The thesis follows up an assessment of germination and growth dynamics of maze, in relation to different processing of soil in the region of Kozojed in North Pilsen. This experiment was conducted in the year 2016. In utter overview of the thesis, we can find a description of the technological procedure of maze cultivation, and individual technological procedures of soil preparation in more detail. In the resultant part of the thesis, we find the evaluation of germination, height, number of plants per m2 (squared meter), and average number of sticks per plant; further evaluation of WTG (Weight of thousand grains) of individual growers' technologies, and the most important overall produce of maze biomass in four variants of soil processing. Examined variants in the thesis are as follows: Sowing into deeply processed soil (underlay), Sowing into stubble, Sowing into loosened soil (disk plow), Sowing into tillage. The results showed that in provided soil-climatic conditions the best came out maze that was sown into stubble. In total biomass yield was option No. 3. sowing in loosened soil, where the resulting income, 30, 21 t.ha-1. From variants No. 1. seed to uderlay it was 0,93 t.ha-1 and No. 2. sowing into stubble to 3,57 t.ha-1 less than option No. 1. The highest difference was in variant No. 4 in the plow, where the biomass yield was by 7.26 t.ha-1 lower than in variant No. 3.

abstract: The lack of food safety in a grower's produce presents the grower with two risks; (1) that an item will need to be recalled from the market, incurring substantial costs and damaging brand equity and (2) that the entire market for the commodity becomes impaired as consumers associate all produce as being risky to eat. Nowhere is this more prevalent than in the leafy green industry, where recalls are relatively frequent and there has been one massive E. coli outbreak that rocked the industry in 2006. The purpose of this thesis is to examine insurance policies that protect growers from these risks. In doing this, a discussion of current recall insurance policies is presented. Further, actuarially fair premiums for catastrophic revenue insurance policies are priced through a contingent claims framework. The results suggest that spinach industry revenue can be insured for $0.02 per carton. Given the current costs of leafy green industry food safety initiatives, growers may be willing to pay for such an insurance policy. / Dissertation/Thesis / M.S. Agribusiness 2013

A tese Na Estrada dos Enigmas, Leituras e Linguagens - Imagem e Palavra em Cena propõe uma reflexão sobre a formação de professores de leitura e produção textual e relata uma prática de ensino que utiliza a arte como mediadora e, para isso, atenta que é preciso que o educador transite pelo universo da arte; assim, pretendemos mostrar como isso foi possível em nossa dimensão pedagógica, a partir de experiências intelectuais, artísticas, pedagógicas, emocionais que nos constituíram enquanto educadora. Retomando as palavras de Jean Lauand, ela serve \"no sentido daquela felicíssima confusão que a língua espanhola faz com a palavra enseñar: ensinar não só como ensinar, mas como mostrar\". Sendo assim, o primeiro capítulo se destinou a delinear, por meio das formas poéticas da vida, recriadas pela arte, uma reflexão acerca da formação do educador na sociedade contemporânea. Nosso intento foi descrever como mediamos um processo pedagógico com vistas à formação do educador contemporâneo, capaz de encontrar os arregalados olhos grandes que há dentro de cada alma formada e vertida pelo céu e pela ciência, e ver a realidade além da imagem e, a partir da sua contemplação, encontrar vias possíveis para a solução de seus próprios enigmas. E isso se justificou pelo fato de que na sociedade contemporânea, verificamos a emergência de nos constituirmos enquanto educadores que exerçam uma função social, que articulem seus saberes, planejem e concretizem o fazer pedagógico de forma realmente profissional, conscientes da responsabilidade perante o aprendiz que nos foi confiado, bem como perante aos outros integrantes do tecido social, e que alcancem com o objetivo de possibilitar a constituição de uma educação estética e, consequentemente, pela educação de seres humanos autônomos e melhores. No segundo capítulo, apresentamos um estudo que fundamenta a concepção de leitura do educador leitor e produtor de textos, apto a mediar a construção do