Farm & Ranch
Fishy vegetable production methods explained through aquaponics
COLLEGE STATION — If growing vegetables in a box with no soil and out of direct sunlight sounds a little fishy, well, it is.
“Aquaponics” is a relatively new way of intensified farming that combines aquaculture and hydroponics, according to Dr. Joe Masabni of College Station, Texas A&M AgriLife Extension Service vegetable specialist.
“We are combining fish, which is the aquaculture, and hydroponics, which is vegetable production in soilless media,” Masabni said. “Whether it’s running water through pipes or a flood-and-drain system, the idea is to combine the two where the fish waste becomes food for the plants, and the plant roots clean the water by absorbing all the nutrients. The water then is recycled back to the fish.”
Dr. Joe Masabni, Texas A&M AgriLife Extension Service vegetable specialist in College Station, demonstrates a small-scale aquaponics setup. (Texas A&M AgriLife Extension Service photo by Kathleen Phillips)
Dr. Joe Masabni, Texas A&M AgriLife Extension Service vegetable specialist in College Station, demonstrates a small-scale aquaponics setup. (Texas A&M AgriLife Extension Service photo by Kathleen Phillips)
Aquaponics methods originated at the University of the Virgin Islands in the early 1980s by Dr. James Rakocy, who retired from the university in 2010. He is still active in the industry with the book, “Aquaponics: a Comprehensive Guide to Proven Principles and Practices,” which he co-authored with his successor Dr. Wilson Lennard.
The method has been tried and even successfully used by producers in Texas since the late 1990s. But in the past five or so years, Masabni said, interest has steadily increased in Texas among vegetable producers to the point that a majority of the requests for assistance he receives pertain to hydroponics and aquaponics.
“It has become very popular, because in general with hydroponics you can produce the same crop with a lot less water because the water is recirculating. And with the addition of the fish population there is less fluctuation in the nutrients,” he said. “You don’t have to replenish the minerals, and you don’t have to worry about pH results going really high or really low.
“In theory, you can grow any vegetable because what you have is water, oxygen and nutrients,” he said. “The roots of the plants are sitting in a nutrient-rich situation with lots of water and lots of oxygen, so they will never rot. Anything can grow.”
He said the most cost-effective plants to grow might be herbs, lettuce, kale, watercress, spinach and other small plants that have a relatively fast yield. Other vegetables, such as tomatoes, also can be grown aquaponically, but may not produce quickly enough to be profitable.
Steve Sumrow, owner of Aquaponics USA in Adkins, said an aquaponic system can be “functional” in a size small enough to fit on an apartment balcony. However, he said, a much larger system would be necessary in order for the it to produce adequate food to sustain a family.
“For a family of four, I’d say a system with about 75 square feet of grow space and about 500 gallons of water would be sufficient to harvest about 10 pounds of fish a month and keep enough breeders to replace the fish used,” Sumrow said. “It would also supply the family with an adequate supply of vegetables. Basically, it could produce enough vegetables for a family of four to eat each day, but probably not enough fish for each day.”
He added that aquaponic systems can also be built to use solar or wind power, though the system he described which could produce sufficient food for a small family likely use only about $15 in electricity per month to operate.
“If it’s for fun it can be done, but if it’s for business, you may want to do the math to see what’s profitable,” Masabni said. “A lot of small acreage farmers have been making just as much money from the classes and the tours of their facilities as from the sale of the fish or the plants.”
The cost effectiveness of various methods is yet to be determined for Texas commercial producers, Masabni said.
“I don’t think on a small scale it can be profitable in terms of the production part,” he said. “If you add the tours and the ‘visit the farm,’ experience, then it could be profitable. It is just a good part of a bigger picture.
“A producer can sell produce as a Community Supported Agriculture system, and sell to restaurants and farmers markets, but can also do farm tours and lectures because people want to see the fish and visit the greenhouse where the vegetables are produced.”
Done right and depending on the size of the operation, Masabni said, a producer would harvest, transplant and seed daily.
“You keep replacing what you harvest. That’s the ultimate goal, though in reality it’s often the cycle for every third day, because the operation isn’t big enough to sell and replenish daily,” Masabni explained.
Aquaponics also lends itself to extending the product’s shelf life, which could be a marketing advantage for producers.
“Harvest is different from field harvest, because we don’t cut the roots off and package it. You just remove the excess roots from the growing cup, and then you package it,” he said. “It will last a lot longer with no wilting. When the roots remain on the plant, it is still alive, so it can last a couple of weeks in the refrigerator and still taste, smell and look like it was harvested yesterday.”
