Mesología de la terra preta Mesology of the Terra preta

The text presents mesological research about terra preta , a type of soil that, due to its chemical, mineral, and nutritional composition, harbours a higher degree of fertility than the adjacent soils in the Amazon region. This cosmo-geographic phenomenon is of anthropic origin since the studies of its composition indicate the continuous deposition of organic matter from human waste. We consider this modulation of organic matter as a cosmotechnic, one that appeared independently of the technological development of the modern-classical Western paradigm since it presents an alternative technical approach that sits between the moral and the cosmic . Terra preta began to form in the Amazon from the middle of the Holocene and continues to regenerate, behaving as a kind of “super organism”. The present work outlines this eco-social framework, reviewing the available literature on its pedogenesis and the anthropic activity that intervened in it


Introduction
In his chronicle about the discovery of the Amazon River, the missionary Gaspar de Carvajal describes his impressions of the exploration commanded by Francisco de Orellana, that in 1542 crossed the Amazon River encountering large and complex populations. 1 It is estimated that the population of the Amazon at that time was between 5 million and 10 million inhabitants. 2 By 1900, the total population of native inhabitants in the area had been reduced to around 500,000; a reduction caused by the diseases that Europeans had brought to the region, ethnocides, wars, slavery and expropriation of resources. 3 This modest number of inhabitants feed the notion of an environmental determinism, 4 a notion which postulates that the development of a complex society in the Amazon territory was impossible due to the limitations that were presented and to which the native inhabitants could not have adapted: the low fertility of the soils, the lack of technical tools, the supposed lack of protein sources 5 and the frequent floods.
In the Amazon region, often depicted as a "Counterfeit Paradise" or "Green Hell"; the highly weathered, very acidic soils of the terrafirme (upland settings) are thought of as extremely forbidding. With few available nutrients and having extremely high aluminium concentrations, one could not imagine a worse regime for productive agriculture, particularly when associated with nucleation of population. Indeed, even in the varzea (floodplains) with somewhat better soils, crop production has been seen as a risky endeavour because of the unpredictability of the flood regime. 6 Today, few researchers hold this position since multiple archaeological, historical ecological and biochemical research shows that much of Amazonia was transformed by burning, settlement, roads, As I had eventually decided to translate fûdo with 'milieu', and given the lexical sterility of this term in French [...] I searched around the roots of the notion of milieu in Latin (med-) and in Greek (meso-). This work made me discover [...] the existence of a discipline, by now dead and gone, mesology (mésologie), which had been founded as the science of human milieux. 16 Landscape thinking is the way in which each being translates its mediance from his flesh to his actions. 17 By mediance, Berque means "the co-implication of milieu and Being," 18 that is, the "medium character between the physical and the phenomenal, the natural and the cultural, the collective and the individual." 19 In our mesological study of terra preta, mediance refers to "all intentional and non-intentional practices and activities of humans that transform the environment into a productive landscape for humans and other species." 20 In this productive landscape, constituted through the dynamical coupling between human and milieu, terra preta can be understood as a techno-geographic medium in which a multiplicity of functional circles develop, and that belong to the great variety of species that interact with-and are part of-the environment of the region: "...in [the] same environment, different species or cultures will have different milieux..." 21 With functional circle, we refer to the sphere of perception-action of an agent in relation to its environment. This concept was coined by Jakob von Uexkull to understand the ways in which animals execute their actions from the perception (or internalization) of their environment. "Jakob von Uexküll introduced a founding distinction between environment (Umgebung) and milieu (Umwelt). Environment is a raw and universal datum, considered in abstracto by the look from nowhere of modern science, [...] whereas milieu is a concrete and singular reality, [...] dynamically coupled with the constitution" 22 of the being which experiences it. As Berque writes, "what the animal encounters is the 'as' by which he perceives things: as food, as obstacles, as shelter, as housing, etc. In other words, in a functional circle, this 'as' is the medial handle that an object offers the animal..." 23 16 Augustin Berque, "Offspring of Watsuji's theory of milieu (Fudo)", GeoJournal 60, (2004)

