1、Potassium Fertilizer Recommendations

Quick reference tables, rounded to the nearest 5 pounds, are provided for corn, soybean, wheat, corn silage, and alfalfa for potassium below. Potassium recommendations differ for sandy soil (CEC <5 meq/100g) and loam and clay soils (CEC >6 meq/ 100g).

2、Potassium Guidelines for Corn

Potassium can accumulate to very levels in heavily manured corn fields. This K can be used by the next crop in the rotation. If K is needed, starter N+K2O should be limited to no more than 80-100 lbs/acre in the fertilizer band to prevent salt injury. Potassium fertilizer can be broadcast separately as well. Cornell Nutrient Analysis Laboratory.

3、How Much Fertilizer Do I Need to Apply for My Corn Crop?

First, crop fertility needs vary depending on the nutrient. Nitrogen (N) availability and the amount needed to grow a corn crop is vastly different than for phosphorus (P) or potassium (K) which are all primary crop nutrients.

How many chemical fertilizers are used in one mu of corn? what's the

For fields with a yield level of 400-600 kg / mu, 12-14 kg / mu of nitrogen fertilizer, 3-5 kg of phosphate fertilizer, 1-5 kg / mu of potash fertilizer, 1 kg / mu of zinc sulfate and 0.5 kg / mu of borax are recommended.

Phosphorus and Potassium Fertility for Corn and Soybean

Nutrient sufficiency recommendations are designed to provide 90 to 95% of maximum yield and a high rate of return per unit of fertilizer applied. Build and maintain recommendations are designed to provide 100% of maximum yield with low risk of yield loss due to insufficient fertility.

How Much Fertilizer for 1 Acre of Corn? – Northern Homesteading

Corn fields have a base fertilizer application of 200 pounds of nitrogen, 100 pounds of phosphorus, and 170 pounds of potassium per acre. The practical application rate goes up or down from there depending on soil texture, amount of water, and the soil’s natural fertility rates.

Fertilizer Suggestions For Corn, G74

Generally the soil can supply adequate amounts of potassium, sulfur, zinc, and iron, but on some soils the corn crop will benefit from applying one or more of these nutrients.

Corn Fertilizer Recommendation

Growers traditionally use small amounts of Nitrogen and Phosphorus as a starter fertilizer for corn furrows. Researchers found potassium effective as a starter phase.

How Much Fertilizer Do I Need for Corn?

Determining the optimal fertilizer amount for corn is a multifaceted process that involves considering various factors such as soil type, corn variety, climate, and crop rotation.

How Much Fertilizer Is Needed Per Acre Of Corn

Typical fertilizer applications include 200 pounds of nitrogen, 100 pounds of phosphorus, and 170 pounds of potassium per acre, adjusted based on soil characteristics. Studies suggest that for corn after soybeans, an economically optimal nitrogen rate lies between 127 to 147 pounds per acre.

For one mu of land (approximately 667 square meters) planted with corn, the appropriate amount of potassium fertilizer depends on multiple factors, including soil type, corn variety, climatic conditions, and fertilization goals. Potassium fertilizer is critical for improving corn quality and yield, as potassium promotes root development and enhances the crop’s ability to absorb water and nutrients.

1. Soil Testing

Conducting a soil test before fertilization is essential. This helps determine the potassium content in the soil and identify deficiencies or excesses of other nutrients. Based on the test results, a targeted fertilization plan can be developed.

2. Recommended Application Rates

Recommended potassium fertilizer rates vary by region and soil conditions. In China, agricultural authorities may suggest applying 50-100 kilograms of potassium sulfate (K₂SO₄) or potassium chloride (KCl) per mu. These values are general guidelines, and actual amounts should be adjusted based on specific conditions.

3. Application Methods

Potassium fertilizer can be applied in several ways:

• Base Application: Spread the fertilizer evenly over the tilled soil. Suitable for long-term fertilization.
• Topdressing: Apply additional fertilizer during different growth stages, such as jointing, tasseling, and grain filling. This method allows flexible adjustments based on crop needs.
• Foliar Spraying: Spray a potassium solution directly onto corn leaves using a fogging machine. This rapidly supplements potassium but is costlier.

4. Precautions

• Avoid Overapplication: Excessive potassium can lead to soil accumulation, affecting the availability of other nutrients.
• Soil pH: Consider soil pH when using potassium fertilizer. In acidic soils, lime may be added to raise pH and improve potassium effectiveness.
• Combine with Other Fertilizers: Potassium should not be used alone. It must be paired with nitrogen, phosphorus, and other nutrients to ensure balanced crop nutrition.

5. Efficacy Evaluation

After fertilization, regularly monitor corn growth and potassium effects. Observe indicators like growth rate, leaf color, and health. Adjust strategies promptly if under- or over-fertilization occurs.

The optimal potassium rate depends on soil conditions, corn variety, and fertilization objectives. Conduct soil tests first, then tailor plans based on test results and local agricultural guidelines. Proper application methods and precautions ensure the best outcomes.