Though he is concentrating on commercial aspects, Masabni said the idea is also inspiring people to try aquaponics on a smaller scale for personal consumption.
“A person might have a fish tank and have a pump that circulates the water to a small bed where vegetables are growing and then circulate the water back,” he said.
He plans to offer workshops for interested growers around the state and to do more research into production methods and economics.
“We need to answer questions such as how much nitrate is needed in the water to have a decent crop, which would determine how many fish are needed and how much to feed them,” he said. “For a commercial operation, it needs to be profitable, so you would not want to be feeding 1,000 fish if 500 is enough to give you the same vegetable crop, for example.
“A lot of research is needed as we plan for science-based programming and getting people excited about aquaponics,” he said.
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Farm & Ranch
Grazing North Texas – American Lotus
Farmers and ranchers are in a very close partnership with Mother Nature. If we really pay attention, she presents us some interesting scenarios.
For example, though they are totally different types of plants, water lilies and prickly pear have a lot in common. They both have strikingly beautiful flowers, both plants are edible, both of them are invaders into their respective habitats, and too much of either one can be an obstacle that we have to deal with.
Many north Texas ranches rely on excavated ponds for livestock water. Any time a pond contains a significant amount of shallow water so that sunlight reaches the bottom, some type of pond weed will develop. The plant family that includes water lilies and lotuses is a common invader in our livestock water.
Water lilies and lotuses are in the same plant family but they are two separate genera. There are easy ways to tell them apart:
• A primary difference is that water lily leaves commonly float on the surface, but lotus leaves can grow above the water line.
• Water lily leaves and flowers are thick and waxy, while lotus leaves and flowers are thin and papery.
• Water lily leaves have a distinct notch in the leaf, while lotus leaves are more rounded.
• Water lily flower petals are pointed, and lotus petals are more rounded.
The photos attached to this writing are from Clay County, and this plant is common across north Texas. American lotus is adapted to a wide area, from Honduras north through Mexico and across the eastern US and into Canada.
American lotus is a perennial, and it is cold tolerant and heat tolerant. It can grow in any pond or slow moving stream that contains shallow water areas. It prefers water with a depth of about 12 inches. Germination can occur from the large lotus seeds. Tubers, or roots, are established in the mud, and long slender stems extend upward. Leaves and flowers are both emergent in that they grow above the water line.
Lotus flowers are fragrant, and yellowish white with rich gold centers. They open in the morning and close by late afternoon, then open again the next day.
Lotus is an edible plant and has a history as a food source. The large tuberous roots, the size of a human arm, were baked like sweet potatoes. The leaves were eaten like spinach, and the large seeds were ground into flour. Stems taste somewhat like beets and were usually peeled before being eaten.
There is a large world-wide industry of cultivating lilies and lotuses in water gardens. According to Dr. Jerry Parsons, Professor and Extension Horticulturist with Texas A&M AgriLife Extension, cultivation of these plants dates back as early as ancient Egypt. Today, anyone with determination and a little money can have a water garden.
In 2011, the 82nd Texas Legislature designated the water lily “Texas Dawn” as the official Texas State Water Lily. Texas Dawn is a hybrid developed by Texas resident Kenneth Landon, a world-renowned expert in the field of water lilies and the director of the International Water Lily collection in San Angelo.
Ducks and other wildlife utilize the large acorn like seeds of American lotus, and submerged portions of all aquatic plants provide some form of wetland habitat. Many of us have tried to pull a bass out of a group of water lilies or lotuses, and I’m sure others have had better luck than I did. Although there can certainly be benefits to lilies, lotuses, and other aquatic plants, they can also infest ponds to the extent that the pond is not functioning correctly.
So, while the rest of the world works hard to grow these plants, ranchers sometimes need to control populations in their stock ponds. Once it gets a foot hold, American lotus can spread aggressively in wetland areas.
The primary issue that encourages American lotus, and most other water weeds, is shallow water. Look closely at a good livestock pond and you will find that the deeper water is basically free of infestation. Any pond will have a certain amount of shallow water that encourages water weed growth, depending upon the terrain at the pond site and how the pond was constructed. Some ranchers who enjoy and utilize wetland habitat may prefer to have ponds with significant shallow water area.
Almost all livestock ponds have a certain life expectancy. Siltation, or movement of soil into the pond bottom through rainfall runoff, is a natural occurrence. How fast siltation occurs into each pond, and how deep the pond was to start with, determines the length of time that the pond will contain adequate depth for dependable water for livestock.
Ponds that develop infestations of water weeds over a large percent of the surface may not have adequate depth to remain a viable water source for livestock during drought periods, especially in western north Texas where evaporation rates are higher.
