Internal Design of a Hydroponics Greenhouse for Tri Cycle Farms

Hydroponics is the agricultural technique of growing plants without soil, using other growing media and added nutrients in a solvent. It is an attractive agricultural method over conventional agriculture because it is more water efficient, is less labor intensive, yields higher quality crops in less time, and is easier to control. According to the Digital Journal, “hydroponics crop value is anticipated to grow to USD 27.29 Billion by 2022 at an estimated CAGR of 6.39% from 2015 to 2020” (Sawant, 2016). Alongside this growing market acceptance for hydroponics, there is also a local demand that requires only a small transportation cost. For the past several years, Tri Cycle Farms - a 501-(c)(3) non-profit urban farm in Fayetteville - has dreamt of building a hydroponics greenhouse because it would provide a source of sustainable financial income, a location for educational programming, and a means of battling food insecurity. Since August 2017, I have been working with Tri Cycle Farms to help make the hydroponics greenhouse project a reality. The objectives of this section of the overall project are 1) to determine desirable crops to be produced, 2) design the internal layout of the chosen greenhouse, and 3) design one hydroponics system using engineering design and fluid mechanics. This thesis report outlines the process of fulfilling these objectives, the justification behind the design decisions, and a discussion of the potential implications moving forward

Microbial ecosystem constructed in water for successful organic hydroponics

Conventional hydroponics systems generally use only chemical fertilisers, not organic ones, since there are no microbial ecosystems present in such systems to mineralise organic compounds to inorganic nutrients. Addition of organic compounds to the hydroponic solution generally has phytotoxic effects and causes poor plant growth. We developed a novel hydroponic culture method using organic fertiliser. A microbial ecosystem was constructed in hydroponic solution by regulating the amounts of organic fertiliser and soil, with moderate aeration. The microbial ecosystem mineralised organic nitrogen to nitrate-nitrogen via ammonification and nitrification. A 97.6% efficiency of nitrate-nitrogen generation from the organic nitrogen in the organic fertiliser was achieved. The culture solution containing the microbial ecosystem was usable as a hydroponic solution. Vegetable plants grew well in our organic hydroponics system under continuous addition of organic fertiliser, and the yield and quality approximated those of vegetables grown by conventional hydroponics

RWU’s University College and Acopia Harvest International Launching Educational Programs in Hydroponics

Acopia Harvest International and University College at Roger Williams University are partnering to create education and training programs in the hydroponics industry for students, military personnel, senior citizens, homemakers and career-chasers alike

Selenium Biofortification in Radish Enhances Nutritional Quality via Accumulation of Methyl-Selenocysteine and Promotion of Transcripts and Metabolites Related to Glucosinolates, Phenolics, and Amino Acids

Two selenium (Se) fertilization methods were tested for their effects on levels of anticarcinogenic selenocompounds in radish (Raphanus sativus), as well as other nutraceuticals. First, radish was grown on soil and foliar selenate applied 7d before harvest at 0, 5, 10 and 20 mg Se per plant. Selenium levels were up to 1,200 mg Se/kg DW in leaves and 120 mg Se/kg DW in roots. The thiols cysteine and glutathione were present at 2-3 fold higher levels in roots of Se treated plants, and total glucosinolate levels were 35% higher, due to increases in glucoraphanin. The only seleno-aminoacid detected in Se treated plants was Se-methyl-SeCys (100 mg/kg FW in leaves, 33 mg/kg FW in roots). The levels of phenolic aminoacids increased with selenate treatment, as did root total nitrogen and protein content, while the level of several polyphenols decreased. Second, radish was grown in hydroponics and supplied with 0, 5, 10, 20, or 40 \uf06dM selenate for one week. Selenate treatment led to a 20-30% increase in biomass. Selenium concentration was 242 mg Se/kg DW in leaves and 85 mg Se/kg DW in roots. Cysteine levels decreased with Se in leaves but increased in roots; glutatione levels decreased in both. Total glucosinolate levels in leaves decreased with Se treatment due to repression of genes involved in glucosinolates metabolism. Se-methyl-SeCys concentration ranged from 7-15 mg/kg FW. Aminoacid concentration increased with Se treatment in leaves but decreased in roots. Roots of Se treated plants contained elevated transcript levels of sulfate transporters (Sultr) and ATP sulfurylase, a key enzyme of S/Se assimilation. No effects on polyphenols were observed. In conclusion, Se biofortification of radish roots may be achieved via foliar spray or hydroponic supply. One to ten radishes could fulfill the daily human requirement (70 \uf06dg) after a single foliar spray of 5 mg selenate per plant or one week of 5-10 \uf06dM selenate supply in hydroponics. The radishes metabolized selenate to the anticarcinogenic compound Se-methyl-selenocysteine. Selenate treatment enhanced levels of other nutraceuticals in radish roots, including glucoraphanin. Therefore, Se biofortification can produce plants with superior health benefit

