gs – Page 14 – Living Field

Turnip strudel – a Croatian version

Turnip strudel is a typical strudel in the Međimurje County in northern Croatia …. writes Paula Pongrac …. where my parents are from. Also, very popular are cabbage and pumpkin strudels.

All the ingredients (turnips and walnuts, or cabbage and pumpkins) were available even in times of scarcity and were typically made when there were not enough apples or cottage cheese (these two versions of strudels are more common in Slovenia and Austria).

Here is how you make a turnip strudel:

Ingredients (are not to measure so the strudel tastes different every time):
Turnip
Walnuts (ground)
Sugar
Filo pastry
Sour cream
Butter
Oil

Peel and grate one large turnip. Place it in a bowl with salted water and bring to boil. Simmer for 10-15 minutes. Drain it so you get rid of all the water. (When cooled you can use hands to squeeze it). You can stop at this stage and freeze it for later.

Otherwise or when defrosted, put some oil in the pan and place the drained turnip onto it, add sugar and ground walnuts and fry for some time, mixing frequently. Make sure, the walnuts and sugar are evenly mixed with the turnip. Cool the filling down.

Spread Filo pastry (two or three layers), sprinkle it with some oil and add the turnip-walnut filling. Roll it and place into buttered oven-proof pan. Repeat until you run out of Filo pastry layers and the filling. Spread sour cream over the Filo pastry and bake it until golden on the outside.

Cool the strudel down and enjoy.

Recipe by Paula Pongrac

Paula’s captions for the photographs above (top left clockwise): ‘walnut trees are very common’; ‘…. or just for a pet’; ‘fruit trees make the area colourful and pretty’; manmade streams for field drainage’.

2 veg to pellagra

And following Cornbread, peas and black molasses and Peanuts to pellagra …. another way to avoid pellagra and other debilitating deficiencies in the diet is to taste and enjoy the sheer variety of fresh vegetables on display and for sale at our best local food markets.

Here is one held at a square in the town of Carcassonne, in the south of France, a few minutes walk from the Citadel.

It was well attended by locals, discerning or knowing in their choices, and by a few visitors, envious of the variety and freshness.

Here were the very fresh and short-lived leaves that need to be eaten today or tomorrow, others with tougher outsides that will keep a few days and still others like the onions, chestnuts and chillies that will keep for weeks or for months if treated right.

And below is similar produce from markets near Yangon in Burma. There’re maize cobs at the top left, on the same stall as pumpkins (also as Carcassonne). And for sale nearby is a diversity of green matter that you rarely see in Europe.

All parts of the plant are eaten – seed (the germinated bean sprouts), leaf, whether fresh or part cooked or pickled, then roots, root and stem tubers, various reproductive parts (tomato and chillies) and things unidentified. Nuts and grain legumes were also on display.

There are similarities in the produce offered at these two markets thousands of miles apart. They both offer this wide range of ‘keeping’ time. There are no ‘sell by’ dates! But people still know how long things last before they go off.

In well nourished societies, fresh produce is balanced with storable grain that will sustain families over drought or frost. Of the grains, cereal (corn) grain gives energy whereas legume or pulse grain (peas and beans) gives more protein.

Yet the offering for sale of grain is where markets like those near Yangon and Carcassonne differ. Much less storable grain – cereal or legume – is on display in Europe than in south east Asia. Notably there is hardly any ‘short food chain’ grain for sale in local markets in Europe. Most of our grain is sourced globally and is highly processed.

In the north of the UK, for example, the most that the discerning home-buyer will see is a bag of locally grown oatmeal. And if in Orkney, you might strive to find a bag of bere meal (bere is a barley landrace). And who now sells storable, dried, peas and beans?

There will be more on the balance end tension between cereals, pulses and veg …..

Contact: geoff.squire@hutton.ac.uk

Peanuts to pellagra

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.