Mud, or silt, from the pond bottom, can be removed to deepen the water, but this is a very expensive process. It is often more economical to construct a new pond rather than try to remove the silt from an old one. Most of us do not have the funds to continually construct deep water livestock ponds, so we must try to keep existing structures functioning and providing good drinking water for livestock, for as long as we can. Control of pond weeds like American lotus may be necessary, and it can be accomplished.
There is currently no feasible biological control. American lotus can be cut and removed, but this process us usually temporary because lotus can reestablish from seeds and roots.
American lotus can be safely controlled by chemicals. This must be done carefully. If a pond containing a large amount of any pond weeds is treated to remove all of the vegetation, a fish die-off could occur. When the dying weeds decompose, they use up the oxygen in the water and fish can suffocate. If possible, treat only a portion of the area, wait about two weeks, and treat another portion.
Farm & Ranch
The Many Benefits of Rabbit Manure
By Landon Moore
Rabbits offer a lot to the home gardener, and perhaps the most useful of all is their waste. Rabbit manure is likely the single most versatile and valuable fertilizer of any animal manure. It’s a “cold” manure, meaning it can be applied directly to plants in any form without the risk of burning them. In contrast, manure from sheep, horses, cows, and especially poultry must be aged before it’s applied, or it may damage plants. Because rabbit manure doesn’t need to be aged, it retains more of its nutrients and is therefore twice as rich as chicken manure and four times more potent than horse or cow manure. Rabbit manure is safe to apply to soil growing edible crops, has virtually no smell, and contains no harmful seeds. It can be used immediately, or be dried, powdered, made into tea, or turned into worm castings. A single trio of rabbits and their offspring can produce up to two cubic yards of fertilizer per year, along with 100 to 200 pounds of meat.
Rabbit manure is in such high demand as a fertilizer, particularly for roses, that it’s often sold online at a premium price. Some rabbitry owners even charge people to come scoop the manure themselves, paying by the bag. Larger rabbitries might sell by the truckload, but many owners keep it all for their own gardens. You may wonder what makes this little mammal’s excrement so uniquely useful. To understand, we first need to look at the qualities that make it special and then explore its various applications.
To begin with, let’s take a closer look at a rabbit’s biology. Contrary to popular belief, rabbits are not rodents but belong to the order Lagomorpha and family Leporidae, along with hares. All domestic rabbits are domesticated European rabbits (Oryctolagus cuniculus) and are unable to produce fertile offspring with American cottontails. Rabbits are considered “pseudo-ruminants” because they have a single-chambered stomach, but they also have an organ called the cecum, which functions similarly to a rumen and makes up about 40% of their digestive tract. They are crepuscular, meaning they are most active at dawn and dusk, typically feeding in the evening.
Rabbits actually produce two kinds of manure. The familiar dry pellets make up most of their waste, while the other type, known as “cecotropes,” is a moist and smelly substance resembling tiny bunches of grapes. Cecotropes are not fully digested, and because rabbits cannot chew their cud, they reingest the cecotropes as they are excreted. This fermented substance allows the rabbit to absorb more nutrients than it would through initial digestion. While cecotropes are occasionally found in cage trays, the feeding behavior that leads to them is usually only witnessed by the rabbit owner.
The dry pellets are the true manure that most people are familiar with. These small, round, dry pellets have almost no smell when kept dry. When crushed, they break down into a powder resembling tiny grass fragments because, in essence, that’s what they are. Some people crush the pellets before applying them to speed up their absorption into the soil, while others appreciate their “slow-release” feature. Additionally, the manure’s water solubility can be exploited in several ways. Soaking a wheelbarrow full of manure creates a potent sludge that can be easily applied to flat surfaces. If the odor is not an issue, the smell will dissipate once the manure is either dissolved by moisture or dried by the sun. Another method is to make manure tea: fill a cloth bag with manure, seal it, and submerge it in a barrel of water for a few weeks. A simpler method involves placing damp manure at the bottom of a barrel, filling it with water, and letting it sit in the sun for a couple of weeks. Stir occasionally, and you’ll have a powerful liquid fertilizer ready for use.
Domestic rabbits should be fed a modern, pelleted feed, which provides all the nutrients they require. This diet eliminates the risk of noxious seeds being present in the manure, making it safe to apply directly to the lawn, especially during winter. Winter and spring rains will break it down, and by late spring, you’ll have a healthy carpet of turf.
