Best Practices for Farm Irrigation Management and Water Conservation
- Janine Russell, Farmbrite Co-Founder and CMO
- 4 days ago
- 12 min read
(Posted April 2024, updated August 2026)
Summary:
Effective irrigation management is essential for optimizing water use, maintaining crop health, and ensuring sustainable farm operations. By assessing your soil and crop needs, calculating evapotranspiration (ET), and using precision soil sensors, you can create a highly efficient watering strategy. Implementing advanced irrigation technologies and conservation practices will increase crop yields, conserve water, and reduce your overall farm expenses.
Key Takeaways
Understand Your Soil & Crops: Tailor water usage to crop species, growth stages, and soil types (clay, silt, sand).
Track Evapotranspiration (ET): Estimate water loss to the atmosphere and plants to adjust irrigation schedules accurately.
Utilize Soil Sensors: Deploy tools like capacitance sensors, tensiometers, and lysimeters to monitor real-time soil conditions.
Choose the Right System: Select the most efficient delivery method, such as drip irrigation, and use smart controllers.
Practice Conservation: Implement mulching, cover crops, and no-till techniques to maximize moisture retention.
The Importance of Irrigation Management
Effective irrigation and water management are crucial for successful agriculture, gardening, landscaping, or anything to do with growing crops. Irrigation management is essential for optimizing water use, maintaining crop health, and ensuring sustainable farm operations. You will save time and money by preparing a plan before you ever set anything up. Creating a strategic irrigation plan helps optimize water use, prevent nutrient loss, and ensure sustainable environmental outcomes. This guide breaks down the essential techniques and technologies to improve your farm's water efficiency.
Implementing the following practices can increase the efficient use of irrigation on your farm or growing system. The higher the efficiency, the fewer nutrients are lost and the better the environmental and economic outcomes. But before that, you need to learn and understand the specific irrigation practices for better farming outcomes. Read on to learn more about best practices for managing irrigation and water needs on your farm.
Assessing Water Needs
To avoid overuse or waste, you must understand exactly what your field requires. Evaluate the specific water needs for each crop based on their species, growth stage, and your local climate.
Consider environmental factors and the characteristics of your soil. Soil types drastically change water retention:
Clay: Particles less than 0.002mm
Silt: 0.002 - 0.05mm
Sand: 0.05 - 2mm
Chalky: Contains calcium carbonate or lime
Understanding Factors Influencing Crop Water Requirements
Understand the Water Requirements of your Crop: Determine the specific water needs for each crop based on its species, growth stage, and your local climate conditions.
Understand your Soil: Consider other environmental factors like soil type, clay, root depth, and canopy cover when assessing water requirements.
Clay: less than 0.002mm
Silt: 0.002-0.05mm
Sand: 0.05-2mm
Stones: bigger than 2mm in size
Chalky soils also contain calcium carbonate or lime
Understand and Calculate Evapotranspiration Rates (ET):
Evapotranspiration measures water lost through evaporation and plant transpiration. Many factors go into ET, such as solar radiation intensity, air temperature, wind speed, humidity, vegetative leaf area of the plant, and the stage of the plant roots. These are called potential evapotranspiration (PET)
You can use these factors to estimate water loss through evaporation and plant transpiration. It's understandable that during drought conditions, plants may not be able to extract water fast enough to keep up with evapotranspiration, and you will have to compensate.
Because these variables change seasonally, daily, or even hourly, you must adjust irrigation schedules accordingly. Monitor a local weather station or use farm management software to track these micro-climate changes.
Take control of your micro-climates with Farmbrite climate tracking. Set up custom climate gauges to track real-time weather, humidity, and historical data so you can optimize your irrigation and grow better crops.
Calculating Evapotranspiration Rates
Calculating ET involves complex variables like soil-water balance, surface resistance, and local climate variables. While many methods exist, using an online calculator is the easiest way to manage these equations.
ET Calculators
Calculating ET involves complex variables like soil-water balance and aerodynamic resistance. Use these calculators to simplify the process:
Evapotranspiration Methods:
As we've discussed, there are many methods to calculate ET. They each have their benefits and considerations. Please do more research on which method might be the best for your area and your crops and double-check your calculations.
Common ET Calculation Methods
Depending on your climate and available data, different methods may suit you better:
The PM method: The Penman-Monteith Method, a highly accurate calculation incorporating temperature, humidity, wind, and solar radiation.
The TH method: The Thornthwaite Method, a simpler approach relying primarily on temperature data.
The BC method: The Blaney-Criddle Method relies on temperature and the percentage of annual daylight hours.
