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Eco-Friendly Smart Farms Based On Nutrient Solution Recirculation
UV sterilization and microbial stability analysis used to recycle nutrient solution; proposed method minimizes the use of fertilizers and water by hydroponic farms
15-JUN-2021
UV sterilization and microbial stability analysis used to recycle nutrient solution; proposed method minimizes the use of fertilizers and water by hydroponic farms
NATIONAL RESEARCH COUNCIL OF SCIENCE & TECHNOLOGY
The development of new urban agriculture technologies, such as vertical and smart farms, has accelerated rapidly in recent years. These technologies are based on hydroponic cultivation in which plants are grown using nutrient-rich solutions rather than soil. Approximately 20-30% of the nutrient solutions used during hydroponic cultivation are discharged without being absorbed by the crops, and because most farmers in South Korea do not treat the discharged solutions, hydroponic farms contribute significantly to environmental pollution.
This problem can be reduced if hydroponic farms use a recirculating hydroponic cultivation method that reuses the nutrient solutions after sterilizing them with ultraviolet (UV) light, instead of discharging them. However, two main issues complicate the implantation of such recirculation systems. First, the potential for diseases and nutrient imbalances to develop owing to microbial growth in the recycled nutrient solutions must be eliminated. Second, the initial investment required to set up a recirculating hydroponic cultivation system is often prohibitive, costing hundreds of millions of Korean won per hectare.
However, a new study conducted by researchers at the Korea Institute of Science and Technology (KIST) proposes a method that can stably manage the microbial population in recirculating hydroponic cultivation systems. The research team, led by Drs. Ju Young Lee and Tae In Ahn of the Smart Farm Research Center, KIST Gangneung Institute of Natural Products, conducted an integrated analysis of the microbial growth characteristics by constructing a model that simulates the flow of water and nutrients, and the inflow, growth, and discharge of microorganisms in recirculating and non-circulating hydroponic cultivation systems. Their simulations revealed that the microbial population in recirculating hydroponic cultivation systems can be controlled by adjusting the UV output and the water supply. On the contrary, in non-circulating hydroponic cultivation, the microbial population fluctuates considerably depending on the amount of water used, increasing sharply if there is too little water.
KIST researchers are experimenting with a circulating hydroponic cultivation system. Credit: Korea Institute of Science and Technology (KIST)
High cost has restricted the use of UV sterilization systems in hydroponic farming in Korea And prompted the research team to develop their own UV sterilization system, with further studies underway to commercialize this system as an economical alternative to imported systems.
The results of the study have already received strong interest: the rights to the operation and management software technology for recirculating hydroponic cultivation has been acquired by Dooinbiotech Co., Ltd. for an advance fee of 80 million won (8.5% of the operating revenue), while an agreement is in place with Shinhan A-Tec Co., Ltd. for the advanced recirculating hydroponic cultivation technology for an advance fee of 200 million won (1.5% of the operating revenue). Commercializing the recirculating hydroponic cultivation system is expected to reduce fertilizer costs by approximately 30~40%, which equates to 30 million won per year based on a 1-hectare farm.
Commenting on the envisaged impacts of the study, Dr. Ju Young Lee said, "The developed system makes the transition to eco-friendly recirculating hydroponic cultivation systems an affordable option for many more farmers." Dr. Tae In Ahn added, "We are also developing software and operation manuals to guide farmers in managing the nutrient balance in the solutions to increase the number of farms using the recirculating hydroponic cultivation system."
Lead photo: THE INTEGRATED MODEL DESCRIPTION. view more
CREDIT: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY(KIST)
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The study was supported by the Ministry of Agriculture, Food, and Rural Affairs (Institute of Planning and Evaluation for Technology in Food, Agriculture, and Forestry) and the Innovative Smart Farm Technology Development Program of Multi-agency Package. The research results are published in the latest issue of the Journal of Cleaner Production (IF: 7.24, ranked in the top 6.9% by JCR), a highly respected international journal in the field of environmental science.
