Efficient farming with 2024's residual nitrogen

By Scout Nelson

The dry conditions of Nebraska's 2024 growing season have led to higher-than-average residual nitrogen levels in the soil, particularly for rainfed crops. This residual nitrogen offers farmers an opportunity for better fertilizer planning in 2025, helping reduce costs and improve yields while protecting soil and water quality.

Why Residual Nitrogen Increases After Drought

Dry conditions limit nitrogen uptake in crops since water is essential for nutrient absorption. Without sufficient moisture, nitrogen remains unused in the soil, accumulating within the root zone. This residual nitrogen can be a valuable nutrient source for crops in the next growing season, reducing the need for additional fertilizer.

Importance of Soil Sampling for Accurate Assessment

Soil sampling is crucial for understanding residual nitrogen levels, enabling efficient fertilizer adjustments. Spring sampling provides the most accurate data, as it accounts for any nitrogen movement or losses during winter. Sampling to a depth of 2-3 feet is recommended, as nitrate can accumulate in lower layers after surface leaching.

Adjusting Fertilizer Applications Based on Test Results

The information from soil tests helps farmers adjust nitrogen applications. If nitrate levels are high, they can reduce spring nitrogen applications, lowering both costs and the risk of nitrate leaching. Proper nitrogen management promotes sustainable agriculture and minimizes environmental impact.

Benefits of Residual Nitrogen for Fertilizer Planning

Cost Savings: Using residual nitrogen reduces the amount of fertilizer required, helping manage production costs.

Environmental Protection: Limiting nitrogen use reduces groundwater contamination, supporting sustainable farming.

Enhanced Crop Performance: Tailoring nitrogen levels to crop needs promotes healthier growth and higher yields.

Efficient Nitrogen Management Tips for 2025

To maximize residual nitrogen, farmers should conduct spring soil sampling, limit early nitrogen applications, and use decision support tools like the UNL nitrogen calculator. This approach helps apply nitrogen only where needed, enhancing efficiency across fields.

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