conhecimento de seus alunos, no que concerne à leitura e à produção de textos. Partirmos da constatação de que não é possível extrair do vazio, a leitura e a produção textual. Por esse motivo, entendemos que é papel do educador despertar no aluno a consciência de que a leitura e a reflexão sobre o processo de composição textual desenvolvido por outros autores são elementos primordiais e fundamentais do processo de construção do seu (do aluno) texto, pois, leitura e conhecimento técnico são propulsores da compreensão e da interpretação, bem como contribuem para o fluir da criação. No terceiro capítulo, relatamos algumas práticas de leitura e produção de textos que desenvolvemos com nossos aprendizes, a fim de ilustrar que ensinar a produzir textos, longe da crença comum, não é simplesmente transmitir conhecimentos sobre definição de gêneros, modalidades e estrutura formal de produções discursivas; é sim um ato de extrema complexidade, pois exige que o leitor e, posteriormente, o produtor de textos, primeiramente, se emaranhe no tecido e na estrutura textual alheia para desvendá-los e, depois possa, finalmente, criar o próprio texto. E, além disso, possa também eleger destinos e dá-los a esses textos. E, finalmente concluímos, certos de que para a epifania da escrita ocorra, é preciso que a leitura salte para dentro da vida. / On the Enigma, Reading and Language Road - Images and Words on Stage is a study that proposes a reflection on the education of reading and text production teachers and reports on a teaching practice that uses art as medium, thus, calling attention to the need of educators to pass through the world of art. We intend to show how this is possible within our pedagogical dimension, and through the use of the intellectual, artistic, pedagogical, and emotional experiences we acquired as teachers. In Jean Lauand\'s words, it is used \"in the way that Spanish very delightfully confuses the word enseñar: enseñar means not only teach, but also show\". Therefore, the objective of the first chapter was to outline, through the poetic forms of life, recreated through art, a reflection on the education of the teacher in today\'s contemporary society. Our aim was to describe how we mediated the educational process in the development of today\'s teachers, capable of seeking deep inside their souls for the awareness of looking beyond the image, and through this contemplation, find possible solutions for their own enigmas. This was justified by the fact that in contemporary society we note the urgency of developing educators who actually perform a social function. These are educators who articulate knowledge, plan pedagogical activities and carry them out in a truly professional manner, conscious of their responsibilities to the learner who was entrusted to them, as well as to other participants in the social fabric and whose objectives are to provide an aesthetic education which will consequently result in the education of better and independent human beings. In the second chapter, we present a study based on the educator\'s concept of reading, on his/her capacity of acting as a medium in the building of knowledge in his/her students, in reference to reading and text production. We begin with the verification that it is not possible to extract reading or text production from empty space. For this reason, we understand that the role of the educator is to awaken the student\'s awareness to the fact that reading and reflecting on texts written by other authors are basic and fundamental principals for the student\'s own text production, because, reading and technical skills are the driving force to comprehension and interpretation, as well as contributors to the creative flow. In the third chapter we report some reading and text production practices that we developed along with our learners, to illustrate that teaching to produce texts, far from common belief, is not simply transmitting knowledge and defining genres, modes and formal discursive structures. Text production is an extremely complex activity, because it requires that the reader, who later will become a text producer him/herself, first be enmeshed in the texture and structure of someone else\'s text, to unveil it, so he/she may later create his/her own text, as well as determine the purpose and fate of these texts. We finally conclude that for a writer\'s epiphany to occur, reading must take a leap into life.

