The mixed cereal-pulse crop known as mashlum. Decline after 1950 yet still grown in a few fields. The question of crop mixtures in prehistory.
An earlier article Mashlum – a traditional mix of oats and beans  suggested that the mixed cereal and pulse crop known as mashlum had died out in Scotland but no ….. an email from a farmer in Fife, Douglas Christie, confirmed that it was still grown on his farm. Here is a photograph.
Earlier we had related an account from 1925  on the difficulties of growing mashlum and also the benefits. Mr Christie reports that the mixture worked very well, that chemical and nitrogen fertilizer costs were drastically reduced, but that he had to pick the field carefully as some weeds would be difficult to control.
He also overcame some of the problems in sowing and harvesting a mixture reported in earlier accounts from the 1920s. He has a drill that can sow (direct drill) the two crops at the same time and a grain dresser that can easily separate the two crops after harvest,
Since hearing from Douglas Christie, the Living Field has noticed on Twitter that several farmers in the south of the UK are also working with mixed cereal-pulse crops. A further question arose in correspondence as to their antiquity.
Mashlum in the crop census
That mashlum merited a separate chapter in the 1925 Farm Crops  shows how seriously it was taken. It first appeared in the agricultural census  under the heading ‘vetches, tares, beans, mashlum for fodder’ between 1902 and 1919. The category in the census then changed slightly to ‘vetches and mashlum for threshing’ which declined to a low point in 1939 (grey symbols in Fig. 1). Presumably the need for fixed nitrogen during shortages caused vetches and mashlum to increase in area almost 10 times during the war years.
Most of this increase was in mashlum, which in the 1940s and early 1950s became the most widely grown legume crop in Scotland – covering more area than beans and peas – and was listed in the census simply as ‘mashlum for threshing’ (orange symbols in Fig. 1) , that is, grown and harvested for seed. After a few years, it declined again in the early 1950s and had almost died out by 1960. In 1961, mashlum disappeared from the census and any remaining fields were combined with ‘other crops for stockfeeding’ (green symbols to the right of the trace in Fig. 1).
Fig. 1 The area sown with mashlum and related crops in the agricultural census in Scotland, 1902-1978 . Mashlum was listed as a separate item in the crop census from 1944 to 1960 (orange). Before that it was part of ‘vetches, tares, etc.’ up to 1919 (light blue-grey), then vetches and mashlum for threshing (grey). Any crops remaining after 1960 were counted as part of ‘other crops for stockfeeding’ (green symbols).
The period from the late 1950s to the 1980s was the time of rapid increase in the use of mineral nitrogen fertiliser. The cereal-pulse mix became uneconomical.
Despite its temporary revival in the 1940s, mashlum, as all other legume crops, was grown on a small part of the arable surface in the 20th century, generally less than 1% of it.
Cereal-pulse mixtures in prehistory?
A question then arises as to how old is the practice of sowing mixed cereals and pulses. The Dictionary of the Older Scottish Tongue (DOST) finds that mashlum, in the spelling mashloche, was in use more than 500 years ago , but that in itself tells little of the crop’s ancestry. Was the method handed down from earlier Bronze or Iron Age farmers to the medieval period or was it brought over by the Romans or early Christians?
The archaeological record in the north of Britain is thin on peas and beans: there is one record of field beans in Scotland – also known as horse bean and Celtic bean, now faba bean. Peas and beans appear far less frequently than cereal grains, but this difference is often attributed to the methods of cooking them: beans are less likely than grain to be charred and hence preserved. In an authoritative survey beans and cereals were examined in 75 locations in southern England .
At some archaeological sites, beans and cereals, such as emmer wheat, are found together and in numbers that suggest they were both grown as crops for food. Descriptions of the finds at Foster’s Field, Sherborne in Dorset for example, include the line that beans ‘may have been grown as a mixed crop with barley or as part of a crop rotation system’ , a statement repeated in the broader survey .
The archaeologists agree that presence itself does not mean anything definitive about how the crops were grown – whether alone, in broadcast mixtures, or in rotation or sequence. It is not hard to imagine, though, that cereal-pulse mixtures have been used from the earliest times. Imagine a household or village had some cereal and some legume seed, not enough to be sown alone, but together they would make a field.
