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Writer's pictureAsh Jones

Optimising Water Usage in Agriculture with Drone Surveys

Mavic 3 Multispectral Drone Flying over a Field
DJI Mavic 3 Multispectral Drone Flying over a Field collecting data.

Water management is a critical aspect of modern agriculture, especially in regions that experience long, dry summers. Australian farmers are no strangers to the challenges posed by water scarcity. Efficient water usage not only ensures the sustainability of crops but also conserves this precious resource. One of the most innovative solutions to optimise water usage in agriculture today is the use of drone surveys. These high-tech tools offer a range of benefits, particularly in monitoring soil moisture levels and identifying areas that require irrigation. This blog will delve into how drone technology is revolutionising water management in agriculture.


The Role of Drones in Modern Agriculture

Drones, or Unmanned Aerial Vehicles (UAVs), have become indispensable in various industries, and agriculture is no exception. Equipped with advanced sensors and imaging capabilities, drones can cover large areas quickly and provide detailed data that would be difficult, if not impossible, to obtain through traditional methods.


Monitoring Soil Moisture Levels

One of the primary uses of drones in agriculture is to monitor soil moisture levels. Here's how drones contribute to this crucial task:


1. Multispectral and Thermal Imaging

Levels of Multispectral data
Levels of Multispectral data

Drones equipped with multispectral and thermal cameras can capture images that reveal variations in soil moisture. Multispectral imaging involves capturing light from different parts of the electromagnetic spectrum, including infrared, which is particularly useful in assessing plant health and soil conditions. Thermal cameras detect temperature variations, which can indicate moisture levels as dry soil heats up more quickly than moist soil.


2. Real-Time Data Collection

Drones can fly over fields and collect data in real-time. This allows farmers to make timely decisions about irrigation, ensuring that water is applied precisely where and when it is needed. By identifying dry areas early, farmers can prevent crop stress and improve yields.


3. High Resolution and Accuracy

The high resolution of drone imagery provides detailed insights into soil moisture levels. Unlike satellite images, which can be limited by cloud cover and lower resolution, drone images offer precise information down to the plant level. This accuracy is crucial for targeted irrigation.


Identifying Areas Needing Irrigation

Effective water management hinges on knowing exactly where irrigation is needed. Drones excel in this area by:


1. Mapping Irrigation Zones

Using the data collected from multispectral and thermal imaging, drones can create detailed maps of irrigation zones. These maps highlight areas with different moisture levels, enabling farmers to tailor their irrigation strategies. Instead of watering entire fields uniformly, they can focus on zones that require more attention, conserving water and reducing costs.


2. Detecting Irrigation System Issues

Drones can also be used to inspect irrigation systems. They can identify leaks, blockages, or malfunctioning equipment that may be causing uneven water distribution. Prompt identification of these issues allows for quick repairs, ensuring that irrigation systems operate efficiently.


3. Assessing Crop Health

Healthy crops reflect proper water usage. Drones can monitor crop health by analysing plant colour and growth patterns. Areas with stunted growth or discoloured leaves often indicate insufficient irrigation. By pinpointing these areas, farmers can adjust their water application accordingly.

A normal, healthy, plant will absorb visible blue and red light and reflect green visible light, which is why they appear green to our eyes. In addition to green visible light, plants also reflect Near-Infrared (NIR) as this type of light isn’t actively used for the photosynthesis process. When a plant is weak or diseased, reflection of this NIR light is greatly decreased. Since red light is still being absorbed the same as a healthy plant, a mathematical algorithm can calculate the difference in what is being reflected across a field of crops. Once calibrated and processed, it will become clear which plants are thriving and which are struggling.
How NDVI Works

The Importance of Optimising Water Usage

Optimising water usage is particularly crucial during spring and summer when temperatures rise and water demand increases. Efficient water management not only ensures that crops receive adequate hydration but also:

  • Reduces Water Waste: Precise irrigation minimises water wastage, which is essential in regions prone to drought.

  • Lowers Costs: By targeting irrigation efforts, farmers can reduce water bills and energy costs associated with pumping water.

  • Promotes Sustainable Farming: Sustainable water usage practices help preserve natural resources for future generations, aligning with environmental stewardship goals.


Watering a crop

Implementing Drone Technology on Australian Farms

Australian farmers have been quick to adopt drone technology, recognising its potential to enhance agricultural practices. Implementing drones involves several steps:

  • Selecting the Right Drone: Farmers should choose drones equipped with the appropriate sensors for their specific needs, such as multispectral or thermal cameras.

  • Training and Expertise: Proper training is essential to operate drones and interpret the data collected. Many agricultural service providers offer drone operation and data analysis services.

  • Integrating with Existing Systems: Drones should be integrated with existing farm management systems to streamline data collection and analysis.


Conclusion

Drone surveys are transforming the way Australian farmers manage water usage. By providing real-time, accurate data on soil moisture levels and identifying areas needing irrigation, drones enable more efficient and sustainable farming practices. As technology continues to advance, the role of drones in agriculture will only become more significant, helping farmers to conserve water, reduce costs, and improve crop yields. Embracing this innovative tool is a step towards a more sustainable and productive future for agriculture.

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