An examination of determinants of foreign direct investment in Armenia is undertaken to ascertain the potential for attracting foreign investment (FDI) into the horticultural sector of Armenia. The analysis is conducted using survey data collected during face-to-face interviews in August and December 2010. A logit analysis is used to identify the characteristics of firms with substantial current FDI that are operating in Armenia and are planning to undertake additional investment during the next few years. The findings suggest that economic stability and the ability to insure against business risks would encourage FDI. Also, past profitability was dependent on the firm’s satisfaction with the regional market around Armenia.

This investigation was planned to study the new dormant spray, dinitro-ortho-cyclo-hexyl-phenol in relation to its use under Virginia conditions for the control of certain insects with which the Virginia orchardist has constantly to deal. The object of this study is to determine what affects the varying amounts of dinitro-ortho-cyclo-hexyl-phenol, either in oil or water sprays with different emulsifiers, has on penetration, injury and effectiveness. Conclusions which may be drawn from the work discussed in this thesis are: (1) That the 50 per cent goulac and 50 per cent bentonite emulsifier used at the rate of 1.25 pounds per 100 gallons is seemingly the best material among those tested. However, under the conditions in which trials were made this year, a dry form of dinitro-ortho-cyclo-hexyl-phenol mixed with an emulsifier containing bentonite and soy flour appears to be superior in preliminary tests, either in oil or water sprays, due to its better wedding power. (2) That injury which has been examined apparently occurs at the bud and enters the branch through the bud. (3) That the dinitro-ortho-cyclo-hexyl-phenol in oil and water sprays should be applied only in the dormant season, although no serious injury has followed its use in the plots used for this study even when the buds have pushed out leaves as much as one quarter of an inch. (4) That in the plots treated, the powder and water form of dinitro-ortho-cyclo-hexyl-phenol gave satisfactory control of Rosy aphis. (5) That time, care and the following of directions should not be sacrificed in the making up of the emulsions. / Master of Science

Doctor of Philosophy / Department of Agronomy / Steve J. Thien / This phenomenological study explored horticultural students’ intellectual development as defined by William Perry’s Scheme. Perry’s theory of intellectual development helps describe the progression in college student thinking from simple to complex. These patterns of development act as filters through which a student ascribes meaning to their world. The objectives of this study were to: 1) explore the reliability of using the Learning Environment Preference Inventory (LEP) instrument’s Cognitive Complexity Indicator (CCI) scores as a tool to recognize the positions of cognitive complexity of horticultural students, the nature of this complexity and if gender, age, class status, or previous horticultural experience would influence CCI scores; 2) determine if specific teaching methods designed to promote active involvement at a higher level of exchange than lecture might influence scores; 3) describe the effects of the collaborative interactions with classmates and instructor; 4) determine whether student journals would reveal changes in their cognitive complexity or perception of learning as a result of their learning environment and; 5) discover other significant issues that could produce advancement along the Perry scale. Students in this study began their experiences no lower than Perry position two and ranged as high as position four. The initial CCI scores affirmed that many upper-division horticultural students were still operating in Perry positions two and three. Analysis of the interviews revealed: 1) that instructor techniques may positively or negatively influence individual students ideal learning environment; 2) there are significant issues that influence student ideal learning environments; 3) learning is viewed as the responsibility of the instructor, and; 4) students prefer hands-on learning. The students CCI scores did not show upward movement as a direct result of collaborative learning, although the voices of several students expressed both benefits and drawbacks of this type of learning. Journal writing did not reveal any changes in students’ level of thinking or perception of learning but they did reveal other aspects of student learning and attitudes. An understanding of Perry’s Scheme helped the researcher to recognize that student perspective, behavior, and performance is conditioned more by the students’ cognitive complexity than by peer interaction or by teaching methodology.