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Flushing Hydroponic Systems: Nutrient Imbalance, Waste, And An Alternative Solution
We recommend that hydroponic growers flush their systems every month to every few months, depending on the type of system they’re running. But why? We’re also fans of the recirculating system because it conserves water and nutrients
We recommend that hydroponic growers flush their systems every month to every few months, depending on the type of system they’re running. But why? We’re also fans of the recirculating system because it conserves water and nutrients.
Article from | ZipGrow
04/06/21
Is flushing hydroponic systems wasteful?
We recommend that hydroponic growers flush their systems every month to every few months, depending on the type of system they’re running. But why? We’re also fans of recirculating system because it conserves water and nutrients, so it seems counterintuitive to dump gallons of nutrient solution every few months.
Let’s talk about why this is necessary and how you can practice conservation.
The problem: nutrient imbalance
The main reason for flushing a hydroponic system is a nutrient imbalance. Hydroponic fertilizers are specifically formulated for specific crops (you can buy nutrients for a type of crop, like greens or flowers), but each farmer grows a different combination of crops in different conditions, and the ratios in which plants take up nutrients is usually just a little bit off.
This nutrient imbalance is also affected by metal components if the system has any. Zinc and aluminum ions can cause toxicities if they accumulate over time. While it’s easy to just use plastic tanks and fittings or to coat the metal components in your system with epoxy to reduce leaching, sometimes the presence of metal is unavoidable.
Another reason that growers flush their system is a hygiene practice. Algae and many plant pathogens can survive in the water, and regular cleaning with a mild bleach or peroxide solution or another oxidizing agent is a preventative measure.
Two solutions: flushing and mass balancing
Most hydroponic growers take care of this nutrient balance problem by flushing the system and starting from scratch with nutrients. This is certainly the easiest method. Be sure to check with your local town or municipality to follow the correct disposal procedure.
This practice can have a downside, however, because often the solution dumped from a system when it is being flushed isn’t used elsewhere. This can be wasteful.
The alternative to flushing a hydroponic system is to learn to mass balance. To do this, growers would get their water tested for individual nutrient levels. This usually has to be done through a lab.
Then the grower would adjust each individual nutrient to its proper level.
The reason that many growers choose to flush over mass balancing is that lab tests can be pricey (you’ll probably have to pay at least $50, and sometimes up to $500). Still, this option can be cost-effective, depending on the size of the system and access to lab testing.
Ultimately, how you choose to deal with a nutrient balance is up to you.
The content & opinions in this article are the author’s and do not necessarily represent the views of AgriTechTomorrow
Indoor & Vertical Farming, Monitoring & Growing Fertilizer, Hydroponics
The Role of Silicon As a Nutrient In Hydroponic Recipes
Research has demonstrated that silicon is one of the most beneficial micro-elements for several plants. However, its role has not been considered as essential in plant nutrition
By Karla Garcia
Silicon (also known as silica, Si) is found in high quantities in open field production but is absent in hydroponic nutritional recipes. The lack of knowledge about the role of silicon (Si) in horticultural crops became apparent when using soilless/hydroponic systems.
Research has demonstrated that silicon is one of the most beneficial micro-elements for several plants. However, its role has not been considered as essential in plant nutrition. For this reason Si is not used as a common ingredient in hydroponic recipes. It is the aim of the present article to share the knowledge generated around the role of Si in plant nutrition in order to discuss its possible important function in nutrient recipes.
Despite not being a common ingredient in hydroponic recipes, several beneficial effects of silica have been demonstrated in hydroponic systems (Guntzer et al. 2012; Miyake and Takahashi 1983; Voogt and Sonneveld 2001). The use of Si as a nutrient in plants has shown a positive effect in mitigating environmental and pathogenic stresses. Some authors mention its function as an alternative way to control diseases. However, most of the results support its role as a good complement for disease treatment and prevention.
Van Bockhaven et al. 2013, demonstrated the induction of a broad-spectrum plant disease resistance by implementing Si as part of the fertilizer in plants. Other studies also showed (Hammerschmidt, 2005) Si as an ingredient with the potential to reduce rates and number of fungicide applications, specifically in control of powdery mildew. This same result has been supported by other studies done by Miyake and Takahashi, 1983 and Vercelli et al., 2017.