Submitted in fulfillment of the academic requirement for a degree in Doctor of Philosophy (Ph.D.) in Food Science and Technology, Durban University of Technology, Durban, South Africa, 2017. / There has been a global increase in fresh produce consumption, due to its attendant nutritional a nd health benefits. On the other hand, increase in the outbreak of diseases, accompanied with health and economic implications, have been traced to this deve lopment. A good number of pathogenic contaminants along the food chain have been identified as causative agent s with Listeria monocytogenes identified as one of such. Among other control strategies, the use of bacteriophage, was recommended as a palliative measure. Furthermore, the a ppli cation of artificial neural networks (ANN) in food safety remains an emerging concept in risk assessment study. Therefore, the aim of this research is to investigate the effect of bacteriophage or phage control and artificial neural network prediction in the inactivation of L. monocytogenes ATCC 7644 on fresh produce. Fresh-cut tomato and carrot were artificially inoculated with L. monocytogenes (108 CFU/ml) and subjected to antimicrobial treatment of Listex P100 bacteriophage (108 PFU/ml), sucrose monolaurate (SML at 100, 250 and 400 ppm), with chlorine (sodium hypochlorite at 200 ppm) used as control. Also, application of ANN to predict the risk effect of antimicrobial treatments of bacteriophage, sucrose monolaurate and chlorine was evaluated on the fresh-cut produce. Mathematical models were developed using a linear regression and sigmoid (hyperbolic and logistic) activation function-(120). Data sets were trained using Back propagation ANN, containing one hidden layer with four hidden neurons. Furthermore, carbon utilization profile of phage-treated L. monocytogenes using phenotypic micro array method was evaluated. In the first phase, susceptibility of L. monocytogenes subjected to certain stress-adapted conditions (acid,-adapted AA, chlorine-adapted CA, heat-adapted HA) and non-adapted-NA to phage treatment inoculated on the fresh-cut produce stored for 10 days at 4, 10 and 25oC was evaluated. The second phase investigated the combination of bacteriophage and sucrose monolaurate (using chlorine at 200 ppm as control) to inhibit the L. monocytogenes growth on the fresh-cut produce stored for 6 days at 4, 10 and 25oC. Physicochemical properties (pH, titratable acid-TTA, total soluble solids-TSS, and colour values-CIE L* a* b*) of the fresh produce after treatment were evaluated. In the third phase, ANN as a predictive tool was used to evaluate the risk involved in the relationship among the initial bacterial load, fresh-produce type, antimicrobial concentration and residual bacteria. In the final phase, 100 µL of phage-treated L. monocytogenes was introduced into a 96-micro well plate impregnated with a tetrazolium dye. The Carbon utilization profile was evaluated at intervals of 4 hours for 48 hours using a biolog micro station. Generally, L. monocytogenes grew on both fresh-cut produce and the storage temperature did not adversely affect the lytic ability of the phage treatment. Antimicrobial treatment of phage and sucrose monolaurate had minimal variations on the physicochemical properties of both fresh-cut samples. All stress-adapted and non-adapted L. monocytogenes were (p ≤ 0.05) susceptible to bacteriophage control. Phage treatment reduced non-adapted, acid adapted, chlorine-adapted, and heat-adapted L. monocytogenes population by 0.57, 0.81, 0.86 and 0.95 log CFU/ml in fresh-cut tomato, and 2.26, 2.41, 2.49 and 2.54 log CFU/ml in fresh cut carrot respectively. Furthermore, the additive effect of SML at 100 and 250 ppm had no significant effect on phage lysis. However, combination of phage with SML at 400 ppm significantly (p ≤ 0.05) resulted in 1 and 3 fold reductions in tomato and carrot respectively. Control treatment with chlorine resulted in 1-2 log reductions on both fresh produce. Algorithm data set trained using ANN gave 100% accuracy. Prediction with logistic activation function showed the highest positive correlation relationship between predicted and observed values with ~ 0.99 R2-value and MSE of 0.0831. Carbon utilization profile showed hexose and pentose sugars-ribose, glucose, fructose and sugars were maximally utilized while oligosaccharide sugars of sucrose, cellobiose and gentiobiose were similarly observed to be utilized. Notably, utilization of glucose-6-phosphate which determines L. monocytogenes pathogenicity was not very pronounced in the carbon profile. Bacteriophage application in the inactivation of L. monocytogenes contamination of fresh produce provides a safe means of control. Its perceived limitation however, can be overcome by combining with other antimicrobials. Similarly, the use of artificial neural networks prediction, remains an improved approach to harness the potential risk that could occur through this method. / D