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We consider that the concrescence that exists between "the moral, the cosmic and the technical," 27 embedded in the management of resources which generates the terra preta, presents dynamics that diverge from the onto-epistemic configurations that exist within the modern-classical Western paradigm. 28 Following the thought of Gilbert Simondon, we understand terra preta as a techno-geographic constitution, namely, a milieu that appears between the forest and the human, in which each modification is self-conditioned by the result of its functioning. 29 According to Simondon, "invention is the emergence of the extrinsic compatibility between the environment and the organism and of the intrinsic compatibility between the subsets of action." 30 But what is a subset of action? Simondon describes the subsets of action as the relatively independent perceptive images within a living being. Could we then consider that the concretization of the terra preta happens through the encounter of the extrinsic compatibility between the forest and the human, and the encounter of the intrinsic compatibility between the perceptive images of the forest and the human? If we take into consideration that the "forest" and the "human" are constituted through a multiscale interspecies cooperation, it becomes clear that both can be described as "environment" and "organism," depending on the scale of the analysis. Therefore, to approach the emergence of a techno-geographic constitution such as the terra preta, we require a model of invention that happens through interactive enaction. The terra preta is the effect of a multitude of concordant and parallel inventions that emerged in multiple locations of the region, through the modulation of concrete relations and elements. Thus, we could frame it as what Simondon calls "the simplest invention," 31 since its axiomatics do not need to be constructed, because it is the organism itself "who delivers them." In this case "organism" refers to the forest, which, as we will discuss later, goes through a process of phenotypic diversification based on human technicity.
The mesological study of terra preta elaborated in this work is enabled through the existent historical ecological research, a field that "focuses on landscape as the medium created by human agents through 27 Yuk Hui, "Machine and Ecology", 54-66. 28 Berque, "An Enquiry into the Ontological and Logical Foundations of Sustainability: Toward a Conceptual Integration of the Interface 'Nature/Humanity.'" 1: the modern-classical Western paradigm "ontologically founded on dualism and logically on the law of excluded middle, has entailed modernity and industrialization The MCWP is ontologically and logically founded on the principle of decosmization, by means of abstracting our Being from its milieu: (1) ontologically with dualism; and (2) logic-ally with the law of excluded middle, both entailing the reign of Binarity (as exemplarily instanced, nowadays, by the binary 'language' of our electronic devices)."

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their interaction with the environment." 32 Historical ecologists argue that "disturbance caused by human activities is a key factor in shaping biodiversity and environmental health." 33 Through radiocarbon dating of the physical signals of human activity embedded in the landscape, it has been possible to build a historical perspective of up to 11,000 years of the interaction between human and environment in the Amazon. In his text History, Ecology and Alterity (2006), Heckenberger presents a research recollection on the possible modes of social and political organization in the area, exposing a complex and changing heterogeneity over time. The different ethnic groups that have developed in the area have been both nomadic and sedentary, and have had hierarchical and heterarchical organizations, hosting around 300 languages belonging to 170 different families. 34 It has been confirmed that the formation of terra preta is not exclusive to a single cultural group, since different ceramic traditions have been identified in its deposits. 35 We believe that reflecting about this phenomena and the possible ways it can be extrapolated, can contribute towards the resolution of several socio-ecological problems of late modernity.

