1、Method development and validation for the determination of potassium

Fertilizer samples are tested for determining their nutrient contents; however, different methods give varying results. Therefore, the major objective of this study was to develop and validate potassium determination method by flame photometry technique.

2、全钾与氧化钾的换算方法详解

在土壤分析和植物营养研究中，全钾（Total Potassium, K）和氧化钾（Potassium Oxide, K₂O）是两个重要的参数。 它们之间的换算对于准确评估土壤中的钾含量以及制定合理的施肥计划至关重要。

3、Potassium for Sustainable Agriculture

Potassium is also named as a quality element because it improves the agricultural-product quality. Potassium also develops resistance against different environmental stresses and has ability to mitigate biotic and abiotic stresses developing immunity in the plants.

4、K2o

In the agricultural sector, K₂O is the primary way manufacturers represent the potassium content in fertilizers. The percentage of K₂O listed on a fertilizer label doesn't mean that the fertilizer actually contains K₂O.

5、Potassium Fertilizers for Crop Production

Analyses of potassium fertilizers are typically reported as percent K2O (potassium oxide), a potassium form that is not actually present in fertilizers, but is used as an industry standard measure. In a standard fertilizer analysis, the third number is the percent of K2O by weight in the fertilizer.

Potassium and Chloride in Crops and Soils: The Role of Potassium

Potassium chloride (KCl), known also as muriate of potash (MOP), is the most widely used source of potassium for agricultural crops. Throughout this book we will use the abbreviation 'KCl' and reserve the term 'potash' for K2O as used frequently in statistics of fertilizer use.

Potassium in agriculture – Status and perspectives

In this review we summarize factors determining the plant availability of soil potassium (K), the role of K in crop yield formation and product quality, and the dependence of crop stress resistance on K nutrition.

Method development and validation for the determination of potassium

Background Fertilizer samples are tested for determining their nutrient contents; however, different methods give varying results. Therefore, the major objective of this study was to develop and...

NPKGRIDS: a global georeferenced dataset of N, P

Development of NPKGRIDS adopted a data fusion approach to integrate crop mask information with eight published datasets of fertilizer application rates, compiled from either georeferenced data or...

Potassium Fertiliser

The quality or grade of potassium fertilisers is expressed as a percentage of potassium oxide (K2 O) equivalent. The main potassium fertilisers used in agriculture are: Muriate of potash (potassium chloride). As now scslold, it usually contains 60% K 2 O.

Agricultural potassium oxide fertilizers, typically referring to those containing potassium oxide (K₂O) as the primary nutrient, play a critical role in improving crop yield and quality. Below are key methods to evaluate their quality:

1. Visual Inspection

• Packaging: Check for intact, undamaged packaging with no signs of leaks.
• Color: Uniform color is ideal; yellowish or grayish-white hues may indicate insufficient K₂O content.
• Particle Size: Consistent particle size suggests proper processing; irregular sizes may signal defects.

2. Component Analysis

• K₂O Content: Verify the stated percentage (e.g., 50% K₂O means 50g of K₂O per 100g fertilizer).
• Additional Nutrients: Check for secondary nutrients (e.g., nitrogen, phosphorus) and microelements.

3. Solubility Test

• Dissolve a small sample in water. Rapid and complete dissolution indicates good solubility, aiding plant absorption.

4. pH Testing

• Use pH strips or a meter to measure acidity. High-quality K₂O fertilizers typically show slight acidity to neutrality; extreme pH levels may harm crops.

5. Thermal Stability

• Heat the fertilizer briefly. Quality products resist caking, discoloration, or degradation under high temperatures.

6. Physical Properties

• Hardness: Firm texture often correlates with better quality.
• Impurities: Avoid fertilizers with unburned carbon, metal fragments, or other contaminants.

7. Safety Assessment

• Look for safety labels (e.g., "hygroscopic," "corrosive").
• Discard expired or compromised products (e.g., moldy, caking).

8. User Reviews & Brand Reputation

• Research user feedback and market reputation. Established brands often adhere to stricter quality controls.

9. Certifications & Test Reports

• Ensure compliance with certifications (e.g., organic, non-GMO). Third-party test reports validate K₂O content and purity.

10. Price Comparison

• While cost isn’t the sole metric, competitively priced fertilizers with consistent quality are preferable. Cross-reference prices with the above criteria.

By systematically evaluating these factors, farmers can make informed decisions to select high-quality potassium oxide fertilizers, optimizing agricultural productivity and sustainability.