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Early Scottish farmers didn’t use manure to fertilise their fields

Unlike their counterparts in other parts of the British Isles and on mainland Europe, early Scottish farmers didn’t use manure to fertilise their fields.

According to a study published in the journal Antiquity, researchers analysed grains recovered from the 6,000-year-old Neolithic site at Balbridie in Aberdeenshire, Scotland.

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Balbridie is the site of a Neolithic long house situated on the south bank of the River Dee. The site is one of the earliest known permanent Neolithic settlements in Scotland, dating from 3400 to 4000 BC.

Balbridie was first excavated between 1977 and 1981 following aerial photography carried out by the Royal Commission on the Ancient and Historical Monuments of Scotland that identified cropmarks during a dry summer in 1976.

A large quantity of ancient grain was also recovered, which a team of researchers have now studied with stable isotope analysis. A plant’s growing conditions impact the ratios of its carbon and nitrogen isotopes, indicating that the prehistoric farmers at Balbridie didn’t use manure to fertilise their fields.

“The stable isotope analysis revealed very low nitrogen levels showing that the crops were not grown on manured soils,” said lead author Dr Bishop, from the University of Stavanger in Norway, adding “the large size and number of the grains recovered suggest that during this first phase of farming, the soils were productive without the need for manuring.”

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Conversely, previous research on early farms in England, as well as on mainland Europe, has almost always found evidence that crops were grown in manured fields. This shows that during the initial phase of farming in the Neolithic, parts of Scotland were well suited for farming.

However, not all early farmers got to avoid dung duty. The team also analysed the contemporary site of Dubton Farm, Angus, and found manure was used there.

Indeed, manuring eventually became the norm in Scotland. Dr Bishop and the team also analysed later Neolithic farms on Orkney, at the sites of Skara Brae and the Braes of Ha’Breck from c. 3300-2400 BC, and found they were using manure. The team also found the Orkney farmers were using permanent plots in a wider landscape than expected.

“The evidence showed that they grew their crops in permanent fields.,” said Dr Bishop. Other researchers had suggested that Neolithic farmers in Britain farmed small transient fields, frequently moving their plots to new areas of land, or that they were a semi-nomadic population, who did not grow crops every year. However, these results show this was not the case in Scotland.

Dr Bishop added, “At one of the Orkney sites we were also able to show that these early farmers grew their crops over a range of different soils, suggesting they grew their crops quite extensively around the landscape or that different farms were storing their crops in a communal store at the site”

Such wide use of the landscape and potential pooling of resources would also have helped protect against crop failure, an ever-present threat in the harsh environment of Orkney. Ancient farmers were able to develop varied sustainable strategies for different conditions.

“The variability of the cropping strategies identified highlights the adaptability of early farming practices,” said Dr Bishop, noting the range of farming practices they identified across Scotland. This raises the possibility further research in other regions may also reveal a similar diversity. Perhaps many early farmers were able to avoid using manure.

The team hopes such research could also help us in the present: “The potential of stable isotope analysis of cereals for recognising past sustainable (and unsustainable) land use elsewhere across the globe may provide lessons for managing future human impacts on the environment,” said Dr Bishop.


Antiquity

https://doi.org/10.15184/aqy.2022.107

Header Image Credit : Antiquity Journal

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Mark Milligan
Mark Milligan
Mark Milligan is a multi-award-winning journalist and the Managing Editor at HeritageDaily. His background is in archaeology and computer science, having written over 8,000 articles across several online publications. Mark is a member of the Association of British Science Writers (ABSW), the World Federation of Science Journalists, and in 2023 was the recipient of the British Citizen Award for Education, the BCA Medal of Honour, and the UK Prime Minister's Points of Light Award.
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