The Agreement on Agriculture (AoA) was adopted to eliminate the illegitimate use of tradedistorting agricultural subsidies and thereby reduce and avoid the negative effects subsidies have on global agricultural trade. However, the AoA has been fashioned in a way that is enabling developed countries to continue high levels of protectionism through subsidization, whilst many developing countries are facing severe and often damaging competition from imports artificially cheapened through subsidies. The regulation of subsidies in the World Trade Organisation (WTO) has been a highly sensitive issue. This is mainly due to the fear of compromising food security especially by developed countries. Developing countries have suffered negatively from the subsidy programmes of developed countries who continue to subsidize their agricultural sector. This position of the developing countries in the global trade system which has been described as weak, has drawn criticism that the WTO as it currently operates does not protect the interests of the weak developing nations, but rather strengthens the interests of the strong developed nations. The green box provisions which are specifically designed to regulate payments that are considered trade neutral or minimally trade distorting has grossly been manipulated by developed countries at the mercy of the AoA. Developed countries continue to provide trade distorting subsidies under the guise of green box support. This is defeating the aims and objectives of the AoA. The study examines the regulation of WTO agricultural subsidies from the developing countries’ belvedere. It looks at the problems WTO member states face with trade distorting subsidies, but focuses more on the impact these have on developing states. It scrutinizes the AoA’s provisions regulating subsidies with a view to identify any loopholes or shortcomings which undermine the interests and aspirations of developing countries. This is behind the background that some of the provisions of the AoA are lenient towards the needs of developed countries at the expense of developing countries.

Magister Legum - LLM / The objectives of the research was to critically analyse arguments for and against agricultural trade liberalization and its impact on food security, investigating the nexus between the three pillars of agriculture and food security, considering how the Agreement on Agriculture and the Food Aid Convention addressed the concerns that were raised by the different parties during the negotiation period, and finally it considered how the current multilateral negotiations in agriculture can provide a secure framework within which developing African countries can pursue effective policies to ensure their food security. / South Africa

The major objective of this study was to seek a better knowledge and greater understanding of the factors associated with successful pineapple farming in the Eastern Cape Region of the Union of South Africa. As no previous · investigation equally representative of commercial pineapple farming patterns in the Eastern Cape has been made, this study can be regarded as a pilot survey of the labour structures, rates of production, combination of enterprises; marketing channels and the suitability of various districts in the region of study for the production of pineapples. In addition, the history of the pineapple in South Africa will be traced briefly, and the position the Union holds as a supplier of pineapples on the world market, will be investigated. the importance of the Eastern Cape as a producer of pineapples in South Africa is well known, but is also unequivocally illustrated by the information in Table 1. According to estimates made by the Division of Economics and Markets for 1955/56 season, no less than 86.5 percent of the total acreage planted to pineapples in South Africa, was located in this area. Bathurst, East London and Albany, three of the six districts included in the estimate, were particularly prominent. Taken together, they cultivated more than three-quarters of the total area planted to pineapples in the Eastern Cape, and nearly 70 per cent of the total for South Africa. The remaining quarter of the area cultivated in the Eastern Cape was located in the districts of Peddie, Komgha and Alexandria.

