Drone Cover Crop Seeding: How UAVs Are Transforming Planting

Cover crops are essential as they help control weeds, improve soil structure, and enhance biodiversity, all of which are beneficial for growing plants.

However, the timing of when to apply these cover crops can make or break your harvest. Sometimes, there is limited time to plant them, or the methods you need to use to plant these cover crops may end up causing more harm than good.

Enter drone technology. Drone technology has improved speed and efficiency while reducing costs in several other industries. Today, we will discuss how agricultural drones are transforming the planting of cover crops.

How Drone Seeding Works

Drone seeding involves attaching a seeder or spreader to a drone, enabling it to broadcast seeds across the farm. There are two components involved: hardware and software.

Hardware Components

This is all the hardware involved in the seeding process. Besides the spreaders and seeders, it also includes;

• GPS navigation – GPS enables the drone to navigate and maintain stable flight. Most seeding and spreading applications are automated, where the drone is preprogrammed to follow a specific path, avoid any obstacles, and spray on some sections while leaving others. This is all powered by GPS.
• Batteries – To accomplish seeding and spreading, the drones come equipped with high-performance batteries that can deliver a significant amount of power, sufficient to lift the weight and power all the drone components. These batteries also charge quickly, allowing farmers to run a continuous operation.
• Payload systems – These are the mechanisms designed to carry extra devices on a drone. You will find that the same drone you use to spray is the same one you will use to seed. You can also swap different spreader systems depending on the size and weight of the seeds.
• Sensors – Drones have been referred to as flying computers because they carry a wide range of sensors and are constantly processing information. Besides the IMU and compass, seeder drones carry additional sensors that measure speed, height, and wind speed, using this information to adjust the application and spreading rate.
• Imaging sensors – These are optional, but can help you collect data about your farm that can help you refine the seeding process. They include RGB, multispectral, LiDAR, and thermal, all collecting different data ranging from elevation to soil health.

Software Components

The software components ensure that everything runs together to accomplish the task at hand. They include;

• Flight planning – This is the software you use to map your farm and create flight routes for the drone, specifying where it should fly or not, where it should seed or not, etc.
• Mapping and GIS software – This is the software you will need to process the raw RGB, LiDAR, multispectral, or thermal data into usable information.
• Control apps – These are the software applications you use to adjust seeding rates and other information, enabling the drone to fly autonomously. Most drones will also come with built-in templates with settings for specific crops, but you can also customize them for other seeds.
• Cloud integration – You can integrate the drone software with other farm software for more efficient farm management and tracking. You can retrieve the logs from the drone and analyze them with other software to determine the effectiveness of the seeding process, identifying what worked, what didn’t, and what adjustments are needed.

Why You Should Consider Drones for Cover Crop Seeding

Below are the specific benefits drones bring to cover crop seeding compared to traditional methods.

Improved Efficiency

Drone technology has tremendously evolved. As mentioned earlier, we have drones equipped with advanced spraying systems and software that enable you to adjust the spreading rate, swath, and even customize the spreaders for specific types of seeds. This allows farmers to increase their planting efficiency since it reduces wastage, and they have more control over where the crops are planted. Some cover crops, such as ryegrass, turnips, and oats, have also been proven to germinate better when applied aerially compared to other application methods, making drones the perfect fit for such applications.

Versatility

Drones come in different types and sizes, each suited for other tasks. One drone is also capable of working with various types of payloads, allowing you to collect different types of data. When using crop spraying drones, you can easily swap the spreader tanks to accommodate different types of seeds, making them suitable for various applications.

Speed

Drones are quite fast, covering more ground at a time compared to broadcast spreaders or seed drills. This makes them vital when you have a small window to plant the cover crops. Drones can also quickly and effectively map your farm, giving you access to real-time information about soil nutrient and moisture levels, allowing you to maximize the yields of both the cover crops and the commercial crops.

Accessing hard-to-reach areas

One of the biggest selling points about drones is their ability to access difficult areas. When dealing with waterlogged areas, uneven terrain, or any other difficult condition that makes it challenging to access the section of the farm, you can deploy drones to seed in those sections.

What do you do when you need to apply cover crops during winter? Drones can come to the rescue, allowing you to access your farm and plant during this time, leaving no downtime to your planting patterns and maximizing your harvests.

Applying to Standing Crops

When you want to plant cover crops on standing crops like corn or soybeans, doing so manually or using tractors can lead to severe damage to the crops, which counteracts your efforts to achieve a more productive harvest. In such cases, you can deploy drones to seed these clover crops, minimizing damage to the crops while ensuring efficiency in planting.