Further

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

Links on this site: Cornbread, peas and black molasses, Feel the pulse

Contact: geoff.squire@hutton.ac.uk

Cornbread peas and black molasses

During his session at the Dundee Jazz Festival, at the Frigate Unicorn on 18 November, Mike Whellans performed the blues classic Cornbread, peas and black molasses. Memories…

Made popular in folk and blues clubs this side of the Atlantic by Sonny Terry and Brownie McGee, it was a work song – forced work – a complaint on a monotonous diet. The song leads back to a dark history, but also to an enlightened discovery of the cause of a serious dietary deficiency that was thought to be an infectious disease.

The constituents

Cornbread is made from maize flour (maize is corn in the Americas) and black molasses from cane sugar (known as black treacle here). So that’s two members of the grass family, originally accompanied by fatty preserved meat, constituting the food of slaves, chain gangs and many rural poor. In fact, the words go Cornbread meat and black molasses in some versions of the song.

Not a healthy diet therefore and the cause of the disease pellagra, a deficiency in the vitamin niacin (B3 or nicotinic acid). Symptoms include sores covering large areas of the skin, vomiting, diarrhoea and eventually dementia.

At some point ‘peas’ entered the title, but they would probably have made little difference to the prevalence of the disease unless they were fresh.

Pellagra and niacin deficiency

The discovery by Joseph Goldberger in the USA that pellagra was a vitamin deficiency was a victory for logic and experiment over presumption and superstition. (See the links below under Sources.)

So where does the vitamin niacin come from. It is made in plants. They take up minerals from the soil and with the products of photosynthesis, make, for their own purposes, what we know as vitamins.

The deficiency has been associated with areas that consume maize (or sorghum) as the main staple carbohydrate, notably in the south of the USA, but including parts of southern Europe in the 1700s. Maize contains niacin, but not in a form readily available to humans.

A note on the Linus Pauling Institute’s page on niacin reads: “Interestingly, pellagra was not known in Mexico, where corn was also an important dietary staple and much of the population was also poor. In fact, corn contains appreciable amounts of niacin, but it is present in a bound form that is not nutritionally available to humans. The traditional preparation of corn tortillas in Mexico involved soaking the corn in a lime (calcium oxide) solution, prior to cooking. Heating the corn in an alkaline solution results in the release of bound niacin, increasing its bioavailability.’

Foods rich in niacin include pulses such as peas and groundnut (peanut), some fresh fish and meat, wheat bread, green leafy vegetables and fruits; and it’s this sort of food that the poor or enslaved pellagra victims did not get.

Sources

Pellagra and niacin

Linus Pauling Institute, Oregon State University: Niacin
http://lpi.oregonstate.edu/mic/vitamins/niacin

Poverty, slavery and the discovery of dietary deficiency

Middleton J. 2008. Pellagra and the blues song ‘Cornbread, meat and black molasses’. Journal of the Royal Society of Medicine 101, 569-570. Also Middleton J. 1999. The blues and pellagra: a public health detective story. BMJ 319, 7218.

National Institute of Health Office of History (USA) Dr Joseph Goldberger & the war on pellagra.

US Slave blogspot http://usslave.blogspot.co.uk/2012/01/slave-diet-low-in-niacin-causes.html (Note: includes images of people afflicted by the disease)

Singers and songs

Mike Whellans web site: http://mikewhellans.co.uk/biography.htm

The Mudcat Cafe (discussion forum on trad songs): Cornbread peas and black molasses.

Worksongs.org http://www.worksongs.org/blog/2013/01/25/cornbread-and-peas-black-molasses

See Worksongs.org link above or search U-tube for the song title + Sonny Terry & Brownie McGee, Johnny Silvo or Mike Whellans.

Links to other livingfield pages that touch on slavery: Empire at Wall projects II Montrose; It was slavery days.

Ed: first heard Cornbread peas and black molasses sung by Johnny Silvo quite some time ago, but no idea at the time what cornbread and molasses were. Good, also, to listen to Mike Whellans again. He played for a time with Ali Bain on fiddle, touring the folk clubs in the 1980s; never forget their versions of Sweet Georgia Brown and Jimmy Clay (on a vinyl LP called Ali Bain – Mike Whellans).