Most farming at subsistence level is located in rural areas where the majority of smallholder farmers have low productivity which results in high rate of food insecurity. The areas are characterised by animal traction and poor farming practises, and monoculture is mostly preferred. In light of this, this study analyzed the impact of animal power on agricultural productivity. Smallholder farmers in the lowlands of Mohale’s Hoek district of Lesotho were investigated by means of a case study methodology. The aim of the study was to inform agricultural policy about the level and key determinants of inefficiency in the smallholder farming system so as to contribute to policy designed to raise productivity of smallholder farmers. The sampling frame comprised farmers and extension workers in the lowlands of Mohale’s Hoek district. From this frame, 118 farmers and 4 extension workers were randomly selected from four villages, namely‘Mapotsane, Potsane, Tsoloane and Siloe. The four groups of farmers include; the farmers owning and using cattle for ploughing, farmers owning tractor and cattle and using them for ploughing, farmers owning tractor only and using it for ploughing, and farmers who owned neither cattle nor tractor and normally hire these when ploughing operations are to be done on the farm. The interviews of these farmers and extension workers were conducted by means of semi-structured questionnaire which consisted of both open and close ended questions. The study used the stochastic frontier production model for the production efficiencies and linear regression model for the impact of animal traction on agricultural productivity. Both procedures provided insights into the relative contributions of animal power and traditional systems to poverty alleviation and food security in the project areas. Descriptive statistics were employed for farming systems and challenges facing small scale farmers. Gross Margins analysis was conducted for the animal power and tractor power yield levels for maize crop to compare the two types of power. Some diagnostic tests to detect serial correlation and heteroskedasticity and t-tests were also performed. The significant variables include the area of sorghum ploughed, members of the household that assist with family labour, education, quantity of fertilizer applied, time taken by the farmers in farming, members who are formally employed, household size, area of land ploughed, old age, costs of tractor and animal, marital status, income, area of maize ploughed, area of sorghum ploughed, quantity of fertilizers applied, costs of seeds and fertilizers applied, maize and sorghum yield and amount sold and consumed. The study revealed that monoculture is mainly practised and many smallholder farmers used traditional technologies that fail to replace nutrients in the soil. Nonetheless family labour was not a problem. During the farming season, tractors were used as the main source of power for ploughing. Most farmers hired these for maize production as it is a staple food crop even where animal power is available. It was noted that the tractors were few and in most cases old and malfunctioning. The cost of using animals in farming obviouslyplayed a role in the production of both maize v and sorghum in the lowland areas of Mohale’s Hoek district. Smallholder farmers who owned both tractors and animals produced more but they were mainly affected by high costs of maintaining the aging tractors, generally purchased on the used-equipment market. The increased challenges resulted in lower productivity of the smallholder farmers, including: unhealthy animals, drought, marketing problems, late ploughing, poor soils, lack of extension services, low yields, low income, lack of information, lack of appropriate implements, lack of support services, nutrition inadequacy, inappropriate farming systems. The study recommended the adoption and promotion of low-cost mechanization in the lowlands of Mohale’s Hoek district so as to increase the production of the smallholder farmers. Increased productivity will in turn improve household food security.

In recent years the three Prairie Pools have actively expanded their primary operations to include a number of investments both within and outside of the agricultural sector. The Pools' investment strategies are economically interesting because they are being pursued within the context of a co-operative organizational structure which requires that the users of the cooperative business also own, control, and benefit from its operations. This thesis examines the possible economic incentives agricultural co-operatives may have to invest in vertically integrated and diversified activities using the case of the Western Canadian co-operative elevator companies as an example. The analysis undertaken in this thesis is structured in two ways. First, the economic literature regarding co-operative formation and conventional firm expansion is surveyed. This analysis suggests that an important difference between vertically integrated investments and diversified investments is that they are motivated by the realization of distincly different sets of economic benefits for the co-operative firm and