And the same farmers would have known, as all farmers up to the mid-1950s have known, that cereal and pulses together do better on poor soil than cereals alone because of the nitrogen-fixing ability of the pulses, and if the pulse is faba bean, then also the support offered by the stronger bean stem.
Common sense tells that they would have grown mixtures but there is no definitive evidence.
 Mashlum – a traditional mix of oats and beans posed some questions about the crop grown as a sown mixture rather than a line intercrop.
 O’Brien DG. 1925. The Mashlum Crop. In: Farm Crops, edited by Paterson WM, pages 297-302, published by The Gresham Publishing Company, London.
 Crop census records for the main crops from early in the century to 1978 are available online as Agricultural Statistics Scotland from the Scottish Government web site at Historical Agricultural Statistics. Mashlum is sometimes included with other pulses and forages but is given as a separate crop for the period indicated in Fig. 1 above.
 DOST Dictionary of the Older Scottish Tongue cites the crop in the spelling mashloche from the 1440s at http://www.dsl.ac.uk/entry/dost/mashloche.
 Treasure ER, Church MJ (2017) Can’t find a pulse? Celtic bean (Vicia faba L.) in British prehistory, Environmental Archaeology, 22:2, 113-127, DOI: 10.1080/14614103.2016.1153769. An excellent paper on the occurrence of field bean in Britain.
 Jones J. (2009) Plant macrofossils. In Best J, A Late Bronze Age Pottery Production Site and Settlement at Foster’s Field, Tinney’s Lane, Sherborne, Dorset. Archaeology Data Service 2009: idoi:10.5284/1000076. Many of the source papers on the topic are only available free to academic data services, but this one is available online through the link.
Following a trail ….. starting with a blues song – cornbread, peas and black molasses – sung at the Dundee Jazz festival – and on to chain gangs, slavery and rural poverty, and the peculiar malnutrition caused by a maize-based diet, appearing as the debilitating condition pellagra, and then on to the discovery by Joseph Goldberger that pellagra was not an infectious disease but a dietary deficiency, a shortage of bioavailable niacin ….. and this trail leads to the question of what happens when maize became the staple diet, or at least a major part of it, as the crop spread to Asia and Africa from its origin in central America.
With maize Zea mays as the main corn (grain) and carbohydrate, there has to be other food to provide the missing vitamins – food such as groundnut Arachis hypogaea (usually named peanut in the UK) and other high-protein pulse crops, and fresh green vegetables. And it’s noteworthy that in parts of the tropics, maize is often grown along with pulses such as groundnut, and not just as patches side by side but in intimate mixtures, named intercrops when the two are grown in rows.
The spatial arrangement of the two crops probably matters little for the balanced diet, but the combination, when in rows as in the image above, increases the yield on at least one of them. So there are two products – maize and groundnut (peanut) – which together provide much of a healthy diet, and they yield more from an acre of land if grown together.
The groundnut-maize intercrop shown above was on the margins of the Irrawaddy river in Burma, probably growing on stored nutrients and water left behind as the river receded during the dry season. This example (and there is no one way to grow the two crops together) looked like a long thin ‘field’ of groundnut into which maize was planted in every fifth row.
Research elsewhere on groundnut-maize intercrops shows that in this configuration, the maize yield is ‘free’ or extra, in that it does not suppress the yield from the groundnut.
The images above show maize cobs on sale at a local market and a groundnut harvest spread out in a cloth in the sun to dry. Each pod contains three or four seed (the ‘nuts’ in peanut). A month or two earlier, they were on the plant, but unseen, buried just under the soil, an amazing adaptation that helps to protect the plant’s seeds while they fill and mature.
There are other ways to get essential vitamins in a maize-based diet, but the maize-groundnut mixed crop offers much towards a balanced diet and gets more from the environment than either crop grown alone.
The article Mixed cropping in Burma gives more on crop mixtures, and scientific reference to pulses.
For more on the use of legumes in food: Botanists in the kitchen