Pedogenesis
Approaching soil as infrastructure makes it appear as a highly lively entity. Not only living memories of the discarded and of past organisational settings are archived and processed in it, but labours invisible to most humans: of earthworms, fungi, microorganisms etc. 36 The soils of the Amazon region are usually unfertile, due to the high decomposition rate of organic carbon (C), rapid losses of nitrogen (N) and potassium (K) through leaching, and rapid phosphorus (P) fixation to (hydr-) oxides of iron (Fe) and aluminium (Al). 37 As described above, this data on the Amazon region informed the positions of environmental determinism. But the terra preta deposits usually occupy limited areas, and they are even not usually shown on soil maps of the Amazon, 38 therefore regional 32 Erickson, "Amazonia: The Historical Ecology of a Domesticated Landscape,." 158.    or continental depictions are not appropriate, "one needs to look at the microscale and here one finds great variety in and enormous pre-Columbian modifications to the soil landscape." 39 In pedology, the soil is understood as a "natural-historical body, resulting from the collective influence of (a) subsoils, (b) climate, (c) flora and fauna, (d) geological age, and (e) relief of the locality." 40 In this discipline, the relationships between organisms are manifested as digestive mutualisms, which occur between agents of different scales. These types of mutualistic relationships are called anisosymbiotic (aniso means unequal) due to the difference in size of the related organisms, to the transitory or temporal character of these associations, and to their exhabitational character, meaning that their contact is physical rather than organismic. 41 Although in the study of soil formation, "macro-organisms" refers to worms or to the roots of a tree, in the case of terra preta, humans also fall into this category. Anisosymbiotic mutualism between organisms is a key factor in the function of soils. Decomposition and turnover of organic matter, and maintenance of the soil structure, are determined by the nature and effectiveness of these mutualistic relationships, 42 allowing organisms to make use of resources that they could not digest with their own body.  Ecosystem engineering refers to the process in which organisms "directly or indirectly modulate the availability of resources to other species by causing state changes in biotic or abiotic materials. In doing so, they modify, maintain and/or create habitats." 43 Worms, for example, collaborate in soil engineering by ingesting organic matter and minerals, adding them chemically through their digestion, and causing aeration through their movements, creating structures that allow the growth of other organisms. 44 The organisms as ecosystem engineers are divided into two main categories: (1) autogenic engineers, organisms that change their environment through their own physical structure (e.g. digestion), and (2) allogeneic engineers, organisms that alter matter through processes external to their body (e.g. use of tools). "The boundaries between types of engineering are occasionally fuzzy," 45 as in the case of the type of engineering that humans undertake in relation to the terra preta.
The garbage of the people who lived in the Amazon region was very important for the increase in organic matter in the soil and also for its calcium (Ca), magnesium (Mg), zinc (Zn), manganese (Mn), phosphorous (P), and carbon (C) enrichment. 46 Herbert Baldus mentions that the Kayapó "do not fear much the dirt, nor on their bodies nor in their houses nor their belongings. The major part of the trash, for this reason, is left where it falls, if it does not happen to be of interest to dogs and other animals that roam around and inside the houses". 47 Trash is randomly discarded around the habitations, in some cases forming mounds. 48 Funeral practices also increase certain chemical elements in the soil, mainly calcium (Ca) and phosphorus (P). "At present, various tribal groups bury their dead inside their own houses or in the village center" (Kern et al. 2004). Some groups cremate their dead, and leave the ashes at the place of cremation, others simply abandon the house or the village, leaving the dead in the hammock, or put fire to the house. 49 Simöes mentions that some pre-Columbian groups "dislocated and buried many times their dead in funeral urns which were deposited inside the village", 50 and in her study of the Krahó, Carneiro da Cunha mentions burials in rectangular tombs covered with organic matter such as leaves and Traditional conservation tends to think that "nature must be protected from disturbances", however, the multidisciplinary studies conducted in the Amazon region reveal that disturbances in nature are not only common, but integral to the health of an ecosystem and its biodiversity. 52 The instability, non-equilibrium, and at times chaos created by disturbance encourage environmental heterogeneity through the creation of patches, mosaics, and edges of distinct habitats where diverse species can thrive. 53 The disturbances humans cause (or caused) in the Amazon, have created synanthropic relationships with animals that "do not show regular irruption cycles, but have a propensity for dramatic population increase under favourable anthropogenic conditions associated with agricultural production or storage." 54 In some cases, these species become dispersers of plant seeds that are useful to them and to humans. 55 "Several Amazonian Indigenous peoples credit agoutis for cultivating Brazil nuts" and in the Jamamadi universe, there are no such things as wild plants, everything is cultivated by some "other" cultivator. 56 Terra preta occurs in soil patches whose size varies between one hectare and several hundred hectares. 57 Archaeological research has confirmed that it occupies at least between 0.1% to 0.3% of the area in question, that is, 6,000 to 18,000 km2, 58 and it has been speculated that it could occupy up to 3.2%, that is, 154,063 km 2 using predictive algorithms. 59  could even occupy up to 10% of the forest of the Amazon. 60 Compared to adjacent soils, terra preta contains 2 to 8 times more total nitrogen, and up to ten times more total phosphorus. 61 The terra preta layer extends 40-60 cm deep on average, but in certain cases it can reach up to 2m. lt contains human occupation remains (ceramic fragments, lithic artefacts, bones, and charcoal) through all of its thickness.