<p>As the world population continues to grow, it will be challenging to manage resources, reduce environmental pollution and maintain growing demand for food production. Controlled environment agriculture (CEA) is a novel solution to reduce freshwater use in agriculture, minimize environmental pollution from agriculture sector, and meet the growing food demand. CEA allows for the year-round cultivation in inhospitable climatic conditions. Hydroponics is a common method of growing crops in CEA, where plants grow in a solution enriched with nutrients and oxygen. The technique significantly reduces water use and fertilizer run-off during production. In the United States, lettuce is one of the most important crops grown using hydroponics.</p> <p> Hydroponic production uses several methods to grow lettuce including nutrient film technique (NFT) and constant flood table (CFT). Moreover, several cultivars of lettuce are grown in the Midwest. There is a lack of knowledge on whether optimal fertilizer concentrations change depending on the cultivar or hydroponic production system. Little information is known about the suitability of a cultivar to a specific method of hydroponic production. For year-round lettuce production in hydroponics, supplemental lighting (SL) and heating are required in the Midwestern regions of the U.S. The energy requirements for SL and heating can be too costly in winter for some growers to produce crop year-round. In addition to light quantity, spectral composition of light can impact growth. Heating the root zone to produce a micro-climate may be more efficient than heating the entire greenhouse and possibly reduce overall heating costs. However, information on spectral composition of light and the efficacy of root zone heating is unclear, at best. Certain cultivars that can tolerate cold stress can be more suitable in the U.S. Midwest during winter. Lettuce cultivar screening for yield under cooler environments is limited. </p> <p> A completely customizable hydroponic production system that can aid in conducting research related to above-mentioned issues was built as a part of my Master of Science program. Using this system, 24 popular cultivars from four lettuce groups were evaluated for productivity during summer/fall under different concentrations of fertilizer solution, and in two production methods including NFT and CFT during spring. In addition, yield of all 24 cultivars were evaluated under 10, 15.5 and 21.1 °C in a growth chamber. The eight best performing cultivars from the summer/fall trial were evaluated during the winter in a greenhouse with the addition of SL and root zone heating with minimal ambient air heating. </p> <p> Results indicated that the lowest level of electrical conductivity (EC) of the fertilizer solution used (1.3 dS·m^-1) resulted in highest yield, regardless of cultivar or method of production. Among the 24 cultivars; Red Sails (Leaf), Salvius (Romaine), Cedar (Oakleaf), and Adriana (Butterhead) had the highest yields among each group during summer. Growth chamber study indicated that Dragoon, Adriana, New Fire Red and Red Sails cultivars had higher yields than other cultivars under cooler (10 and 15.5 °C) air temperature conditions. In the winter study, lettuce cultivars did not reach harvestable size even after 40 days of growth without SL and root zone heating. Supplemental light composition significantly affected lettuce growth with higher yield under Purple (with higher proportion of red) than White LED lighting. Commercially acceptable lettuce could be produced using root zone heating. In general, plants grown under CFT yielded higher than those grown under NFT in the winter trial. Among the cultivars, Salvius, Black Seeded Simpson, Cedar, and Red Sails performed better under SL and root zone heating during winter.</p>

<p dir="ltr">Pedicels are the slender stalks that attach the fruit to the plant. They play a crucial role in fruit development. The characteristics of the pedicel comprise complex traits that are controlled by multiple genes. To study whether genetic control of fruit mass was via control of pedicel characteristics, we used two unique hybrid apple populations: ‘20 Ounce’ x ‘Prairie Fire’ and ‘Edward VII’ x ‘Prairie Fire’. Both ‘20 Ounce’ and ‘Edward VII’ x ‘Prairie Fire’ produce large fruit over 200 g, whereas ‘Prairie Fire’ is a small-fruited crabapple with fruit size less than 2 g. These populations offer the potential to investigate how pedicel attributes relate to apple fruit size. Previous work established a correlation between pedicel characteristics and apple fruit mass. Specifically, pedicel length showed an inverse relationship, while pedicel diameter was directly related to fruit mass. Shorter and broader pedicels were expected to offer the least resistance to water and nutrient flows. We hypothesize that among the genes that control fruit mass, some govern pedicel length and diameter. Quantitative Trait Loci (QTLs) analysis (Linkage mapping) was performed, and 5 QTLs were associated with characteristics such as fruit mass, pedicel length and pedicel diameter with LOD scores of 4 and above. That being said, no common region was associated with both the fruit mass and pedicel characteristics. This does not support our hypothesis and suggests that different regions may be controlling all these traits. Knowledge of QTLs and subsequently genes that affect fruit mass and pedicel characteristics in apple have potential applications in apple breeding and fruit production. The identification and manipulation of these genes holds the promise of developing new apple cultivars with improved pedicel traits and ultimately fruit mass and enhanced fruit quality.</p>

