1、Nitrogen fertilization and potassium requirement for cereal crops under

Nitrogen (N) and potassium (K) are the most required nutrients for corn and wheat production. Increasing the N application rate usually boosts crop yields. However, many uncertainties remain for K management.

2、Understanding Nutrient Requirements for High

Agronomic advancements have brought corn yields to new heights, but producers have had little guidance on how to meet the nutrient requirements of modern, high-yield corn hybrids in a way that maximizes their yields.

3、Nitrogen, Phosphorus, and Potassium Uptake in Rain

To bridge this knowledge gap, a 2-year field study was conducted in a rain-fed corn production system. The study aimed to evaluate the impact of nitrogen (N), phosphorus (P) and potassium (K) fertilization on N, P, and K contents in aboveground plants at different growth stages.

4、Micronutrients concentration and content in corn as affected by

The interaction between nitrogen (N), phosphorus (P), and potassium (K) fertilizers significantly impacts the uptake of micronutrients in corn, influencing their availability in soil and uptake by plants.

5、Nitrogen and Potassium Interactions in Corn

Extensive research in the North Central region has investigated separately nitrogen (N) and potassium (K) fertilizer management for corn. However, there is scarce information available about how N and K interactions affect corn grain yield and nutrient uptake.

Corn Fertilization

Corn uses substantial amounts of nitrogen (N), phosphate (P2O5), and potash (K2O) and relatively small amounts of secondary nutrients and micronutrients. Table 1 lists specific amounts of each nutrient removed from the soil by corn stover and grain at a yield level of 150 bushels/acre.

(PDF) Effects of soil phosphorus and potassium levels on corn yield

In optimum and high soil-test P and K soils, corn grain yield increased to a plateau with increasing N rates and an EONR (0.1 ratio) of 130 lb N/a was observed across all site-years, with no...

Importance of Phosphorus and Potassium in Corn Development

Potassium helps increase disease resistance and water stress tolerance. Adequate K increases the ability of corn plants to efficiently uptake other nutrients. Soil test results and determining the rate at which a removes P and K from the soil can help guide fertility management decisions.

Effects of Soil Phosphorus and Potassium Levels on Corn Yield Response

In optimum and high soil-test P and K soils, corn grain yield increased to a plateau with increasing N rates and an EONR (0.1 ratio) of 130 lb N/a was observed across all site-years, with no difference in AONR or yield at the AONR (240 to 242 bu/a) between optimum and high levels.

Micronutrients concentration and content in corn as affected by

The interaction between nitrogen (N), phosphorus (P), and potassium (K) fertil-izers significantly impacts the uptake of micronutrients in corn, influencing their availability in soil and uptake by plants.

Corn, as a vital food crop, has critical nutrient requirements during its growth. Different fertilization strategies involving nitrogen (N) and potassium (K) significantly impact corn development, yield, and quality. Below is a detailed discussion of the applications, advantages, and limitations of these two fertilizers in corn production.

I. The Role and Application of Nitrogen Fertilizer

1. Promotes Leaf Growth: Nitrogen, one of the three essential macronutrients for plants, is crucial for chlorophyll synthesis. Appropriate nitrogen fertilization stimulates leaf expansion, enhances photosynthesis, and increases dry matter accumulation, thereby boosting overall yield.
2. Accelerates Seed Maturation: Nitrogen accelerates grain maturation, shortening the growth cycle and improving per-unit area productivity.
3. Improves Quality: Moderate nitrogen use enhances protein content in grains and improves taste.
4. Yield Potential: Nitrogen fertilization amplifies corn’s yield potential, particularly under adequate supply.
5. Economic Efficiency: Nitrogen fertilizers are relatively inexpensive, offering cost advantages.
6. Environmental Risks: Excessive nitrogen can lead to soil salinization, groundwater contamination, and environmental degradation.

II. The Role and Application of Potassium Fertilizer

1. Enhances Disease Resistance: Potassium strengthens root absorption, improves plant immunity, and reduces disease incidence.
2. Improves Quality: Potassium increases starch content, sweetness, and nutritional value of grains.
3. Promotes Ear Development: It supports cob formation and boosts yield.
4. Delays Senescence: Potassium slows down aging, extending post-harvest shelf life.
5. Economic Efficiency: Despite higher costs, potassium’s impact on yield and quality ensures high input-output ratios.
6. Environmental Risks: Excessive potassium may elevate heavy metal accumulation in soil, posing long-term ecological and health hazards.

III. Comprehensive Analysis and Recommendations

1. Balanced Fertilization: Adjust N and K ratios based on growth stages and soil conditions. Nitrogen demand peaks during the jointing to tasseling stages, while potassium needs surge during silking to grain filling.
2. Combine Organic and Synthetic Fertilizers: Organic matter supplements micronutrients, reducing synthetic fertilizer reliance and environmental harm.
3. Integrated Farm Management: Pair fertilization with proper irrigation, weed control, and pest management to optimize yields.
4. Soil Testing and Fertilizer Selection: Conduct pre-planting soil tests to assess nutrient levels and pH, choosing fertilizers tailored to local conditions.
5. Monitoring and Adjustment: Regularly track soil nutrients and crop performance, refining strategies as needed.

corn requires balanced nitrogen and potassium inputs, tailored to crop needs, soil properties, and environmental factors. A synergistic approach combining scientific fertilization with agronomic practices maximizes yield, quality, and sustainability, advancing agricultural resilience.