Tips For Efficient Nebraska Irrigation During Drought

Drought raises the stakes for Nebraska irrigators. Efficient irrigation during periods of limited water availability is not only an economic necessity but also a stewardship responsibility. This article presents practical, field-tested strategies to reduce water use while maintaining yield potential, protect soil health, and comply with local water regulations. It focuses on concrete actions, scheduling tools, equipment adjustments, and agronomic practices suited to Nebraska’s climate, soils, and common cropping systems.

Understand the local water context

Nebraska water management is driven by a mix of surface water, groundwater (primarily the High Plains aquifer), and local Natural Resources District (NRD) rules. Before changing irrigation practices, growers should confirm current pumping rights, allocation rules, and any temporary drought restrictions from their NRD. These rules can vary by district and by the water source.
Make a local water audit:

Measure current water use by reading flow meters regularly.
Compare seasonal pumping totals to permit limits.
Track well levels and any observed declines.
Note spatial variability: fields, pivot corners, and different soil types often show different water responses.

Understanding the legal and physical water context prevents penalties and helps prioritize where efficiency gains will have the most impact.

Prioritize fields and crops by value and vulnerability

Drought forces choices. Prioritize fields where irrigation yields the largest economic return or where a moisture deficit will cause irreversible damage (for example, reproductive-stage corn). Lower-priority fields or less-sensitive crops can receive reduced allocations.
Consider these criteria when prioritizing:

Crop price and margin per irrigated acre.
Crop stage and sensitivity (e.g., tassel/silking corn, pod set in soybeans).
Soil water-holding capacity: deep, loamy soils buffer drought better than sandy soils.
Historic field performance and irrigation responsiveness.

Decision-making that focuses scarce water on high-value or high-response acres yields more return on reduced water use.

Optimize irrigation scheduling — science over guesswork

Irrigation scheduling is the most effective way to reduce unnecessary water application. Replace calendar-based or visual-only scheduling with measurements and crop-based thresholds.
Key tools and metrics:

Soil moisture sensors (capacitance, TDR) placed at multiple depths to represent the root zone.
Evapotranspiration (ET) estimates using weather data and crop coefficients (Kc) to calculate crop water use.
Plant-based indicators (crop stress sensors, canopy temperature) as secondary confirmation.
Flow meter data to track actual applied water per event.

Scheduling strategy during drought:

Define depletion thresholds by crop stage (lower depletion limits during critical growth phases). For example, keep available water depletion below 30-40% of plant-available water during reproductive stages for corn.
Prioritize smaller, more frequent irrigations if runoff or deep percolation losses are likely, or when only limited water is available to protect root function.
Use deficit irrigation deliberately: allow controlled stress during less-sensitive growth stages, but avoid stress during reproductive stages when yield losses per unit water are greatest.

Retrofit and maintain infrastructure for maximum uniformity

Irrigation efficiency depends heavily on system uniformity. Low uniformity wastes water and increases crop stress variability.
Practical actions:

Perform a distribution uniformity (DU) test on pivots and sprinklers. Target DU in the 80s percent range; anything below 70% requires correction.
Fix worn nozzles, cracked hoses, misaligned sprinklers, and bent pivot spans. Replace or recalibrate nozzles to match designed flow and pressure.
Check and repair leaks, low-pressure zones, and valve malfunctions.
Consider nozzles or pressure regulators designed for lower application rates to reduce runoff on heavy soils.
Where feasible, transition high-response areas to low-volume systems such as drip or subsurface drip, which can reduce evaporation and deep percolation losses.

Subsurface or drip systems require upfront investment and tight management but can deliver substantial water savings in high-value crops and specialty rotations.

Employ improved irrigation methods and technologies

Technology can stretch scarce water.

Variable-rate irrigation (VRI): Apply water according to in-field soil and crop variability mapped by yield, EM or soil maps. VRI reduces overwatering in high-water-holding areas and concentrates water where needed.
Soil moisture mapping: Use mobile sensors or remote sensing to create spatial moisture maps and guide VRI decisions.
Telemetry and automation: Remote control lets you apply precisely timed, short irrigations and respond quickly to weather events like rain.
Low-energy precision application (LEPA) for pivots: Reduce evaporation losses on windy days by applying water close to the canopy.