Generally, terra preta is located on non-floodable ground or terra firme. These soils are well drained, often near rivers, creeks, or lakes, and almost always in a topographic position that permits a good view of the area as a whole. 62 There is evidence of the presence of terra preta from around 7,000 years ago, but archaeological research indicates that there was a great increase in its development during the middle of the first millennium AD. 63 Terra preta not only contain higher concentrations of nutrients such as nitrogen (N), phosphorus (P), potassium (K) and calcium (Ca), but also greater amounts of stable soil organic matter. 64 The organic matter occurs as freshly added plant, animal, and insect remains, which gradually transform into stabilised nutrient-rich humus material. 65 Frequent findings of charcoal and highly aromatic humic substances suggest that residues of incomplete combustion of organic material (black carbon) are a key factor in the persistence of organic soil matter in these soils. Terra preta contains up to 70 times more black carbon than adjacent soils. 66 Black carbon is chemically and microbially stable due to its polycyclic aromatic structure and persists for centuries. 67 Oxidation during this time produces carboxylic groups 68 on the edges of the aromatic backbone,

Human Functional Circle
In 2009, Guido van Hofwegen et al. conducted a research project for "identifying and quantifying the carbon and nutrient fluxes as well as gaining insight into the processes that make the fertility of these soils so persistent." 76 In their first diagram, 77 dedicated to the human transportation of matter to the villages, the authors divided the main entries into three categories: atmospheric, aquatic, and terrestrial.
Carbon and nitrogen are introduced from the atmosphere, while the aquatic and terrestrial represent flows of carbon, nitrogen, and phosphorus.

Figure 5. Diagram of material inputs and outputs to the village and surrounding fields.
When analysing the behaviour of the people that led to the formation of the terra preta, it is necessary to consider that most of the basic decisions happened at the personal or family level, and therefore, there are enormous complications in relation to the heterogeneity of types, quantities, and distribution of inputs and withdrawals over time. 79 In addition to this, most contemporary residents do not know that the terra preta is anthropogenic, although many recognize the benefits of cultivating in it, they do not understand how it was formed. 80 The lack of local understanding of these processes could be due to the historical disjunction in the patterns of settlement and land use, 81 or because the formation of the terra preta requires several decades. 82 The Kayapó are known to intentionally modify soils to optimise their crops 83 through composting, mulching, burning, and direct application of fertilisers in the form of specially formulated ashes, organic material from offsite and termite and ant mounds, modifying soil characteristics in the short and long term. 84 But it cannot be known with certainty whether or not the 79 Woods and Glaser, "Towards an Understanding of Amazonian Dark Earths," 1-8.  pre-Columbian inhabitants had the intention of generating terra preta. At the level of human perception-action, the engineering of terra preta, happens as an inherent effect of localized resource management as well as due to the search to achieve short-term objectives such as: the elimination of non-useful plants, the protection of useful plants, or the selection of phenotypes 85 useful for humans. 86 Processes that, in addition to contributing to the pedogenesis of the terra preta, also resulted in the domestication of the forest.
