1、Estimating thresholds of nitrogen, phosphorus and potassium fertilizer

This study proposed a systematic method for estimating the optimum ranges of N, P and K fertilizer for rice cultivation in China, which hinges on dual principles: nutrient balance and rice yield levels.

2、Potassium fertilizer management on rice cultivation. Journal of

Based on the two strong investigations, yield, yield components and nutrient use efficiency were responded to different application time of potassium fertilizer. T6 (½ potash applied at...

3、Potassium fertilizer management improves rice yield by

In this study, a two-factor split-plot experiment was conducted in Sichuan, China, to evaluate the influence of K management methods on the morphological and physiological characteristics of leaves and grain yield under shading stress.

4、Enhancing Rice Production by Potassium Management: Recommended

The relationship among rice yield, biomass accumulation and plant K uptake, and recommended reasonable K fertilizer application rates in different inherent soil productivity levels were evaluated.

Optimal Potassium Fertilizer Application for Rice Fields

The purpose of the present study was to evaluate the effect of potassium on growth and yield of rice and to find out the best suited scheme/timing of potassium fertilizer application for rice crop.

Characteristics of Potassium Utilization and Crop Yield Formation in

Compared with K 0, K application significantly increased rice and rapeseed yield by 18.1%-32.7% and 46.7%-93.1%, respectively, and K uptake by 72.3%-240.1% and 124.6%-512.2%, respectively.

Nitrogen, phosphorus, and potassium fertilization affects the flowering

Five gradients of nitrogen (N), phosphorus (P) and potassium (K) fertilizer were set respectively to study the effects of nutrients on rice flowering time and flowering duration.

Optimizing rice yield, quality and nutrient use efficiency through

This study was expected to provide a theoretical basis for the optimization and improvement of cultivation methods to achieve high yield, high quality, and reduce fertilizer input for rice production in southwest China, as well as the large-scale promotion and application of this cultivar.

Synergistic role of potassium fertilizer and kinetin in mitigating iron

It appears that potassium deficiencies in rice fields may exacerbate iron toxicity; as a result, using K fertilizers raises the concentration of potassium ion (K +) in plants, reducing iron...

(PDF) Effects of Different Potassium (K) Fertilizer Rates on Yield

Present study was conducted in three different sites in South China in late season in 2019 with the objective to study the effects of different applied amounts of K fertilizer on yield formation...

In rice cultivation in cold regions, the application of potassium fertilizer is one of the key factors for improving yield and enhancing quality. Potassium fertilizer not only promotes plant growth and development but also strengthens the crop’s resistance to diseases and pests, while contributing to better rice quality. Below is a detailed introduction to the usage methods, dosage, and precautions for potassium fertilizer in cold-region rice farming.

I. Selection and Classification of Potassium Fertilizers for Cold-Region Rice

1. Choosing Suitable Potassium Fertilizer Varieties

• Potassium Nitrate (KNO₃): Suitable for most rice varieties, cost-effective, and easily absorbed by soil.
• Potassium Sulfate (K₂SO₄): Ideal for acidic soils, as it increases soil pH and reduces disease incidence.
• Potassium Chloride (KCl): Appropriate for neutral or slightly alkaline soils, providing stable nutrient supply.

2. Understanding the Characteristics of Different Potassium Fertilizers

• Potassium Nitrate: Fast-acting, suitable for topdressing to rapidly elevate soil potassium levels.
• Potassium Sulfate: Slow-release, suitable for base fertilization to ensure steady potassium supply over time.
• Potassium Chloride: Gradual release, ideal for base fertilization to prevent nutrient excess from topdressing.

II. Application Methods for Potassium Fertilizer

1. Base Fertilization

• Depth: Apply within the tillage layer (0–20 cm) to ensure even distribution and root absorption.
• Dosage: Determined by soil tests and target yields, typically 10–20 kg per mu.

2. Topdressing

• Timing: Apply during critical growth stages, such as tillering, booting, and heading, to support rice development.
• Dosage: Adjust based on rice growth and soil conditions, usually 15–30 kg per mu.

3. Foliar Spraying

• Timing: Use during key periods (tillering, booting, heading) to improve potassium utilization efficiency.
• Method: Dissolve potassium fertilizer in water and spray uniformly over leaves using a fogging nozzle. Avoid overspray to prevent phytotoxicity.

III. Dosage Control for Potassium Fertilizer

1. Adjust Based on Soil Conditions

• Soil Type: Increase dosage in acidic soils to raise pH; reduce dosage in alkaline soils.
• Soil Fertility: Lower dosages for high-fertility soils; higher dosages for low-fertility soils.

2. Adjust Based on Climate

• Arid Regions: Increase dosage to meet water-related demands.
• Humid Regions: Reduce dosage to minimize nutrient runoff and waste.

3. Coordinate with Other Fertilizers

• N-P-K Balance: Combine potassium with nitrogen and phosphorus fertilizers to enhance efficiency.
• Micronutrient Synergy: Pair potassium with iron, manganese, etc., to boost micronutrient uptake.

IV. Precautions for Using Potassium Fertilizer

1. Avoid Overapplication

• Seedling Damage: Excess potassium can burn rice leaves, disrupting photosynthesis.
• Nutrient Imbalance: Overuse may deplete other essential soil nutrients.

2. Coordinate with Other Fertilizers

• Avoid Sole Application: Mix potassium with nitrogen, phosphorus, or organic fertilizers to optimize results.
• Separate from Pesticides: Apply potassium fertilizer separately from pesticides to avoid reduced efficacy.

3. Environmental Protection

• Prevent Water Pollution: Properly manage salty runoff from potassium fertilizers.
• Avoid Soil Salinization: Long-term excessive use may lead to soil structure degradation and salinization.

potassium fertilizer plays a vital role in improving yield and quality for rice in cold regions. By selecting appropriate fertilizer types, applying scientific methods, controlling dosages rationally, and adhering to precautions, farmers can maximize the benefits of potassium fertilizer and achieve high-quality, high-yield rice production in cold environments.