The PT method: The Priestley-Taylor Method, a simplified PM method used when wind and humidity data are unavailable.
The HA method: The Hargreaves Method, a temperature-based empirical approach incorporating solar radiation.
The AB method: The Abtew Method, a simplified empirical model for estimating reference ET.
The Eddy Covariance: The Eddy Covariance, also known as Eddy correlation or eddy flux, is a technique to measure vertical fluxes of gases and heat in microclimates.
As you can see, there are multiple ways to calculate evapotranspiration. You might use any one of these methods, try a calculator, or all of the above to help you meet the irrigation needs of your farm. As we're discussing precision agriculture here, let's talk about soil moisture monitoring next.
Soil Moisture Monitoring:
Soil monitoring plays a crucial role in agriculture, landscaping, and environmental studies by providing valuable data on soil conditions. This is done through the use of sensors. These sensors help in optimizing irrigation, managing soil health, and ensuring sustainable farming practices.
There are many types of sensors that you can opt to have on your farm. Here are some types of sensors and their uses.
Soil Moisture Monitoring and Sensors
Sensors optimize irrigation by providing real-time data on soil conditions, preventing over-watering and nutrient runoff.
Moisture Sensors: Capacitance sensors, tensiometers, TDR, and FDR sensors measure exact water content and the energy plants expend to extract it.
Temperature & Nutrient Sensors: Thermocouples and Ion-Selective Electrodes (ISEs) track soil warmth and specific nutrients (like nitrate or potassium).
pH & Gas Sensors: Monitor acidity, CO2, and oxygen levels to gauge root health and microbial activity.
Lysimeters: Devices that measure water permeating through the soil to help understand leaching and water movement.
More About Soil Moisture Sensors
Capacitance Sensors: These sensors measure the change in capacitance caused by variations in soil moisture. Capacitance is a method of measuring the amount of water in soil through its capacity to transmit electromagnetic waves or pulses. This is commonly used in agricultural applications due to its fast response and cost-effectiveness.
Tensiometers: These sensors measure soil water tension or matric potential, which means they indicate how much energy plants need to extract water from the soil. Often, they are used to determine irrigation needs and to monitor plant stress levels.
Time-Domain Reflectometry (TDR) Sensors: TDR sensors measure the dielectric constant of soil, which is related to moisture content in the soil. They are known for their high accuracy and versatility in various soil types.
Frequency-Domain Reflectometry (FDR) Sensors: Similar to TDR sensors, but FDR uses high-frequency signals to measure soil moisture. These are often used in precision agriculture and research due to their accuracy.
Soil Temperature Sensors
Thermocouples: These consist of two different metals that produce a voltage proportional to temperature. They are used to monitor soil temperature, which can impact plant growth and nutrient uptake.
Thermistors: A type of resistance thermometer that is temperature-dependent resistance to measure soil temperature. These are commonly used due to their sensitivity and range of applications. They are made with metallic oxides.
Soil Nutrient Sensors
Ion-Selective Electrodes (ISEs): Measure specific ions, such as nitrate, potassium, or phosphate, in the soil. They are useful for monitoring nutrient levels and guiding fertilization practices.
Electrical Conductivity Sensors: Measure the conductivity of soil, which is influenced by the concentration of dissolved salts and nutrients. Often used to assess soil salinity and guide fertilization and irrigation.
Soil pH Sensors
Glass Electrode pH Sensors: Measure soil acidity or alkalinity by detecting hydrogen ion activity. They are useful for determining soil pH and guiding soil amendment practices.
Solid-State pH Sensors: More durable than glass electrodes, these sensors are used for long-term monitoring in harsh conditions.
Soil Gas Sensors
Carbon Dioxide (CO2) Sensors: Measure CO2 levels in the soil, which can indicate soil respiration and microbial activity. They are useful for assessing soil health and decomposition rates.
Oxygen Sensors: Measure oxygen levels in the soil, indicating soil aeration and drainage. Important for monitoring conditions that affect root growth and soil organisms.
Soil Structure Sensors
Penetrometers: Measure soil compaction and resistance to penetration. They are used to assess soil structure and determine the need for soil aeration or tillage.
TDR and FDR Probes: Apart from measuring moisture, these probes can also provide information on soil density and structure.
Lysimeters:
Lysimeters are not sensors themselves but are devices used to measure the amount of water that permeates through the soil and the dissolved substances carried with it. The use of lysimeters in agriculture has brought much more information to soil science, agricultural research, and hydro and environmental studies. It records the amount of precipitation in an area and the amount lost through the soil. This measurement is crucial for understanding processes like evapotranspiration, leaching, and water movement within soil profiles.