The human functional circle enacted in the Amazon modifies the composition of the soil through the management of organic matter that is presented to humans as food, building material, or any other object necessary for survival, meaning that a same object will exist differently according to the species concerned. In the case of humans, "the physical data of the environment exist as four main categories or predicates: resources, constraints, risks and amenities." 87 The anthropogenic management of the In his article Cosmology as Ecological Analysis (1977), Reichel-Dolmatoff mentions that for the Tukanos with whom he worked, the sun's energy forms a circuit that "flows continuously between man and animal, between society and nature". The Tukano individual "is conscious that he forms part of a complex network of interactions which include not only society but the entire universe." 92 The rules the individual has to follow refer, above all, to cooperative behaviour aimed at the conservation of ecological balance as the ultimately desirable quality. Thus, the relationship between man and his environment is being formulated not only on a cognitive level, but clearly it also constitutes an affective personal relationship in which individual animals and plants are treated with respect and caution. 93 Reichel-Dolmatoff continues his text by mentioning the precision with which the Tukans understand seasonal climatic variation, and the behaviours of the other zoological and botanical species that inhabit the same locality. For example, when a human harvests a vegetal species or hunts an animal, the "borrowed" energy must be converted "into an essence that can be reincorporated into the circuit" 94 by its consumption as a nourishment. However, it does not explain how this energy is reintegrated beyond human consumption. Following his analysis, it could well be understood as being reintegrated into the soil as feces, urine and the decomposition of bodies. What is mentioned, however, is the use and significance of other bodily fluids such as semen, menstruation, vomit and saliva, which are inscribed in this circuit of sexual energy that flows through their localized cosmos. In the Tukano worldview the human is not positioned in nature, neither as being dominant of it, nor in harmony with it. Nature "is not a physical entity apart from man and, therefore, he cannot confront it or oppose it or harmonise with it as a separate entity." 95 This is reminiscent of the notion of magical unity hypothesized by Simondon as "the relation of the vital connection between man and the world, defining a universe that is at once subjective and objective prior to any distinction between the object and the subject." 96 For Reichel-Dolmatoff, the emergence of technicity is the result of a "phase shift" away from this way of being in the world, however it seems that in the Amazon region, technicity appeared without a "phase shift" from the ""magical.".
The long-term human presence in Amazonia has had impacts on floristic and faunal diversity in locales and regions, and these impacts are reflected in traditional knowledge. Amazonian traditional knowledge is reflected in lexical richness of vocabulary referencing biota intrinsic to anthropic landscapes. 97 The diversity hosted by the Amazon region "is, or was, contingent on human-mediated disturbance, which is another way of saying human history and agency." 98 Agriculture in the Amazon is a technical activity that presupposes social skills capable of establishing an extensive network of relationships between humans and non-humans, and therefore cultural and technological repertoires, such as politics, art and cosmology represent social skills that were transposed to the landscape. 99 The pre-Columbian inhabitants of the Amazon did not perceive their influence on the ecosystem in terms of genetic modifications, but in terms of phenotypic variations 100 that were inscribed in various languages spoken in the region. Contemporary natives of the Amazon often encounter multiple species in cases where scientific classifications see only one, this phenomenon is known as over-differentiation: Although manioc is recognized as constituting but one species scientifically, it is typically sub- "It is now clear that agrarian technology arose independently in Amazonia" as a form of resource management "within the framework of spatialization in traditional knowledge, which tends to be limited to the immediacy of known and historic landscapes."-104 Anthropogenic disturbance-that is, the modulation and distribution of resources-that gave rise to the terra preta in the Amazon, is one of the various techniques for cultivating the land that existed "prior to the employment of pesticide as a universal solution;" 105 a technodiversity enacted by humans who, unable to conceive themselves as "external to", or as "part of" nature, maintain an inherent bodily proximity with the forest, in a process that is more like a "familiarization with" rather than a "domestication of" non-human species. 106 Amerindians refrain from making their organization of the land into the "primary organizing principle" of the forest. In short, one could say that they do not submit the forest to human generalized domestication. They no doubt made the forest more favorable to human life but did not colonize the forest. 107 Agriculture in the Amazonian region involves the itinerant swidden method, which has resulted in an abundance of forest types in the regrowths that follow after a few years of burning. In some cases, after the initial plantation of a swidden field and its respective burning, a forest is regenerated with a tendency to high diversity, containing a species richness that is divergent from the species present in surrounding areas. 108 "Fallows will eventually result in a biodiverse and high biomass forest. Swidden is not only a cultivation system in the forest, it is as well and very importantly a procedure for high forest regeneration." 109 Harris conducted a long-term cycle study-5 to 10 years-of the swidden polycultural agriculture of the Waika. These crops contained species such as banana (musa paradisiaca), yucca (mani- 208 by economic and military competition has blinded us of seeing the multiplicity of cosmotechnics". 113 It seems to us that the infrastructure of the terra preta offers us a key to overcome problems such as water pollution from the use of agrochemicals and the sewage system, soil degradation from intensive monocultural agroindustry and the damaging effects on the health of humans and other biological species caused by these mono-technological approaches.