Silicon is deposited in plant cell walls helping to avoid pest incidence and damage by fungi. Also, the presence of silicon in cell walls can help to improve resistance to heat and drought contributing in the development of strong and healthy plants. This being the reason why many authors present data supporting its role as a nutrient with the potential to increase yields.
One particular issue in the use of Si in hydroponic recipes is pH. Si has a high pH that can affect some nutrient recipes. Also is difficult to maintain soluble in concentrated nutrient solutions. However, as we know, pH can be controlled. Si can be added as a separate ingredient in a different tank and recommendations indicate to reduce pH in the tank containing Si and water directly.
How much silicon should I use?
Now that we know the positive effects of Si in plants. How can we know which form or quantity of Si can be used in hydroponic systems? The requirements of Si by plants in order to get the beneficial effect of this nutrient can be crop-specific. Si can be added in nutrient recipes as silicon dioxide and common ranges used are from 50 to 150 ppm. Being 100 ppm is the most common level. It is important to always start with recommended low levels of Si because too much of this nutrient can affect the uptake of other elements.
It is important to mention that the use of Si complies with current sustainable agriculture EU regulations and is not toxic for humans. Plants can live without silicon, therefore it is not an essential nutrient. However, the more this nutrient is studied the more we know about its role in improving plant health and growth.
5 Microgreen Types Packed With Nutrients You Should Be Eating
Microgreens are known for their nutrient-packed health benefits. But which microgreen types are the most nutritious and healthy to add to our diets? We are going to cover the top nutritious microgreen types and why you should add them to your eating habits now.
Microgreens are known for their nutrient-packed health benefits. But which microgreen types are the most nutritious and healthy to add to our diets? We are going to cover the top nutritious microgreen types and why you should add them to your eating habits now.
Arugula
In microgreen form, arugula has a nutty, peppery, wasabi-like taste. Arugula is one of the microgreen types that is nutrient-dense. It contains high amounts of vitamin C, copper, and iron, which help prevent illnesses like anemia. The phytochemicals also produce glutathione, which is an antioxidant. The combination of these health benefits help prevent and fight off toxins in the body.
Basil
The basil microgreen is a healthy addition to any salad since it has a crisp, citrus-like taste. This microgreen type has polyphenols that reduce oxidation and inflammation to promote gut health. It is high in vitamins such as A, B6, C, E, and it contains calcium, phosphorus, iron, zinc, copper, magnesium, and potassium. Basil is one of the microgreen types that are rich and nutrient-dense and can be a beneficial additive to your diet.
Pea Shoots
Pea shoots are one of the microgreen types that can be eaten raw or cooked. Add them to your salad or cook them in a stir fry to add nutrient-packed vegetables to your food. These microgreens have a plethora of vitamins such as vitamin A and C and folic acid.
Radish
Radish microgreens are known for their spicy flavor profile. You can top off your dishes with the raw radish sprouts to add some heat to any dish. These microgreens are rich in vitamins such as vitamins A, B, C, E, and K. They also contain high amounts of calcium, iron, magnesium, phosphorus, potassium, and zinc. Radish sprouts contain amino acids and chlorophyll, which helps fight illnesses such as cancer.
Broccoli
Broccoli microgreens is another one of the microgreen types that are delicious and nutrient-packed. These popular microgreens contain a high amount of vitamin C, which helps our immune system fight off sickness. They also contain antioxidants and cancer-fighting compounds.
Want to learn more?
Do you want to learn how to grow microgreens from the comfort of your home? We at the Nick Greens Grow Team use our in-depth knowledge to teach our subscribers how to grow microgreens at home!
Sign up for our microgreens class that takes place every Friday at 4:30 pm CST, and become a member of our FaceBook group to connect with others who are learning just like you. If you don’t want to take a class, subscribe to our blog and Youtube channel for weekly updates about growing microgreens and other farming related news!