<p dir="ltr">Water scarcity and acute drought continue to be serious concerns, even in humid climates where precipitation normally exceeds evapotranspiration (ET), highlighting the need for improved landscape water conservation practices. Lawns represent the largest area in most managed landscapes and require regular mowing, feeding and sometimes supplemental summer irrigation to persist. A general historical guideline for lawn irrigation is to supply 25-38 mm per growing wk-1 in the absence of rainfall. This fixed volume is often applied on a programmatic “set and forget” three times per week schedule (e.g. M-W-F). This application guideline often results in excess irrigation as it does not take into account plant need or prevailing environmental conditions. Further, in times of acute summer drought policymakers may restrict irrigation to once or twice weekly to conserve water. The effects of these regulations on turf health and potential water savings are unclear. Thus, two multi-year summer field studies were conducted to identify opportunities for improved lawn water conservation. Study one evaluated the effect of varying weekly irrigation volume and frequency on mature Kentucky bluegrass (Poa pratensis L.:KBG) located under a fixed-roof rainout structure. Turfgrass response was measured as visual turf quality (TQ), digital green color (DGC), volumetric soil water content (VWC) and area under the curve for each response variable. In year one, KBG was subject to six irrigation programs and compared to a high deficit control for 49 days. The programs were: 25 mm total water wk-1 applied either three times (M-W-F) or twice (M and F) weekly, 19 mm total wk-1 twice weekly (M and F), 13 mm total wk-1 once weekly and 60 or 80% accumulated ETo three times weekly. Due to poor performance, the high deficit control and 60% ETo were excluded from further evaluation. In year two, seven programs were evaluated: 33 mm total water wk-1 applied once, twice, or three times weekly, or every-other-day, 25 mm total wk-1 applied twice or three times weekly and 80% ETo twice weekly for 63 days. In both years, generally, 25-33 mm wk-1 applied two or three times wk-1 produced the most consistent TQ, DGC and highest VWC. Study two compared three supplemental irrigation programs to a natural rainfall control for six widely planted cool-season lawn grasses for 70 days. The six lawn grasses were: a KBG sod, seeded drought tolerant and susceptible KBG cultivars, a turf-type tall fescue (Schedonorus arundinaceus (Schreb.) Durmort.: TTTF) blend and two KBG and perennial ryegrass (Lolium perenne L.:PRG) mixtures. In Study two, highly significant differences p < .001 occurred for irrigation program and lawn grasses. While supplemental irrigation aided all grasses, rainfall in year one and two measured 119 mm and 343 mm, respectively, affecting data in each study year. Area under the turfgrass quality curve (AUTQC) was lowest for the rainfall control (339 and 425) and highest for 33 mm wk-1 applied three times (507 and 526) and 80% ETo programs (508 and 535) in year one and two, respectively. Annual responses for DGC and VWC generally followed TQ trends. For grasses subject only to natural rainfall, TTTF, and the KBGs were generally superior to the KBG:PRG mixtures, thus emphasizing the importance of species selection. In summary, these studies compared a traditional “set and forget” irrigation program to a range of alternative programs and different lawn grasses. These data provide evidence for irrigation savings by employing a combination of planting drought tolerant lawn species and adopting a more limited irrigation program. Future field studies should include the evaluation of adaptive, data-driven programs based on forecast environmental conditions and threshold responses like DGC or predetermined VWC set points calibrated for varying soil types and growing environments.</p>

Call number: LD2668 .T4 1984 P74 / Master of Science

The benefits of low UV dose treatment of horticultural produce – also known as hormetic treatment - have been attested to in numerous studies conducted over the last 15 years. However, commercial growers have not adopted the concept of hormesis. With increasingly stringent controls on the use of fungicides and other chemical agents the time has come to examine how hormetic treatment might be applied in the horticulture sector. The objectives of this work were firstly, to confirm UV-induced hormetic effects applied postharvest for a number of different types of produce, namely, tomatoes, broccoli, strawberries and mangoes. Secondly, to evaluate the use of rollers to ensure full surface treatment of produce, and thirdly to evaluate the possibility of treating produce preharvest. In order to investigate surface UV dose distributions, a polystyrene sphere (Diameter 70 mm) was used to simulate fruits such as tomatoes, apples, peaches etc., that have an approximately spherical form. Biodosimetry based on spores of Bacillus subtilis was employed to experimentally determine UV doses and to compare the results obtained with theoretical predictions. Good agreement was obtained and the modelling approach was extended to other types of produce. This showed the amenability of mechanical rollers to ensure full surface treatment of produce. Postharvest treatment of produce was carried using conventional low intensity UV sources principally emitting at 254 nm and also a commercially available high energy pulsed UV source. Treatment using the conventional UV source was carried out on mechanical rollers within a UV cabinet designed for this work at a fixed distance from the source and at an intensity of 1000 μW/cm2. A 5 minute conventional UV treatment of tomatoes was approximately comparable to fruit given a 3-pulsed treatment using the pulsed source (507 J/pulse of polychromatic light). The colour and texture of both groups of fruit were significantly maintained as compared with controls. The treated tomatoes also showed a significant increase in the ascorbic acid levels during storage. Similarly, a 15 minute conventional UV treatment of broccoli heads was comparable to heads given a 10-pulsed treatment using the pulsed source. Where both treatments gave rise to a statistically significant retention of green colour of treated broccoli. In addition, mangoes given a 10 minute conventional UV treatment were comparable to fruit given a 20-pulsed treatment using the pulsed source with both treatments leading to maintenance of texture as compared to control fruit. This confirmed the UV-hormetic effects. The effects of conventional and pulsed treatments are compared and discussed. Preharvest treatment of tomatoes and strawberries was carried out in commercial glasshouses. Doses of either 3 or 8 kJ/m2 were delivered to the fruits using a treatment device designed for the work, which delivered a combined intensity of 2000 μW/cm2 from two low pressure UV sources. The treated tomatoes showed a delay in development of colour as measured on the vine and after picking. Picked tomatoes were inoculated with P. digitatum and C. gloeosporioides and the results obtained showed a significant inhibition of the development of the fungi in the treated fruit during the storage period. These results suggest that the beneficial response shown by the preharvest treatment is not a localised one but a systematically induced resistance observable throughout the treated plant. This was shown by monitoring tomato fruits on treated plants which themselves where not directly exposed to the UV light. The two doses elicited different responses in the treated strawberries, with the 8 kJ/m2 dose causing the fruit to redden significantly faster than the 3 kJ/m2 treated fruits and controls. This could have significant nutritional benefit as the red colour of strawberries has been correlated with anthocyanin levels. On the other hand, treatment at the lower UV dose led to a lag in colour development. The amenability of the equipment utilised for commercial application is discussed.