its members. It is argued that co-operative vertical integration can convey benefits to members indirectly through the market, in the form of increased producer margins and improved market access. However, these benefits may not impact the "bottom line" of the co-operative firm. Diversification can, on the other hand, provide a co-operative with direct monetary benefits in the form of improved financial performance and increased profits, which can translate into increased patronage refunds available to members. The second component of this analysis involves the development of a simulation model to examine the implications of an additional hypothesis proposed to explain co-operative expansion. The proposed hypothesis is based on the notion that perhaps the indirect market benefits from cooperation and co-operative expansion are being undervalued. This undervaluation can result in a preoccupation with the monetary benefits from co-operative business, and may therefore cause a bias towards diversified investments. The model developed in this thesis illustrates that, although such a bias may improve a co-operative's rate of return, it may also result in significant opportunity costs for agricultural producers due to a decrease in a co-operative's pro-competitive effect on primary markets. / Land and Food Systems, Faculty of / Graduate

Escherichia coli produtora de toxina Shiga (STEC) está entre os patógenos envolvidos em surtos de doenças transmitidas por alimentos devido ao consumo de vegetais. No entanto, até agora, os relatos sobre a presença de STEC em vegetais no Brasil são escassos. Esse microrganismo é veiculado por alimentos, contaminados direta ou indiretamente por fezes animais, sendo responsável por um amplo espectro de doenças que compreende desde diarréia leve que pode evoluir para colite hemorrágica (CH), até síndrome hemolítico-urêmica (SHU) e púrpura trombocitopênica trombótica (PTT). O presente estudo teve como objetivo investigar a presença de STEC em vegetais orgânicos cultivados na região metropolitana da cidade de São Paulo, Brasil, caracterizando os fatores de virulência stx1, stx2, eae e ehx, bem como o sorotipo. Um total de 200 amostras de vegetais orgânicos (folhas verdes), obtido a partir de três produtores foi analisado quanto à presença de cepas de STEC. Caldo triptona de soja (TSB) suplementado com vancomicina (8 mg / L), cefixima (50 µg / L) e telurito de potássio (2,5 mg / L) foi utilizado na etapa de pré-enriquecimento, com incubação a 37ºC / 24 h, seguido por semeadura em MacConkey Sorbitol (SMAC) e CHROMagar STEC (CHROM). Após incubação a 37ºC / 24 h, as colônias suspeitas foram confirmadas por testes bioquímicos e submetidas a PCR objetivando a detecção dos genes de virulência stx1, stx2, eae, ehx, e os genes fliCH7 e rfbO157. Entre as 200 amostras de vegetais orgânicos analisadas, 30 (15%) foram positivas para E. coli, mas nenhum isolado apresentou os genes de virulência pesquisados. Nossos resultados indicam baixo risco de infecção devido ao consumo destes produtos frescos em São Paulo, Brasil. No entanto, são necessárias mais pesquisas, abrangendo um maior número de amostras e área pesquisada, uma vez que este patógeno já foi encontrado no meio ambiente em estudos anteriores e poucas pesquisas investigaram a presença de STEC em vegetais no Brasil. / Shiga toxin producing Escherichia coli (STEC) strains are among the pathogens involved in foodborne disease outbreaks due to consumption of vegetables. However, reports on the presence of STEC in vegetables in Brazil are lacking. STEC is an important pathogen transmitted by food, directly or indirectly contaminated with animal feces, responsible for a broad spectrum of diseases varying from mild diarrhea to hemorrhagic colitis (HC), syndrome hemolytic uremic (HUS) and thrombotic thrombocytopenic purpura (TTP). This study aimed at investigating the presence of STEC in organic vegetables in the metropolitan region of São Paulo city, Brazil, characterizing the virulence factors stx1, stx2, eae and ehx as well as identifying the serotype. A total of 200 samples of organic vegetables (green leafy), obtained from three organic producers was analyzed for the presence of STEC strains. Tryptic Soy Broth (TSB) supplemented with vancomycin (8mg/L), cefixim (50µg/L) and potassium telurite (2.5mg/L) was used in the pre enrichment step with incubation at 37°C/24 h, followed by plating onto Sorbitol-MacConkey (SMAC) agar and CHROMagar STEC (CHROM). After incubation at 37°C/24 h, presumptive colonies were confirmed by biochemical tests and submitted to PCR targeting the detection of stx1, stx2, eae and ehx virulence genes, as well as fliCH7 and rfbO157. Among the 200 organic vegetable samples analyzed for STEC strains, 30 (15%) were positive for E. coli, but none of them showed the virulence genes studied. These findings indicate low risk of infection due to the consumption of these fresh produce in Sao Paulo, Brazil. However, more research is required, covering a larger number of samples and area, since this pathogen has already been found in the environment in previous studies, and few research investigating the presence of STEC in vegetables has been reported in Brazil.