Limited knowledge about the 3000-year period between the Neolithic and the Bronze Age in central Anatolia, Turkey, prevents any understanding of change or continuity in crop production, consumption and crop husbandry techniques. This research aims to address this bias through the examination of archaeobotanical remains from the four central Anatolian Chalcolithic sites of Çatalhöyük West, Çamlıbel Tarlası, Canhasan I and Kuruçay and the consequent investigation of their crop economies. This work draws on multiple methods and techniques to understand the plant-related activities that occurred at the sites. The four chosen sites bookend the Chalcolithic period (c. 6000-3000 cal BC) and provide the opportunity for exploring the interrelationship between crop choice, crop husbandry, settlement size, surrounding environment and social organisation. Differences in crop species such as hulled barley, glume wheats and pulses, particularly lentil and bitter vetch occur at all four sites with species choice community specific. Multiple methods are used to disentangle the depositional processes, such as dung burning, that formed the assemblages, providing an indication of the origin of the archaeobotanical material and allowing inferences about the nature of weed seeds found. Crop processing activities are evident at all sites, with the dehusking of glume wheat contributing significantly to the archaeobotanical assemblage. The analysis of stable carbon and nitrogen isotopes of crops coupled with the functional ecology of arable weeds, indicate that crop husbandry techniques/regimes were site specific and were influenced by site size/population as well as environmental conditions. The identification of the crops grown and the methods used to cultivate and process them have implications for understanding the social context of such activities, and the broader socio-economic background of a period preceding the great changes in social structure seen in the Bronze Age.

Thesis (M. Sc. (Plant Protection)) -- University of Limpopo, 2021 / Worldwide, root-knot (Meloidogyne species) nematodes are considered to be the most important and damaging genus in crop husbandry. The existence of a wide host range, over 2000 plants, and several biological races, makes the management of this nematode genus difficult with nematode-resistant crop Hybrid Sorghum Sudan grass (Sorghum bicolor × Sorghum Sundanese) has been classified as being resistant to certain Meloidogyne species and races, with a wide range of uses in crop rotation intended to manage nematode population densities. However, due to the ability of nematodes to enter chemiobiosis when gradually exposed to chemicals, this hybrid might not be effective in managing nematode population densities for the subsequent highly susceptible sweet potato (Ipomoea batatas L.) cultivars. The objective of the study was to determine whether hybrid Sorghum-Sudan grass would suppress M. javanica (Trial 1), M. incognita race 2 (Trial 2) and M. incognita race 4 (Trial 3) population densities, allowing a nematode susceptible sweet potato cv. ′Beauregard′ as successor crop to be cultivated without suffering nematode damage. The hybrid Sorghum-Sudan grass study was conducted under greenhouse conditions, with seven inoculation levels, namely, 0; 5; 25; 125; 625; 3 125 and 15 625 eggs and second-stage juveniles (J2) of each nematode species or race, arranged in randomised complete block design, with six replications and validated in time. Plant growth, foliar nutrient elements and nematodes were collected at 56 days after inoculation and prepared for analysis using standard methods. The reproductive factor (RF) at all levels was zero, whereas nematode inoculation at all levels did not have any effect on plant growth of the hybrid Sorghum-Sudan grass. However, the nematode levels affected the accumulation of nutrient elements and the quality of forage. After cultivating the susceptible sweet potato cultivar in pots xxx previously with hybrid Sorghum-Sudan grass at increasing levels of M. javanica alone, that is in Trial 1, similar results were observed with respect to RF and lack of nematode damage to plant growth. Consequently, the hybrid was suitable for use in crop rotation with sweet potato for the purpose of managing nematode population densities of thermophilic Meloidogyne species and/or races. / National Research Foundation of South Africa (NRF) and the Agricultural Research Council (ARC)