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September Indoor Science Cafe Recording Is Now Available! "Hydroponic Nutrient Management Basics"
This presentation 'Hydroponic Nutrient Management Basics' was given by Dan Gillespie (JR Peters Inc.) during our 22nd cafe forum on September 22nd, 2020. Indoor Ag Science Cafe is organized by the OptimIA project team funded by the USDA SCRI grant program
This presentation 'Hydroponic Nutrient Management Basics' was given by Dan Gillespie (JR Peters Inc.) during our 22nd cafe forum on September 22nd, 2020. Indoor Ag Science Cafe is organized by the OptimIA project team funded by the USDA SCRI grant program.
All The Elements Microgreens Requires
All The Elements Microgreens Requires
May 4, 2018
None of these elements are in reality more important than the others. Nutrient elements are like everything else in nature's design; they all work together. Try and avoid the whole perception that there is some kind of "magic trick" within special nutrients only, because they are all important. Another important aspect of indoor growing is never forgetting about the living soil microbes. They require all these same elements themselves, especially oxygen, nitrogen, and calcium.
Carbon and oxygen are absorbed from the air, while other nutrients including water are obtained from soil. Microgreens must obtain the following mineral nutrients from the growing media:
Primary Macronutrients: nitrogen (N), phosphorus (P), potassium (K)
Secondary Macronutrients: calcium (Ca), sulfur (S), magnesium (Mg)
The Macronutrients: Silicon (Si)
Micronutrients: boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni), selenium (Se), and sodium (Na)
Carbon
Carbon forms the backbone of many microgreens bio-molecules, including starches and cellulose. Carbon is fixed through photosynthesis from the carbon dioxide in the air and is a part of the carbohydrates that store energy in the microgreens.
Hydrogen
Hydrogen also is necessary for building sugars and building the microgreens. It is obtained almost entirely from water. Hydrogen ions are imperative for a proton gradient to help drive the electron transport chain in photosynthesis and for respiration.
Oxygen
Oxygen is necessary for cellular respiration. Cellular respiration is the process of generating energy-rich adenosine triphosphate (ATP) via the consumption of sugars made in photosynthesis. Microgreens produce oxygen gas during photosynthesis to produce glucose, but then require oxygen to break down this glucose.
According to the Department of Biological Sciences, Idaho State University
Data Analysis
Elemental analysis data and microbial counts for microgreens from the three growing treatments (HFG, HW, and C) were examined by the Shapiro Test for normality and the Fligner–Kileen Test for homoscedasticity using R software [version 3.2.2, R (25)]. Based on the results of these tests, a non-parametric Welch’s ANOVA (α = 0.05) followed by a Bonferroni Correction for multiple comparisons was utilized to determine if there were significant differences among the means for each of the three growing treatments with respect to microbial counts, protein concentrations, and elemental concentrations. The elemental concentration of microgreens was compared with that of mature, raw broccoli (vegetable) produced on industrial farms based on nutrient data in the USDA SR21 database.
Results
The harvested fresh mass in grams (gfw) differed significantly among the three growing treatments (F2.000, 6.447 = 17.8056, P-value = 0.002368). The average (n = 5) fresh mass of microgreens harvested from the HFG treatment (24.64 ± 0.32 gfw) was statistically greater than the average fresh mass harvested from the C treatment (20.00 ± 0.73 gfw, P-value = 0.0066) or the HW treatment (21.01 ± 1.23 gfw; P-value = 0.0310). The dry mass fraction for the three growing treatments ranged from 7.2 to 9.3%, falling within the same range noted for 25 different microgreens studied by Xiao et al. (18). The average dry masses (gdw) harvested from experimental replicates (n = 5) did not differ significantly among treatments (F2.000, 5.671 = 2.5156, P-value = 0.1652) and ranged from 1.53 to 1.96 gdw. The average water fraction (n = 5) for each of the growing treatments was as follows: C (0.913 ± 0.002), HFG (92.5 ± 0.1), and HW (91.0 ± 0.2).
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