Great venue, the Frigate Unicorn – an upper room stretches almost the whole length of the ship.

Contact: geoff.squire@hutton.ac.uk

Sectioned II

Our artist friend, Jean Duncan has been trying out new techniques, getting inspiration and materials from the Living Field garden and from microscopic sections of roots. Jean writes about her depictions of brassica roots:

“The print is an etching made on a zinc plate by drawing with a needle into soft wax and then etching the lines in copper sulphate. Ink is rubbed in to the etched lines and then printed on wet paper.

“My idea is to print root sections and plant drawings on to plant papers. I want to combine ancient techniques of papermaking with the latest microscopic images in a way that will highlight the plant’s diversity and engage people in how plants can enrich soils as well as provide food.

“For papermaking, the most successful fibres so far have come from maize stalks from the Living Field garden. These are chopped and simmered for several hours in soda ash to break down the fibres. The long fibres are then bashed further in a Hollander beater like a large grinder. Sheets of paper are then formed on a mould and stacked for printing or casting. Wet paper sheets can be pushed into plaster moulds of the plants and roots and when they dry the plant is embossed into the paper.

“So it’s a long process but I am currently working on a latex cast of a plant root and it’s been successful so far. It may even be useful to scientists as a way of preserving the fragile roots in a way that means they can be handled without being damaged.

Sources/contacts

Jean Duncan on this web site (with links): art/jean-duncan

The original microscopic cross section of a root was provided by Robert Baker of the Department of Botany, University of Wyoming. [Ed: the original links given for this image are no longer active but are retained for reference – http://www.robertlbaker.org and http://www.macromicroscopic.com ]

Here it is.

And thank you for allowing us to use it on this site.

[More to follow from Jean’s experimenting ….]

Sectioned

Through a brassica root by Jean Duncan based on micrograph by Robert Baker. More at Sectioned II …

Winter flood … continued

The floods this past winter of 2015/16 were spectacular, lakes appearing where there were fields and swollen rivers coursing through the landscape. The soil was saturated for months and crops were damaged.

It was difficult to predict at the time the loss of grain yield at harvest. If a winter crop fails, farmers may switch to another crop such as the hardier oat. Or they may sow oat in spring instead of spring barley; or even not sow a grain crop at all. Only the ‘good’ crops might appear in the census. The trouble caused by the flooding might appear less than it was.

The first reliable indication is after harvest when the first estimates of the year’s yield are tabled. In 2016, the first estimates were published on 6 October and they suggested a smaller drop in yield than perhaps expected, smaller than the one following the floods in 2012. But we’ll wait until the final estimates are out in December 2016 before making final comparisons with that year.

Here for reference (Figure 1) is a graph of national average yields each year from 2000 for the main grain crops, spring barley and winter wheat. In Figure 1, yield in units of tonnes per hectare (weight of grain per hectare of land, a hectare being 100×100 m) is shown in comparison with the average over the period represented by the dashed lines. Winter wheat yields more than spring barley, but the drop in 2012 is clear for both.

In Figure 2, the yields are shown as a percentage of the average (the heavier line at ‘0’ on the vertical axis). Both crops go up about the same and down about the same each year, but the drop in 2012 was bigger than anything like this in the last two decades. The wet cloudy year of 2002 also showed a fall in yield. Compare these with high yield of 2014 when the warm, sunny summer allowed the grain to bulk to a record for recent times.

Despite all the advances in machinery and crop varieties, farming in the north east Atlantic croplands is still very much at the mercy of the weather. Maintaining soil is good condition will be essential for future yields.

Further information and photographs of the 2012 floods on the Living Field web site at The late autumn floods of 2012.

Sources

First Estimate of the Cereal and Oilseed Rape Harvest 2016. Scottish Government. Published 6 October 2016. Link to a downloadable PDF file.