Magister Artium - MA / Hunger is more than just a feeling, it is the lack of access to safe nutritious food, which in turn may result in anger towards government, low performance, sadness and a limited will to survive. Urban agriculture has been identified as a source of livelihood for many urban residents and could fundamentally change food insecure cities like Cape Town. The Philippi Horticultural Area (PHA) is one such place with an enormous amount of potential to assist the City of Cape Town (CCT) to overcome food insecurity challenges. The PHA is the focus of this thesis that aims to determine the impacts that housing and industrial developments in the PHA have had, and might have in the future, on food security in the Greater Cape Town Area (GCTA). The specific objectives of the study are as follows: (1) To investigate the urban agricultural distribution of the PHA; (2) to investigate agricultural facilitation, people empowerment and the use of land for agricultural purposes; (3) To determine the level of access to food for people within and around the PHA; and (4) To examine the links between the urban agricultural food sector and food production. Mixed method research was employed, hinging on the Sustainable Livelihoods Approach (SLA) as the conceptual framework. Snowball sampling was used to select 68 participants who were interviewed. One key finding of the study showed that the PHA had a significant value to the participants, many of whom called the place ‘home’. Another finding is that urban agriculture provides fresh food produce to many local residents. In-depth discussions with officials and farmers, both commercial and small-scale farmers in the PHA, revealed that the PHA is a valuable portion of farmland, and contributes significantly towards food security in and around the PHA. With the use of the SLA as the conceptual framework, the study contributes towards other livelihood outcomes dependant on urban agriculture to improve access, availability and stability of food security within the PHA. Although urban agriculture is a minimal contributor to food security in the PHA, there are other benefits enjoyed by low-income communities such as food aid given by farmers to assist low-income housing communities, educational opportunities to enhance small growers in the PHA, small-scale community garden outreach and employment.

<p>Hälsans Trädgård is a project which is going to start in Gamla Linköping, Sweden. The authors were commissioned by Arbetslivsresurs, a company working with work rehabilitation, to select, define and make job analyses on five work tasks at Hälsans Trädgård in Gamla Linköping. A job analysis means an analysis of the demands the job make of the individual. The job analysis used in this study is called The Revised Handbook for Analyzing Jobs (RHAJ) and is from the US Department of Labor (DOL). As RHAJ is an American instrument, the authors produced a form where the concepts are translated into Swedish to make the analysis easier. The areas that were analyzed according to the RHAJ were: worker functions, general educational development, specific vocational preparation, aptitudes, temperaments, and physical demands and environmental conditions. The five work tasks that were analyzed at Hälsans Trädgård were: “Raking”, “Planting flowers”, “Weeding”, “Shoveling snow” and “Portraying Lisa”. The result shows that the five work tasks make low demands on the individual and that none of the tasks demand mathematical development. The task “Portraying Lisa” was the task which, in most cases, made the most demands on the individual. The discussion proposes how the work tasks can be more complex. The authors suggest investigations that test the RHAJ for validity and reliability and that the RHAJ in full be translated into Swedish and tested under Swedish circumstances in future research.</p>