At present there are two main currents trying to extrapolate some of the elements of the composition and generation of terra preta to the contemporary world: (a) Terra Preta Nova This name was coined by William Sombrek during his panel at the Latin American Geographers conference in 2001. It is considered that the addition of biochar can be an effective replacement for the application of agrochemicals to fertilize soils. 114 Biochar is a carbon-rich product that is produced by the slow thermochemical pyrolysis of biomass materials. Organic residues such as livestock manure, sewage sludge, crop residues, and compost are converted to biochar, and then applied to soils. 115 As mentioned above, the carbon structure increases nutrient retention and allows for the emergence of a larger fungal and microbial population. The positive effect of the use of charcoal for crop improvement has been documented in science since the beginning of the last century, however the nutrient retention capacity of the recently produced biochar is low, as it increases with the passing of time. 116 At present there are several agents, both commercial and scientific, that-inspired by the phenomenon of terra preta-produce and promote biochar to improve degraded soils without using agrochemicals and increase its capacities for the sequestration of C present in the atmosphere. Sanitation proposes a paradigm shift that "must recognize human excreta and household water not as waste, but as a resource that must be available for reuse." 117 This transforms organic kitchen waste, urine and human feces using lacto-fermentation and vermicomposting in a two-stage process. 118 Lacto-fermentation is an anaerobic biological process that generates a pre-stabilization of the mixture.
Its main advantage is that it does not produce gases or strong odours. The mixture of microorganisms needed for lacto-fermentation is commercially available, but it can be expensive and spoils after a few weeks. Therefore, one of the easiest ways to obtain an effective microbial mixture is by taking an inoculum from Sauerkraut (pickled sour cabbage). 119 Lacto-fermentation causes an inhibition of pathogens such as escherichia coli and salmonella, which allows its application to the production of food without risks to human health. 120 Vermicomposting is a process of aerobic decomposition of pre-digested materials by the combined action of worms and microorganisms. Following these processes, it is possible to "hygienically and sustainably convert biological waste and faecal matter into highly fertile humus-like material." 121 Although the idea of personally manipulating our own excretions instead of letting them go down the toilet may seem like an unpleasant activity for those of us who have grown up coupled to the sociogeny 122 of late modernity, when we leave this frame of subjectivation, even only in theoretical terms, the necessity of closing the cycles of material flows becomes obvious. Taking into account the mesology of the terra preta-we know that we can easily take advantage of the nutrients present in our own waste to produce our food-but it is also important to consider that the regenerative agroforestry infrastructure that intersects in it represents an adaptable and plural prototype, for the constitution of food autonomies that could allow a global and sustainable abundance, activated from localized human agency. The localized ecological disturbance through which the terra preta was engineered as a techno-geographic Wynter, the sociogenic principle is the "organizing principle that encodes information of the criterion of being / not-being of each culture ..."