Neep

Painted in the Living Field Garden on 6 October 2016, by Jean Duncan.

Jean captures that solidity of the red-brown tuber, the arching leaf-stems and the straggle and mush of leaf-blades, grey-green and splattered with soil.

It’s the grey-green colour of the leaves and the yellow tinge to the cut tuber that distinguish the neep, swede or swedish turnip from the other turnip. The same Brassica napus as the oilseed rape it is, but a variety that puts its energy into the tuber and not into oily seeds.

This and the other turnip Brassica rapa – the one with hairier, bright green leaves and white flesh – were one of the main supports to agricultural improvement in the 1700s, a living food for people and animals through much of the winter.

Swedes and other fodder crops of the cabbage family are still grown in gardens and fields, but not so much as they used to be. Stockfeed comes in tubs, made of soya, from the Americas.

Today the yellow mash of the neep goes with haggis and tatties to make the burns supper, and the tuber is sometimes still carved on the last day of October, the eve of All Hallows, into a lantern.

But those who know still value neeps as a prime vegetable, healthy and nutritious with a fine taste – anytime.

More on neeps

Ingredients of the Burns’ Supper – SoSCOtchBOnnet

Part of the Brassica complex – its minor role as a weed and feral plant

Festivities around the November cross-quarter day – XQ4

Fixers 3 Crimson clover

Third in a series on nitrogen fixing legume plants.

The crimson clover Trifolium incarnatum ssp incarnatum was once grown widely in the south of Britain and trialled in the north, where it never found favour as a forage ley compared to the white and red clovers. So a small field of mixed legumes in Tarbat, a few miles south of Portmahomack, was unusual.

Crimson clover was the most visible of the plants, in full flower late September, but the patch also contained red clover, two white- flowered clovers and a few other plants. On its margins a stray sainfoin appeared, probably a relic from a previous sowing.

Crimson clover was noted in Lawson & Son’s Vegetable Products of Scotland (1852). They report that, if sown in autumn, it can be cut in June the next year ‘…. and the land fallowed for wheat or spring corn’. They report that is makes a valuable green food for cattle and when cut in full flower ‘it makes a more abundant crop, and a superior hay to that of common clovers, at least it is more readily eaten by horses’.

They also report a comparison of ‘common crimson clover’, a variety of it named ‘late-flowering crimson clover’ sourced from Toulouse in France, and Moliner’s clover which was said to be grown in France and Switzerland. The late flowering variety came out top.

In modern taxonomy, the only one of these native to Britain is now called long-headed clover Trifolium incarnatum ssp molinerii, white-flowered, but that is found at only a few coastal sites in the south of Britain. This is likely to be the same as the Moliner’s clover mentioned by the Lawsons, but their seed was most likely sourced from European seedsmen rather than from the wild in Britain. Crimson clover is now Trifolium incarnatum ssp incarnatum. Moliner’s and crimson are therefore considered sub-species (ssp) of the same species.

So what was it doing here? It was probably sown in a clover mix as a legume contribution to CAP Greening measures (see Sources). As can be seen the mix was luxuriant in foliage and flower well into autumn, when many other wild plants were dying or seeding.

Tarbat is a rich agricultural region, and you can see why the Picts farmed and established their monastery and unique monuments here over 1000 years ago. Today, small fields and patches like the one shown offer refuge and food for insects and birds in a landscape dominated by grazing land, and harvested or ploughed fields.

Sources

Peter Lawson and Son. 1852. Synopsis of the vegetable products of Scotland. Edinburgh: Private Press of Peter Lawson and Son

Mixtures for CAP Greening and also crimson clover alone: Cotswold Seeds https://www.cotswoldseeds.com/seed-info/greening-and-cap-reform

Taxonomy from: Stace C. 1997. New flora of the British Isles 2nd Edition.

Links to legumes on this web site:

Contact: geoff.squire@hutton.ac.uk. Images are the property of the Living Field project.