A Growing City: Hydroponic Farming in Buffalo

The City of Buffalo is need of revitalization. Vacant lots, a declining economy, widespread poverty, and a lack of employment opportunities are just a few of the issues that the City needs to address. The City should consider implementing innovative policies, such as investing in and operating a hydroponic urban farm. Hydroponic farming is highly productive and requires a fraction of the resources of traditional farming. Although hydroponic farms are expensive to get started, they are ideal for urban areas because they can operate successfully on as little or as much land as is available. The City could also take advantage of State, Federal and private funding to help mitigate some of the startup costs. A hydroponic farm would be a creative reuse for Buffalo’s many vacant lots and brownfields, as hydroponic farming does not require soil

Future proofing

Drastic improvements in growing technology in the Netherlands have achieved a large reduction in energy use and a striking increase in production

Evaluating Plant Brushing as a Strategy for Height Control in Edible Crop Species

Greenhouse growers producing edible crops can encounter specific challenges when optimizing growing conditions. One challenge is soft growth associated with rapid tissue expansion. Soft growth can lead to plants falling over or soft, floppy leaves. These plants can suffer from increased disease pressure and lower market value. Controlling plant height is one way of reducing soft growth. Outdoors, winds or other external forces can create mechanical stress on plants, triggering a naturally occurring plant hormone called ethylene that reduces plant growth. I conducted an experiment during the summer of 2017 in the MacFarlane Greenhouses at the University of New Hampshire to introduce mechanical stress to hydroponic leafy greens, potted herbs, and seedling vegetables to test whether that stress would lead to reduced growth. I used an automated boom to brush plants with light plastic every hour and compared the growth of the brushed plants with the growth of plants that were not brushed. I found that the effects were species-dependent, with basil, sage, and tomato showing the greatest reductions in plant height. We also found that all brushed species showed a total reduction of shoot growth, and no significant difference in quality as defined by “leaf greenness.

Hydroponics or Soilless Culture

Historically, hydroponics is not a new field; plant physiologists have known and used it for some 100 years. Inevitably, some enthusiasts got carried away.Claims were made of enormous potential yields; skyscraper tops were said to be capable of producing enough food for all of their occupants; and closets, basements, garages, etc. were wishfully converted into fields for hydroponic culture. Numerous publications on the subject appeared during this period. Basic requirements for hydropinc techniques are given along with examples of where soilless culture has been used commercially

Thidiazuron-induced shoot organogenesis from mature leaf explants of scented Pelargonium capitatum cultivars

Shoot organogenesis from mature leaf tissues of two scented Pelargonium capitatum cultivars, ‘Attar of Roses’ and ‘Atomic Snowflake’, grown in the greenhouse, were optimized in the presence of thidiazuron (TDZ). The protocol involved preculture of leaf sections on basal Murashige and Skoog (MS) medium supplemented with 10 lM TDZ, 4.4 lM of 6-benzyladenine (BA) and 5.4 lM a-naphtaleneacetic acid (NAA) for a period of 2 weeks and followed by subculture of explants to a fresh medium containing 4.4 lM BA and 5.4 lM NAA. Frequency of regeneration reached approximately 93% for both cultivars, with the induction of more than 100 shoots per explant. Regenerated plantlets were rooted on half-strength MS medium supplemented with 4.4 mM sucrose and 8.6 lM of Indole-3-acetic acid (IAA). All regenerated shoots from both cultivars developed roots when transferred to organic soil mix, acclimatized, and successfully transferred to greenhouse conditions. When regenerated shoots were transferred to hydroponic conditions, frequency of survival was 76.2 and 61.9% for ‘Attar of Roses’ and ‘Atomic Snowflake’, respectively

Water use efficiency of tomatoes - in greenhouses and hydroponics

Massive amounts of water are required for the production of our food, varying from several cubic metres per kilogram of beef to as low as 4 litres per kilogram for tomatoes grown in high-tech glasshouses. This article presents data on Product Water Use (PWU) of some foods and discusses how the water requirement for fresh tomatoes can be brought down from 300 to 4 litres/kg