Amy Bogaard

Crop manuring and intensive land management by Europe’s first farmers

The spread of farming from western Asia to Europe had profound long-term social and ecological impacts, but identification of the specific nature of Neolithic land management practices and the dietary contribution of early crops has been problematic. Here, we present previously undescribed stable isotope determinations of charred cereals and pulses from 13 Neolithic sites across Europe (dating ca. 5900–2400 cal B.C.), which show that early farmers used livestock manure and water management to enhance crop yields. Intensive manuring inextricably linked plant cultivation and animal herding and contributed to the remarkable resilience of these combined practices across diverse climatic zones. Critically, our findings suggest that commonly applied paleodietary interpretations of human and herbivore δ15N values have systematically underestimated the contribution of crop-derived protein to early farmer diets.

‘Garden agriculture’ and the nature of early farming in Europe and the Near East

This paper takes a comparative approach to early farming, arguing that bioarchaeological work on Neolithic Europe can inform understanding of earlier cultivation and herding in the Near East, where the ‘package’ of crops and livestock emerged in the PPNB period. Evidence for intensive cultivation (‘garden agriculture’) integrated with small-scale herding is outlined for south-east and central Europe before turning to crop and caprine husbandry practices during the PPNB. It is concluded that integration of small-scale cultivation and herding during the PPNB facilitated the spread of agriculture to Europe.

Integrating botanical, faunal and human stable carbon and nitrogen isotope values to reconstruct land use and palaeodiet at LBK Vaihingen an der Enz, Baden-Württemberg

In this paper we reconstruct the palaeodietary setting of LBK Vaihingen an der Enz, south-west Germany (later sixth millennium cal. bc) using δ13C and δ15N values of human and faunal bone collagen and of charred plant remains from cereal crops (e.g. emmer and einkorn wheat) and pulses (lentil and pea). Our examination of this Neolithic dietary ‘food web’ incorporates crop δ15N values within a linear-mixing model to examine the estimated proportions of animal and plant protein in the human diet. We interpret the stable isotope dietary model outcomes together with accompanying archaeobotanical and zooarchaeological evidence to shed light on the role of crops in land use strategies and human diet, and conclude that (manured) crops probably formed the dominant protein source.

Identifying the intensity of crop husbandry practices on the basis of weed floras

A question of broad economic and social significance is the extent to which farming in prehistoric times, and perhaps even in historical times, was characterised by cultivation on a small scale and with intensive methods. Archaeobotanically, a distinction may be possible between intensive and extensive cultivation on the basis of the weed seeds associated with ancient grain samples. To this end, an ecological study was carried out in central Ewia of the weeds of winter-sown pulses grown both intensively in gardens and extensively in fields. The recorded weed flora was demonstrably influenced by relevant husbandry variables, such as method of tillage (with hoe or plough), weeding, manuring and soil organic content. The closest correspondence, however, was with the size, type and location of cultivated plots, suggesting that the weed flora was determined by a combination of these husbandry variables. In conclusion, the potential is briefly discussed of disentangling these variables for application in an archacobotanical context.

Towards a social geography of cultivation and plant use in an early farming community: Vaihingen an der Enz, south-west Germany

Through integrated analysis of archaeobotanical and artefactual distributions across a settlement, the authors discover ‘neighbourhoods’ using different cultivation areas in the surrounding landscape. Differences between groups also emerge over the life of the settlement in the use of special plants, such as opium poppy and feathergrass. Spatial configurations of cultivation and plant use map out the shifting social geographies of a Neolithic community.

Stable carbon isotope analysis as a direct means of inferring crop water status and water management practices

Stable carbon isotope analysis of plant remains is a promising tool for researchers studying palaeoclimate and past agricultural systems. The potential of the technique is clear: it offers a direct measure of the water conditions in which plants grew. In this paper, we assess how reliably stable carbon isotope discrimination can be used to infer water conditions, through the analysis of present-day crop plants grown at multiple locations across the Mediterranean and south-west Asia. The key findings are that: (1) ∆¹³C, as expected, provides an indication of water conditions, (2) even for plants grown in similar conditions there is variation in ∆¹³C and (3) ∆¹³C may reflect crop water status for a period beginning well before the grain filling period. A new framework is presented which increases the robustness with which ∆¹³C values of plant remains can be interpreted in terms of the water conditions in which ancient crops grew.