Great quantities of aquavitae II

The store-house of Foulis; more from the Andrew Wight on his journey north of the Cromarty Firth in 1781; improvement and innovation in 1700s farming; feeding oxen and horse; ‘a man of enterprising and comprehensive genius’; bere and barley.

In ‘Great quantities of aquavitae‘, the farmer-traveller Andrew Wight commented in 1781 on the denizens of Ferintosh, on the Black Isle, who “utterly neglecting their land, which is in a worse state than for many miles around” preferred to spend their time distilling bere (barley) malt than tending soil and growing crops.

Among places supplying grain to the Ferintosh whisky trade in the 1780s was (he reported) the farmland of Foulis (also spelled Fowlis), on the opposite, northern, side of the Cromarty Firth. Mr Wight rode his horse the long way round, but now Foulis is only a few minutes drive from Ferintosh over the bridge.

The Store-House of Foulis

Andrew Wight did not write about the girnal or store-house at Foulis Ferry Point. It was built 1740, that is 40 years before he passed by on his journey north from Inverness (and that’s about 275 years before now). It was built to store grain before it was shipped off to market or paid to people in kind for work or favours.

The grain was grown by the estate or paid as rent by the tenants of the estate. They would grow grain on a farm or allotment and pay some to the landowner. Beaton (1986) reports accounts that the total barley received at the Store-House of Foulis in 1784 came to to 169 bolls two firlots. Example of payments ranged from 98 bolls one firlot from the tenant of Mains of Foulis to two bolls from a slater.

The Store-House of Foulis (map reference NH 599636) today has been well restored, with its fine slate roof and well harled walls (images above). Though sometimes called Foulis Ferry Point, the ferry ceased to operate in the 1930s. New buildings have grown around the site housing a visitor centre, restaurant and shops.

There area is rich in these store-houses or girnals as they were called, along the Cromarty Firth and up to Portmahomak. Beaton (1986) gives a map of locations.

Andrew Wight’s comments on the area

Mr Wight (IV.I p 241 onwards) writes about the crops, the farm animals, the owners, the improvers, the tenants and the peasants. Here are some excerpts from his journey along the north side of the Cromarty Firth from Fowlis eastward.

Of Fowlis (Page 233), he regales against the old practices – “having a baulk between every ridge, upon which were heaped the stones removed from the ridges; the soil was taken off every third ridge, in order to ameliorate the two adjacent ridges; and the crops alternately oats and bere; and to this bad practice was added the worst ploughing that can be conceived.” But after the land was improved by the then owner, he reports (page 235) a wheat yield of ten bolls per acre.

And on the same estate, Robert Hall, the farm manager of Fowlis ‘introduced a crop, rare in Scotland and an absolute novelty in the north, which is carrot. (…..) The farm-horses are fed on carrots instead of corn; and they are always in good condition.”

I rejoice to see six yoke of oxen

At Novar he remarks on the poor inherent quality of the soil, which is more than compensated by the desire of the estate to effect improvement to a degree that today would be thought of as ecological engineering.

He notes “Oxen only are employed both in cart and plough. I rejoiced to see six yoke of oxen in six carts, pulling along great loads of stones, perfectly tractable and obedient to the driver. They are all in fine order, and full of spirit. They begin labour at five in the morning, and continue till nine. They are then put upon good pasture, or fed with cut clover, till two; when a bell is wrung, and all are ready in an instant for labouring till six in the afternoon.’

At Invergordon, he comments on seven crops: “wheat on this strong land was very good; barley after turnip excellent; beans and peas are never neglected in the rotation; oats in their turn make a fine crop; the old pasture grass excels.”

Agriculture, manufactures and commerce, the pillars that support the nation

Several pages are devoted to the contribution of George Ross of Cromarty, MP a man of “enterprising and comprehensive genius”. He started a hemp manufacturing company employing many people and exporting coarse cloth to London and then a brewery for strong ale and porter, much of it “exported to Inverness and other places by sea-carriage”.