Weighing Lysimeters:
These lysimeters are designed to measure changes in weight over time, allowing researchers to quantify water loss through evapotranspiration. They usually consist of a container filled with soil and plants, placed on a scale or load cells to measure weight changes due to water loss and gains through precipitation or irrigation.
Drainage Lysimeters:
These lysimeters are designed to collect and measure the quantity and quality of water that drains through the soil profile. They often consist of a container or a designated plot with a collection system at the bottom to capture percolating water. The collected water can then be analyzed for dissolved substances, such as nutrients, pollutants, or other chemicals.
Now that we've gone over calculations and sensors you might use to help give you specific data about your soil and water use, let's talk about irrigation best practices.
7 Best Practices for Irrigation Management
Irrigation best practices can be any set of techniques, technologies, and management strategies that aim to optimize water use in agriculture while promoting sustainability, crop health, and resource efficiency. Implementing these practices can increase crop yield, reduce water waste, and minimize environmental impacts. We will break down some of the things you may want to take into account when creating your irrigation plan.
1. Assess Needs and Requirements
Evaluate your soil's water-holding capacity and tailor your approach to the specific, phase-based needs of your crops.
Understanding the specific water needs of your crops is vital and is where the calculations above can help. Different crops require varying amounts of water, and climate factors like temperature, rainfall, humidity, and wind all go into planning irrigation schedules.
2. Choose the Right Irrigation System
Select a system matching your farm's layout and budget:
Drip Irrigation: The most efficient option, providing water directly to the root zone with minimal evaporation.
Sprinkler Irrigation: Good for broad coverage but susceptible to wind and evaporation.
Center Pivot: Excellent for uniform distribution over large-scale fields.
Surface Irrigation: Also known as flood irrigation, which includes furrow and basin irrigation and is generally used for row crops. It can be less efficient due to runoff and uneven distribution.
3. Implement Advanced Irrigation Technologies
If you have the means, Upgrade to smart, weather-based controllers and integrate soil moisture sensors to automate schedules based on real-time field data. Here are a few options to look into.
Smart Controllers: Use weather-based or soil moisture-based controllers to adjust irrigation schedules automatically based on current conditions.
Soil Moisture Sensors: These sensors monitor soil moisture levels, helping to ensure that irrigation occurs only when necessary, reducing over-irrigation.
Weather-Based Systems: You might incorporate weather data to adjust irrigation based on rainfall, temperature, and other climatic factors. There are more and more weather monitoring systems popping up as the climate changes. We find clients like to monitor their microclimate with these.
Remote Monitoring and Control: Allows farmers to monitor and control irrigation systems remotely, enhancing flexibility and responsiveness.
4. Optimize Irrigation Schedules
Water during the early morning or late evening to reduce evaporation. Aim for deep, infrequent irrigation to encourage strong, resilient root growth.
Irrigation scheduling is essential to reduce water wastage or insufficient water. Incorrect irrigation has two consequences: either stunted growth or water wastage. Effective irrigation scheduling will conserve labor, resources, and plant nutrients, and you'll need to consider the following essential parameters when preparing an irrigation schedule.
5. Implement Water Conservation Practices
There is much that can be done to conserve water. Determining irrigation water use helps you see the irrigation system's performance. You can measure it directly using a meter or a periodic manual measurement. Or measure it indirectly by determining energy, irrigation water pressure, and more.
This practice will help you know the cost associated with water use and will trigger the need to integrate water conservation measures to reduce the cost. Also, it will help you understand when the irrigation appliances are not functioning correctly.
Some other water conservation practices:
Mulching: Apply mulch to retain soil moisture and reduce evaporation.
Cover Crops: Use cover crops to protect soil, reduce erosion, and retain moisture.
Rainwater Harvesting: Collect and store rainwater for irrigation to reduce dependency on external water sources. (This may not be available in all areas of the country, so check your area.)
Use Reclaimed Water: If available and safe, reclaimed or recycled water can supplement irrigation.
6. Regular Maintenance and Monitoring
Regularly audit your systems for leaks or clogged emitters. Ensure sensors are properly calibrated every season.
7. Sustainable Practices and Regulations
New technologies and sustainable practices will be more available as we continue to research and make progress in agriculture.
Conventional tilling degrades soil structure. Adopting no-till or low-till methods improves the soil's ability to retain moisture and reduces runoff. Pair this with land leveling, furrow dikes, or linear move sprinklers for maximum efficiency.