Reduced Soil Compaction

One of the biggest challenges of traditional methods for cover crop seeding is soil compaction. While the cover crops themselves aim to improve the soil, compaction from people or heavy machinery can cause irreversible damage, leading to significant losses. Drones, on the other hand, fly over the crops and don’t come into contact with the soil, making them a better option for soils that are at risk of compaction.

Portability

Drones are not that heavy, even the larger spraying ones. This makes it easy to move them from one part of the farm to another compared to other heavy machinery you may have on the farm. You could even fly the drone from one part of the farm to another, eliminating the need for a vehicle. And when you do use a vehicle, it will be more convenient compared to moving other farm machinery.

Cost Effectiveness

While there is still a debate on the cost of drone cover crop seeding compared to other ground methods, there is no doubt that drones are more cost-effective than manned aircraft. They are cheaper, easier to deploy, and safer. It’s also easier to control the swatch of a spreading drone compared to manned aircraft.

Challenges of Drones in Crop Seeding

Regulations

Drone use is regulated in different regions. There are regulations governing licensing, flight heights, payload weights, flight routes, and even specific certifications required for dropping items such as chemicals or seeds using drones. This limits where drones can be used.

Payload Capacity

While the drones we have nowadays can carry up to 100 kg, this payload may not be feasible for seeds that need to be applied at several kilograms per hectare. For instance, cover crops like rye and clover have relatively small seeds, and drones have been used to spread them several times. However, some cover crops like beans have very large seeds, making it impractical to use drones for seeding them..

Varying Seed Size and Type

Seeds come in different sizes and types. Although spreading systems for different seeds exist, they may not be effective for all kinds of seeds. This also makes it difficult when you want to plant different seeds simultaneously, since they may have different application rates or need different spreaders.

Weather

The weather is a significant challenge for drone operations. Wind, for instance, can affect the accuracy of spreading. Strong winds can scatter the seeds farther than you need to. Precipitation, such as rain or snow, can also damage the drone’s internal components, compromising its integrity and lifespan. You must wait for optimal conditions to fly, and sometimes that may disrupt your cover crop seeding plans.

Uneven Farm Layouts

It’s very difficult to find a flat farm with a regular shape and with no obstructions. Most farms are situated in rugged terrain and feature obstacles such as trees, power lines, and other objects that can interfere with drone operations. The farm’s shape also introduces extra flight planning challenges, requiring a great amount of skill to navigate them.

Drone Cover Crop Seeding Best Practices

Below are some things you can do to get the most out of drone cover crop seeding;

• Choose the right seeds – As already established, not all seeds are suitable for drone seeding. You need to research and determine which crops will work best when spread aerially, and reserve the rest for other seeding methods.
• Test and customize – Don’t take the drone settings at face value, as they may have been tested in different environments than yours. Instead, test different heights, swaths, application rates, and other factors to find the optimal combination for your needs.
• Calibration – Since seeds come in different sizes, shapes, and weights, the best way to spread them all using one drone is to always calibrate before the application process. Failure to do so may lead to significant errors and potential damage to the seeding system.
• Fly in optimal weather – When planning for drone seeding, use drone forecast apps like Dronecast, UAV Forecast, and B4UFly to check the weather conditions. Look for days with calm winds and no precipitation.
• Use imaging data – While you can simply add seeds to the spreader, it would be ideal to collect imagery first and analyze it to gain more insights that could help improve your crops and soils.
• Integrate with other methods – Since drone seeding may not be ideal for all types of seeds, combining drones with other methods has proven to be the most effective approach.

Case Study – Iowa State University

Iowa State University successfully used rones to frost-seed clover. Seeding clover when the ground is frozen is ideal, as it helps the seeds germinate better. However, frozen ground may be a challenge for heavy machinery to maneuver. Drones helped them meet the limited window without disturbing the soil.

Conclusion

Drones have clear benefits for cover crop seeding. They are fast, efficient, versatile, and flexible. However, based on the various challenges we have covered, they may not be suitable for some crops.

Drones are suitable for specific situations, such as when you need to access hard-to-reach areas, plant in standing crops, or when there is limited time available for planting. Still, there are situations where seed drilling is necessary when planting cover crops.

Adopting drone technology for cover crop seeding is not about replacing the other methods. The farmer should evaluate the cover crops they ned to plant, the types of soil, and the needs of both the plants and the soil when deciding between drones and other cover crop seeding methods.