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Farming methods that support nature improve both biodiversity and crop yields, but more extensive measures may require increased government subsidies to become as profitable as conventional intensive agriculture. That is the finding of the first comprehensive on鈥恌arm trials of their kind in the UK, which were led by the UK Center for Ecology & Hydrology (UKCEH) and Rothamsted Research.

The study is in the Journal of Applied Ecology.

This four鈥恲ear study across 17 conventional, commercial farms in southern England not only trialed various agroecological methods but also鈥攆or the first time鈥攖he financial viability for businesses.

It showed that incorporating nature鈥恌riendly practices within farming鈥攁groecology鈥攊ncreases biodiversity, pollination by bees, natural pest control and numbers of earthworms. This boosted crop yield, but the cost of creating the habitats and the loss of some productive land on which to create these habitats affected the profitability of these systems. New subsidies may therefore be required to support farms' transition to sustainable agriculture.

Trialing agroecological methods

Scientists at UKCEH and Rothamsted worked with farmers to co鈥恉evelop the trials using simple management practices within three different agricultural systems on each of the farms:

1. Business鈥恆s鈥恥sual鈥攖ypical intensive agriculture and no nature鈥恌riendly farming.
2. An "enhanced" ecological farming system which involved planting wildflower field margins to provide habitat for bees, beetles and spiders, and sowing overwinter cover crops to capture carbon and retain nutrients in the soil.
3. A "maximized ecological system" which added to the enhanced system by also planting in鈥恌ield strips of wildflowers鈥�"stripey fields"鈥攖o provide 'runways' for beneficial insects to get further into crops, and the addition of organic matter in the form of farmyard manure to improve soil health.

Benefits for nature and farmers

The study found that in the enhanced and maximized ecological systems, there were increased populations of earthworms, pollinators such as bees and hoverflies, as well as natural predators of crop pests such as ladybirds, lacewings and spiders. This reduced populations of pest aphids and snails, and increased the seed numbers and thereby yield of flowering crops like oilseed rape.

There was also higher soil carbon and overall increased crop yields on the farmed area due to healthier soils, greater pollination and natural pest control. The study also found the enhanced ecological system was as profitable as intensive farming, but only due to agri鈥恊nvironmental subsidies.

While the various benefits for biodiversity, soil carbon and yield were greater in the maximized ecological system鈥攚hich included planting in鈥恌ield wildflower strips and buying in farmyard manure鈥攖he study found that the average farm would require increased subsidies to make it as profitable as intensive farming. Though the additional cost can be offset in certain situations because, for example, mixed farms already have free and easy access to manure.

Future鈥恜roofing farms

UKCEH ecologist Dr. Ben Woodcock, who led the study, explained, "Without the introduction of new financial incentives, many farmers will be deterred from adopting agroecological farming practices and systems. This could leave them locked into high input, intensive farming systems and more exposed to the impacts of pesticide resistance, declining soil health and climate change.

"While farmers run businesses that need to be profitable, there is an increasing awareness that more sustainable systems can help 'future鈥恜roof' their farms in terms of soil health, less reliance on pesticides and climate change.

"Agroecological methods are good for biodiversity, food security and, in the long鈥恡erm, provide more secure farm incomes, but habitats can take several years to establish, so agri鈥恊nvironment subsidies are essential to helping farmers transition to these more sustainable systems."

The study authors say demonstrating the effectiveness of agroecological practices to farmers could be a critical step in breaking farmers free from "intensification traps."

Professor Jonathan Storkey, an ecologist at Rothamsted Research, said, "This study confirmed that managing land on farms for wildlife is not in direct conflict with food security but can support sustainable production by increasing yields and reducing pest pressure. These 'ecosystem services' could potentially substitute for chemical fertilizers and pesticides which negatively impact the environment.

"However, our analysis has shown that realizing these benefits will require additional support for farm businesses that currently operate on very narrow profit margins. As input costs increase, however, these agroecological approaches may become more attractive."

Training improves habitat quality

Furthermore, training and increasing experience will enable farmers to get the most out of measures that support nature, like wildflower field margins, for the types of habitats needed to support beneficial insects have very different requirements to crops.

has shown that training farmers in the establishment and management of wildlife habitats improves their quality and effectiveness in supporting beneficial insects like bees.

The agroecological trials (2018鈥�2021) were part of a long-term collaboration involving UKCEH and Rothamsted, partners in research, government and industry, and farmers to develop sustainable, resilient agricultural systems that boost biodiversity and crop production.