) Improvement of the Field Productivity in Rehmannia glutinosa

PDF | On Jun 15, 2020, Thanh Loan Pham and others published Improvement of the Field Productivity in Rehmannia glutinosa Libosch.

3、Comparing Different Forms of Potassium Fertilizers for Gardens

In this article, we will explore the most common potassium fertilizers used in gardening, compare their characteristics, benefits, drawbacks, and best application practices. By the end, you should have a clearer idea of which potassium fertilizer suits your garden’s needs best.

4、The Effect of Ratio Nitrogen, Phosphorus and Potassium Fertilizer on

The Effect of Ratio Nitrogen, Phosphorus and Potassium Fertilizer on Yield and Quality of Rehmannia Glutinosa F.hueichingensis

Effects of potassium fulvic acid and potassium humate on microbial

In summary, our study demonstrated that the addition of BSFA and KHM increased the nutrients in the ginseng soil and reshaped the microbial function in soils, providing a theoretical foundation for soil improvement and biological control of ginseng diseases.

Meta

Compared with the appropriate K fertilizer application rate, the unreasonable K fertilizer application would result in the decrease of quality growth rate; and the improvement effect of K-sulfate on crop quality was better than that of K-chloride on average.

Potassium Fertilizers

In this comprehensive guide, we’ll explore everything you need to know about potassium fertilizers, including their types, uses, application methods, and how to choose the right one for your garden or farm.

Rehmannia (Rehmannia glutinosa) Care Guide: Pests, Diseases, Watering

For liquid fertilizers, 2ml per liter of water is suitable for maintaining healthy growth. For solid fertilizers, 50 grams per square meter applied evenly over the soil surface provides necessary nutrients without risking excessive accumulation.

Frontiers

Fertilization scheme N3P1K3, with N fertilizer at 50 g·m−2, P fertilizer at 15 g·m−2, and K fertilizer at 60 g·m−2, had the most comprehensive benefit and significantly increased ginseng rhizome biomass and ginsenoside contents (Rg1, Re, Rf, Rg2, Rb1, Ro, Rc, Rb2, Rb3, Rd).

Understanding potassium fertilizers: Their role and benefits in plant

These fertilizers are chemicals such as potassium chloride (KCl) and potassium sulfate that provide sufficient potassium to the plant for maximum growth. Soils are generally more fertile in K than N and P, but not inexhaustible due to substantial mining.

In the process of planting Rehmannia (also known as ginseng), the use of potassium fertilizer is one of the key factors in improving soil quality, crop yield, and product quality. Potassium fertilizer not only helps promote plant growth but also improves soil structure, enhances root health, and increases the crop's resistance to pests and diseases. Below is a detailed discussion on the use of potassium fertilizer for growing Rehmannia:

I. Selection and Importance of Potassium Fertilizer

1. Choosing the Right Type of Potassium Fertilizer

• Common types of potassium fertilizers on the market include potassium chloride, potassium sulfate, and potassium nitrate. Among these, potassium chloride is cost-effective and suitable for large-scale cultivation, while potassium sulfate and potassium nitrate are more appropriate for crops requiring higher potassium content, such as Rehmannia.
• When selecting potassium fertilizer, soil pH and the specific needs of the crop should be considered. For example, if the soil is acidic, potassium sulfate or potassium nitrate can be chosen to neutralize the acidity.

2. Mechanism of Potassium Fertilizer

• Potassium is essential for plant growth, as it regulates water balance, photosynthesis, cell wall formation, and nutrient transport within plants.
• Potassium fertilizers also promote root development, enhance adaptability to drought and saline conditions, and improve the overall stress resistance of crops.

3. Relationship Between Potassium Fertilizer and Crop Yield

• Appropriate application of potassium fertilizer can significantly increase the yield and quality of Rehmannia. Studies show that potassium fertilizer enhances the weight per plant, total yield, starch content, and taste of Rehmannia.
• Potassium fertilizer also strengthens the antioxidant capacity of Rehmannia, delays senescence, and extends shelf life.

II. Application Methods and Precautions for Potassium Fertilizer

1. Timing and Methods of Fertilization

• Potassium fertilizer for Rehmannia is typically applied as base fertilizer before planting or as a topdressing during the growth period. For base fertilization, spread the fertilizer evenly on the soil surface and then deeply incorporate it into the soil. For topdressing, adjust the amount and frequency based on crop growth and soil test results.
• To ensure effective absorption, foliar spraying or soil drenching is recommended. These methods reduce direct contact between fertilizer and soil, preventing root burn from excess accumulation.

2. Controlling Fertilizer Amount

• Determine the appropriate amount of potassium fertilizer based on soil tests and crop requirements. Generally, 5–10 kg of potassium chloride per mu is recommended. Overapplication may lead to rapid growth at the cost of quality, while insufficient application may result in poor yield and quality.
• Considering Rehmannia’s long growth cycle, apply more potassium during early and mid-growth stages to support rapid development. Reduce the amount after harvest to aid soil recovery for the next planting season.

3. Post-Fertilization Management

• After fertilization, loosen the soil and ensure proper drainage to facilitate potassium dissolution and root respiration.
• Monitor crop growth and soil moisture. Adjust strategies if needed. For example, if growth slows or signs of potassium deficiency appear, increase potassium application or take supplementary measures.

III. Relationship Between Potassium Fertilizer and Soil Improvement

1. Improving Soil Structure

• Potassium fertilizer enhances soil structure and texture, improving water retention and aeration. This is critical for shallow-rooted crops like Rehmannia, as better soil structure aids water and nutrient absorption.
• Proper potassium application also promotes soil microbial activity, further improving the soil environment.

2. Regulating Soil pH

• The sulfur in potassium sulfate reacts with calcium in the soil to form insoluble calcium sulfate, reducing soil pH. This helps balance soil acidity for optimal Rehmannia growth.
• excessive use of sulfur-containing fertilizers may disrupt soil nutrient supply. Follow moderation principles and combine with other fertilizers when using sulfur-based potassium products.

Potassium fertilizer plays a vital role in Rehmannia cultivation. By selecting the right type, applying scientifically, and managing post-fertilization practices, farmers can significantly improve crop quality and yield. Additionally, potassium fertilizer helps optimize soil structure and pH, creating favorable conditions for Rehmannia growth. careful selection and management of potassium fertilizer are essential for achieving high-quality, high-yield Rehmannia production.