Rabbit manure’s nutrient content varies depending on factors like storage, age, and diet, but it generally contains around 2% nitrogen (N), 1.3% phosphorus (P), and 1.2% potassium (K). The Oregon Extension Service gives a range of 3-4.8% nitrogen, 1.5-2.8% phosphorus, and 1-1.3% potassium. Even at the lower end of the scale, rabbit manure has higher nitrogen content than poultry manure and twice the nitrogen content of cattle manure. One reason rabbit manure doesn’t burn plants is due to the biology of birds, which lack bladders and produce more ammonia in their waste. In contrast, rabbits release ammonia in their urine, which is why their manure may have a stronger odor.
Because of its balanced nitrogen-to-phosphorus ratio, rabbit manure promotes a wider variety of species in the same application area. Applying it directly to heavy clay soils will improve them quickly, especially when combined with other organic matter. It can also improve sandy soils by adding texture and helping them retain moisture. Anyone raising rabbits will have a steady supply of manure, as they are efficient producers. A small herd of 17 animals, including their litters, can produce about one ton of manure annually.
Beyond fertilizing, rabbit manure has several other uses. It is considered the best food for earthworms and can be combined with moisture-holding bedding like peat moss, shredded paper, or hay taken from used nestboxes. Many rabbitries (including my own) keep worm beds right under the cages. The resulting castings are rich in nutrients and can be used as-is or incorporated into soil amendments. A couple of feet of manure under a foot of soil in a hotbox can generate enough warmth to start and grow seeds, even in cold climates like Vermont.
In Europe and Asia, the rabbit meat industry is a billion-dollar market. While the Czech Republic leads in per capita consumption (over 8 pounds per person annually), China is the leading producer of rabbit meat. A recent study in China examined the effects of replacing peat moss in seed-starting soil with rabbit manure. The study found no significant difference in germination rates and noted that the manure provided increased nutrients for seedlings. The ideal ratios for seed-starting soil were found to be one-third manure, one-third perlite, and one-third vermiculite, or half manure and half perlite.
Rabbit manure is often overlooked as a nuisance, but as we can see, it’s an incredibly versatile soil conditioner, excellent fertilizer, ideal food for earthworms, and a superior seed-starting medium. Anyone raising rabbits should consider this another benefit, in addition to having a home meat supply, exhibition livestock, or pets.
Farm & Ranch
Leopold’s Legacy: The Five Tools That Shaped Conservation
By Raenne Santos
Known as the father of wildlife management, Aldo Leopold’s teachings reshaped our understanding of conservation and our role in nature. His philosophy, rooted in ethics, ecology, and action, emerged in response to the environmental degradation of the early 20th century in the American West. Overgrazed pastures, eroding soils, and changing wildlife populations revealed the consequences of treating natural resources as limitless.
Recognizing these challenges, Leopold theorized a transformative approach to land stewardship, emphasizing that the land is not merely a commodity, but a community in which we all belong. His works, A Sand County Almanac and Land Ethic, are still referenced to this day by modern conservationists. In Land Ethic, he introduced a practical framework for wildlife management known as the Five Tools of Wildlife Management, which offers land stewards a structured approach to maintaining and restoring ecological balance.
Symbolizing brush management, the axe is one of Leopold’s tools for controlling invasive species, shaping habitats, and mitigating wildfire risks. By selectively removing vegetation, land managers can enhance biodiversity, create open spaces for native species, and maintain healthy ecosystems.
Representing grazing animals, the cow (when used properly) mimics the natural disturbances once provided by bison. Grazing animals promote healthy ecosystems by aiding in nutrient cycling and soil disturbance. Responsible grazing practices prevent overuse and contribute to sustainable land management.
The plow signifies mechanical disturbance and soil preparation, crucial for habitat restoration and agricultural productivity. Used strategically, it aids in cultivating crops and creating conditions favorable to wildlife. However, misuse can lead to erosion, requiring careful application in conservation efforts.
Fire, a powerful natural tool, plays a crucial role in maintaining biodiversity and landscape resilience. Land managers use prescribed fire to control invasive species, rejuvenate plant communities, and shape habitats. Fire promotes the natural cycles of ecosystems and supports species diversity.
The final tool, the gun, is used to manage game populations and control predators. During Leopold’s time, unregulated hunting contributed to species extinction and posed threats to others. Today, hunting is strictly managed through game laws and seasonal regulations to ensure sustainable populations.
Leopold’s Five Tools of Wildlife Management continue to influence conservation practices today. While techniques have evolved, the fundamental principles remain the same—balancing human involvement with ecological processes to sustain healthy ecosystems. His approach emphasizes the importance of working with nature rather than against it. By embracing ethical land stewardship, modern conservationists honor Leopold’s vision, ensuring that future generations inherit thriving landscapes.
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