Adopt technologies incrementally and validate ROI with a field-scale trial before full-scale investment.

Agronomic adjustments that save water and protect yield

Crop and field management can significantly lower irrigation demand.

Crop choice and hybrid selection: Favor more drought-tolerant hybrids or varieties, and evaluate maturity selection to avoid late-season water deficits.
Plant population: Lowering plant density can reduce overall crop water use while maintaining yield per acre in water-limited environments. Reduce population gradually and use side-by-side trials to measure impact.
Tillage and residue management: Conservation tillage and maintaining crop residue increase water infiltration, reduce evaporation, and improve soil organic matter and water-holding capacity.
Root-zone health: Avoid frequent, shallow irrigations that encourage shallow rooting. Promote deeper rooting through periodic deeper irrigations or soil amendments.
Nutrient management: Apply fertilizers at times that match uptake. Overapplying nitrogen can increase water demand; banding or split applications can improve uptake efficiency.

Manage salinity and water quality issues

Drought can concentrate salts in irrigation water and the root zone, especially when using lower-quality surface sources.

Monitor soil EC (electrical conductivity) and test irrigation water quality periodically.
Apply enough leaching irrigation when water is available to move salts below the root zone, focusing on critical fields and tile-drained areas.
Use amendments such as gypsum where sodium is a problem, but do so based on soil testing and agronomic guidance.

Ignoring salinity can reduce crop responsiveness to scarce water and permanently damage soil structure.

Operational tactics for drought years

Short-term operational changes can provide flexibility.

Stagger irrigation across pivots to smooth pump demand and extend available water throughout the season.
Coordinate irrigation scheduling with neighbors on shared surface water to optimize timing and volume across the watershed.
Reduce nonessential use: shut off tailwater systems, avoid irrigating marginal, low-yielding acres, and limit washdown uses.
Capture and use on-farm runoff where possible by contouring or using small ponds for emergency supply, adhering to local regulations.

Economic and risk management considerations

Irrigation decisions during drought are also economic decisions.

Calculate water value: Estimate yield response per inch of water by crop and stage to determine where water provides the most return.
Use crop insurance, forward contracting, or hedging to reduce financial exposure when choosing to deficit irrigate or abandon low-return acres.
Keep accurate records of water use, yields, and costs to inform future drought planning and permit reporting.

Step-by-step plan to implement an efficiency program (practical checklist)

Verify legal water limits, NRD rules, and current permit status.
Audit existing water use: flow meters, well logs, and pump performance.
Identify priority fields and crops based on economics, soil, and crop sensitivity.
Install or validate soil moisture sensors and set depletion thresholds by growth stage.
Test and repair irrigation equipment; perform DU testing and correct non-uniform areas.
Implement scheduling based on ET and soil moisture, with conservative depletion levels during critical stages.
Trial VRI, nozzle changes, or LEPA in a subset of fields before wider adoption.
Adjust agronomy: plant population, hybrid choice, residue management, and nutrient timing.
Monitor soil salinity and water quality; plan leaching when water is available.
Record outcomes and refine the plan annually.

Practical takeaways for Nebraska producers

Measure first: know exactly how much water you are using and where.
Protect critical stages: avoid water stress during reproductive phases when yield penalties per inch are highest.
Fix uniformity problems: the cheapest gallon saved is the one not wasted by poor distribution.
Use technology judiciously: sensors, ET tools, and VRI pay back fastest when integrated into a disciplined management program.
Prioritize by return: invest limited water where it produces the biggest economic and agronomic return.
Maintain flexibility: seasonal decisions should be revisited regularly as weather and available water change.

Efficient irrigation in drought conditions requires a mix of good measurement, targeted management, and practical infrastructure improvements. By combining careful scheduling, prioritized field allocation, system maintenance, and agronomic adjustments, Nebraska irrigators can stretch scarce water resources while protecting yields and long-term soil health.