Conservation Tillage (No-Till) and Crop Residue Management
Tilling has been a conventional practice of farming for many years. It can be hard on the land, so conservation tillage practices like low-till or no-till methods are being used more and more on farms.
These techniques improve the ability of the soil to hold moisture and reduce the amount of water that runs off from the field. Also, it reduces the amount of water evaporation from the soil surface.
However, not all irrigation systems can incorporate conservation tillage. Surface irrigation systems such as furrow irrigation will not achieve their maximum possible efficiency and application uniformity, as residue can obstruct water flow and prevent water from passing through it.
The benefits of no-till will vary with climate and irrigation method practiced, such as;
Land leveling: Land leveling is a system based on topographic surveys, and it's used to increase uniformity with which water is applied to an irrigated field. If you have more than one irrigation method or crop, leveling should be according to the most restrictive method and yield. You can level a farm that has never been graded or ground before preparing seed beds. Land leveling helps in nutrient retention as it reduces runoff. You can use a laser-controlled scraper pulled by a tractor for better leveling. The laser has a predetermined cross, runs slopes, and automatically adjusts the cut of filled land over the plane of the field.
Furrow dikes: Furrow dikes are a system where small earthen dams are constructed at intervals along the furrows to reduce runoff from the soil surface and increase water infiltration. It's a technique in which water is applied to the field to form a water layer that infiltrates the soil. Its use is limited to gently sloping land. Still, it is primarily used in areas for row crops to capture rainfall, reduce runoff, and improve the uniformity of low-pressure sprinkler irrigation systems. They are typically installed when the crop bed is prepared before planting or after planting but before the crop height could reach one that installing dikes could cause damage. You can remove furrow dikes if the increase in moisture is causing adverse effects on production or harvesting.
Drip irrigation: Drip irrigation is the slow application of water directly to the plant root zone using particular delivery items. It is advantageous as it leads to uniformity, preservation of soil structure, reduction in evaporation, better water control, and nutrients reaching the plant. The use of a drip system is not primarily to reduce water wastage but to increase crop yield and quality. In this application, you might want to consider a situation where natural precipitation or stored soil water is insufficient for germination, so you can ensure the system can provide sufficient water to germinate the seed. Also, you'll need to maintain and monitor issues regarding clogging and backflushing of emitters, monitor application pressure, and replace the equipment. You can inject cleaning agents depending on the drip irrigation system specification. For instance, if you're using ditch water, you might have a lot of silt that builds up, and drip irrigation might not be the best option.
Linear move sprinkler irrigation system: The system contains a series of towers that suspend the irrigation system and irrigate along the rows of your farm. Usually, they're supplied by water from a source adjacent to the first tower and parallel to the direction of the move by a flexible hose that, in turn, provides water through a series of risers connected to a buried pipeline. This can also be managed through hoses or other means. This type of system is ideal where a center pivot irrigation may not be available due to the shape of the field, elevation, or the farm layout. It works with many areas and soil types as well as a wide variety of crops. You can use low-pressure and high-pressure systems, but best practice for irrigation recommends low-pressure because they have a higher water application efficiency than high-pressure systems. Also, you can convert high- or medium-pressure designs to low-pressure to achieve better results.
Other Conservation Best Practices for Irrigation Include;
Place plant species and pot sizes with similar water needs in the same watering zone.
Ensure each watering zone has spray emitters with similar flow rates to maintain uniformity.
Make system upgrades and improvements, and repair the system equipment.
Ensure that appropriate filtration is used, regularly clean filters, and flush and unclog the emitters.
Use an on/off valve to prevent runoff while hand watering.
Consolidate plants and turn off irrigation in unused portions to avoid wastage.
Avoid irrigating outdoors in windy seasons.
Regularly change the irrigation schedules to reflect changes in weather, crop needs, or soil moisture values.
Use suitable and uniform nozzle sizes and sprinkler heads with a high uniformity rating.
Consider converting to an irrigation system with high potential uniformity if irrigation uniformity remains an issue after several improvements.
Final Thoughts on Irrigation Management
Learning about the best irrigation is essential for all crop farmers. The goal of effective irrigation management practices is to efficiently and effectively utilize your water resources. Applying smart irrigation techniques and conservation practices will help prevent water contamination, improve management practices, and be beneficial to the farm overall.
Your farm can optimize its irrigation management, leading to improved crop yields, reduced water usage, and enhanced sustainability.
By implementing these practices, you can achieve efficient irrigation that supports crop health and conserves vital resources. If you'd like more tools to optimize your farm's data and schedules, give Farmbrite a try for free for 14 days.
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