On Ross’s agriculture: “it is wonderful to see barren heath converted into fertile cornfields; clover and other grasses rising luxuriantly, where formerly not a blade of grass was to be seen; horse-hoed turnip, and potatoes, growing on land lately a bog; ….. hay, not known here formerly, is now the ordinary food of horses and cows”. He also cures and exports pork: “… he carried me to a very large inclosure of red clover, where there were 200 hogs of the great Hampshire kind feeding luxuriously.”

Ross works on a plan for improving the harbour and entertains “sanguine hopes that government will one day establish a dry dock near the harbour for repairing ships of war in their northern expeditions.”

Ed: Writing in 1810 after Ross’s death, Mackenzie (1810) states that the hemp trade was “now in a flourishing state. From (the year beginning) 5 January 1807, there were imported 185 tons of hemp; and about 10,000 piece of bagging were sent to London”. Ross was not so far off in his hopes for ship repair – Mackenzie refers to a ship being built there in 1810, and today there are deep anchorage and rig maintenance.

Eight fields, eight crops in sequence

Later on page 257, Wight comments on Mr Forsyth of Cromarty who manages a small farm divided into eight fields, and cropped as follows: “First potatoes, horse and hand hoed, with dung; second, barley; third, clover; fourth, wheat; fifth, peas; sixth, oats or barley, with grass seeds; seventh, hay; eighth pasture. … in this way ‘kept in excellent order, with the advantage of dung from the village”.

Throughout his journeys, Andrew Wight speaks his mind, always ready to praise good farming and condemn poor practice. (You can sense these journeys are more than a job.) And while he accepts the social divides of the time – he was commissioned by the wealthy – notably between the landed gentry and their peasants, he condemns those of the former who ignore, ill treat or exploit and praises those who support and encourage the people to improve their lot by agriculture, manufactures and commerce.

Other points to note are that legume crops (fixing nitrogen from the air) were common in crop rotations and that bere and barley are both mentioned but no clear distinction is made between them (see link to the Bere line below).

Sources

Beaton, E. (1986) Late seventeenth and eighteenth century estate girnals in Easter-Ross and South-east Sutherland’, In: Baldwin, J R, Firthlands of Ross and Sutherland. Edinburgh, pages 133-152. Available online: http://ssns.org.uk/resources/Documents/Books/Ross_1986/09_Beaton_Ross_1986_pp_133-152.pdf

Mackenzie, G S. 1810. General view of agriculture of the counties of Ross and Cromarty. London: Phillips.

Wight, A. 1778-1784. Present State of Husbandry in Scotland. Exracted from Reports made to the Commissioners of the Annexed Estates, and published by their authority. Edinburgh: William Creesh. Vol IV part I. (See Great Quantities of aquavitae for further reference and web links).

More on the Foulis girnal

Canmore web site. Foulis Ferry, Granary. https://canmore.org.uk/site/12905/foulis-ferry-granary Notes on history with references.

Am Baile web site: Foulis Ferry http://www.ambaile.org.uk/detail/en/20423/1/EN20423-foulis-ferry-near-evanton.htm

Images

Those in the upper set were taken of the Foulis Store-house and its surrounds on a visit in August 2016.

There were no ‘yoke of oxen’ around Foulis and Novar in 2016, so the Living Field acknowledges with thanks use of photographs from Burma (Myanmar) by gk-images, taken February 2014 (permission granted by the handler to take the photographs). The quotes below the images come from Wight’s text of 1784, and apply well to this magnificent animal).

Links to posts on this site

More from Andrew Wight on his travels in this region: Great quantities of Aquavitae and Great quantities of Aquavitae II.

The distinction between barley and bere: The bere line – rhymes with hairline and Landrace 1 – bere.

Maps of potato. legumes and vegetables in the region in the twenty-tens (and the relevance of this land over the last 2000 years?): Can we grow more vegetables?

Contact: geoff.squire@hutton.ac.uk