Regular drone surveys give us a detailed insight into the development of our crops.

Sunflowers and maize are a priority crop for many farmers and the care of crops, especially sunflowers, requires precision work. The survey, conducted by Kiev-based DroneUA, which already has extensive experience in industrial drones and Pix4D software, was designed to provide specialists with several key data points: seed counts, herbicide application schedules, growing season analysis and flower mapping.

Corn in a field

Maize is a valuable crop that benefits from precision farming

Customer: DroneUA

Location: Kiev, Ukraine

Software: PIX4Dfields

Hardware: DJI Phantom 4 Multispectral

Surveyed area: 50 hectares

Processing hardware CPU: Intel(R) Core(™) i7-6900K, RAM: 64 GB

Processing time: 15 minutes

Using precision agriculture technology
There were several outputs and findings that DroneUA wanted to get from this work. They visited the field 4 times at different stages of crop growth to analyze different indicators.

Measuring plant counts with drones

The first survey was to do a plant stand count for sunflowers. Each head of a sunflower is important in getting a successful crop, which will be used for making sunflower seed oil. Using drones to analyze the crops brings a return on investment in terms of providing information quickly that was not previously available.

altLeft altRight

The plant count identifies sunflowers before harvesting season

The first survey was performed in early June, where the quality of sowing was assessed using a drone flight with a high ground-sampling distance (GSD) between 1 and 2 cm. The small GSD provides highly detailed data for analysis. The data was processed with PIX4Dfields where an index calculation developed by DroneUA was used to calculate vegetation with an accuracy between 80 and 90%. The exact number of sunflowers and corn plants in these fields was determined, which allowed the farmer to assess the quality of crops, identify places without seedlings, and get an approximation for the expected yield at harvest to plan for the logistics for later in the season.

Applying herbicides using precision agriculture

Using a drone map to plan herbicide application can prevent unnecessary treatment in a field. Scanning beforehand is done in the tillering stage and stem growth, which happens in the latter half of June for sunflower and corn. At this stage, the height of vegetation is measured and then analyzed to identify the different stages of plant growth as well as spot the impact of weeds in the terrain.

Weed prevalence map
The weeds were identified using the imagery from PIX4Dfields

The data was first processed and analysed in PIX4Dfields before further analysis was carried out using QGIS software to create a weed map and plans for the necessary interventions. The application plan was designed for the local application of herbicides, with the aim of reducing the amount of chemicals in the crop, resulting in a more environmentally friendly farm.

Precision fertilizer application

Fertilizers applied to a field can be damaging to the environment. DroneUA returned to the field in early July to plan for corn and sunflower fertilizer application. They planned to use multispectral data, where different waves of light are used to analyze the state and health of crops.

The multispectral camera surveys are then used to produce zonal maps. This is used to optimise crop nutrition and save the amount of fertiliser applied to the field. By working with drone mapping and multispectral imaging, farmers can save fertiliser and money, and achieve stronger returns in safer conditions.

Flowering stage map and the end of the growing season

At the end of the growing season, the flower buds of the sunflowers are counted to check the stage of development and the level of flowering. The level of growth of the flowers can be used to plan micro fertilizer use and treatment to give them a final boost. Thus, a flowering stage map was created with PIX4Dfields to get this information to plan a treatment regime.

Flowering stage map with drones
The flowering stage map helps in the latest part of the year

Drone mapping in agriculture throughout the year

As a result of working with drone mapping, DroneUA delivered vital information and actionable data to their client. All of the seasonal monitoring with drones and multispectral photogrammetry provided a strong return on investment to the growers because it saved fertilizer, herbicides, and time. They could better plan for harvest as a result of using drone mapping to measure the stage of growth without losing any time or crops.

PIX4Dfields provided key tools for taking raw data and making it actionable. Images from different times of the year were used to calculate reliable index values. Drones and precision agriculture made a difference for these crops without invasive treatment or expensive satellite image analysis.

Forrás: Pix4D