Drones Measure Farm Soil Moisture

Filed under Agriculture, News, Technology - IT - AI ~ by Press on  24 Feb 2019

As severe drought devastates Australia’s farms, drone-based soil moisture mapping can reduce and optimise irrigation.

Soil moisture knowledge can also help farmers in unirrigated broad-acre agriculture to determine areas where seed-laying could succeed or fail.

Traditional decision-making involved expensive aircraft or satellite mapping, spot checks via physical assessment, instrumentation (such as tensiometers), or even guesswork based on traditional knowledge of their property – all of which are ultimately haphazard compared to a site-specific, high-resolution drone reconnaissance.

Monash University Professor Jeff Walker’s research team has developed a drone-based autonomous soil moisture mapping system.

Field experiments used optical mapping to determine soil moisture levels in the near-surface. Drone data makes a map of ground soil moisture levels to decide how best to irrigate a paddock.

Both optical mapping and passive microwave sensing technology using L-Band waves are employed, with research on the potential for using P-band waves that might measure up to 15cm into the soil, unimpeded by vegetation and tillage features. 

Testing was in two farms in regional Victoria and Tasmania, one a dairy farm using a centre pivot irrigator, the other a crop farm using a linear shift irrigator.

We need to produce 60% more food with the same amount of land and water, and we can only achieve this by being more efficient with the water we use through irrigation,” Professor Walker, Head of Civil Engineering at Monash University, said.

We need to know how much the crop needs, how much moisture is already there and apply just the right amounts of water in the correct places to avoid wastage while keeping the crop at its peak growth.”

Good soil moisture allows for the optimal growth and yield of crops, while at broader spatial scales also regulates weather, climate and flooding. The water levels in the soil controls evaporation over land and thus the energy fluxes into the atmosphere. This drives the atmospheric circulation, which drives climate.

If the soil is too dry, crops can fail due to a lack of water. But if the soil is too wet, crops can not only fail but pests and diseases can flourish,” Professor Walker said.

Professor Walker said the farming industry has welcomed smarter and more automated practices, but there are few tools available to make the already difficult workloads of farmers more manageable.

At best, farmers might have a single soil moisture sensor in a paddock, but this doesn’t allow for the optimal application of water, especially as this resource becomes scarcer. Plus it won’t take into account moisture variation levels across the individual paddocks,” Professor Walker said.

As crop failures due to a lack of water have enormous human and financial consequences, Professor Walker said Australian farmers need to become more efficient in soil moisture mapping by using ‘precision agriculture’ methods such as autonomous soil moisture mapping using drones.

Farmers also need to cooperate; water conservation and efficiency is a collective responsibility. Everyone needs to do their part to use water more effectively or we’re at risk of running out completely,” Professor Walker said.

As the world’s driest continent facing climate change, a growing population and a greater demand for food, water conservation should be one of Australia’s top priorities.”

This project is part of Monash University’s expanding interdisciplinary focus on the use of data and technology to solve real-world problems for today and in the future.

The Autonomous Drones for Soil Moisture Mapping project was funded by Monash Infrastructure through a seed funding scheme. This project forms part of Professor Walker’s wider research into soil moisture mapping and autonomous farming. Watch this project in action here.

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