Stable isotopes in archaeobotanical research

In recent decades the analysis of stable isotopes in plants has become a useful method to infer natural and anthropogenic effects on the growing conditions of plants. Here we present a review of the state-of-the-art regarding the use of stable isotopes in plant macroremains. After providing a brief theoretical and methodological background, we will concentrate on the most common applications developed so far: reconstruction of climate and crop growing conditions, and crop provenancing. Finally, we will discuss current methodological challenges, and potential new directions for research.

Cereal grain, rachis and pulse seed amino acid δ15N values as indicators of plant nitrogen metabolism.

Natural abundance δ(15)N values of plant tissue amino acids (AAs) reflect the cycling of N into and within plants, providing an opportunity to better understand environmental and anthropogenic effects on plant metabolism. In this study, the AA δ(15)N values of barley (Hordeum vulgare) and bread wheat (Triticum aestivum) grains and rachis and broad bean (Vicia faba) and pea (Pisum sativum) seeds, grown at the experimental farm stations of Rothamsted, UK and Bad Lauchstädt, Germany, were determined by GC-C-IRMS. It was found that the δ(15)N values of cereal grain and rachis AAs could be largely attributed to metabolic pathways involved in their biosynthesis and catabolism. The relative (15)N-enrichment of phenylalanine can be attributed to its involvement in the phenylpropanoid pathway and glutamate has a δ(15)N value which is an average of the other AAs due to its central role in AA-N cycling. The relative AA δ(15)N values of broad bean and pea seeds were very different from one another, providing evidence for differences in the metabolic routing of AAs to the developing seeds in these leguminous plants. This study has shown that AA δ(15)N values relate to known AA biosynthetic pathways in plants and thus have the potential to aid understanding of how various external factors, such as source of assimilated N, influence metabolic cycling of N within plants.

Arson or Accident? The Burning of a Neolithic House at Çatalhöyük, Turkey

Abstract This paper presents the results of interdisciplinary research on the recently excavated Building 52 at the Anatolian Neolithic site of Çatalhöyük. This building provides the richest combination of faunal, botanical, and lithic assemblages of all those uncovered since work at the site was renewed in 1995. Occupation of the building ended with a high-temperature fire, after which a portion of it was emptied and reoccupied. Our research synthesizes numerous data sets in order to describe the house and its sequence of incineration, modification, and reuse. Particular attention is paid to the intentionality of the burning and its interpretive implications. These data contribute to ongoing archaeological discussions of the nature of house abandonment and the intersection of ritual and domestic lift in early agricultural societies.

Abundance of 13C and 15N in emmer, spelt and naked barley grown on differently manured soils: towards a method for identifying past manuring practice.

The shortage of plant-available nutrients probably constrained prehistoric cereal cropping but there is very little direct evidence relating to the history of ancient manuring. It has been shown that the long-term addition of animal manure elevates the δ(15)N value of soil and of modern crops grown on the soil. We have examined the δ(15)N and δ(13)C values of soil and of the grain and straw fractions of three ancient cereal types grown in unmanured, PK amended and cattle manured plots of the Askov long-term field experiment. Manure increased biomass yields and the δ(15)N values of soil and of grain and straw fractions of the ancient cereal types; differences in δ(15)N between unmanured and PK treatments were insignificant. The offset in straw and grain δ(15)N due to manure averaged 7.9 and 8.8 ‰, respectively, while the soil offset was 1.9 ‰. The soil and biomass δ(13)C values were not affected by nutrient amendments. Grain weights differed among cereal types but increased in the order: unmanured, PK, and animal manure. The grain and straw total-N concentration was generally not affected by manure addition. Our study suggests that long-term application of manure to permanently cultivated sites would have provided a substantial positive effect on cereals grown in early agriculture and will have left a significant N isotopic imprint on soil, grains and straw. We suggest that the use of animal manure can be identified by the (15)N abundance in remains of ancient cereals (e.g. charred grains) from archaeological sites and by growing test plants on freshly exposed palaeosols.