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[AgriLife Today] Water conservation policy effectiveness depends on farmer economics

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New sprinkler emitters may help farmers improve water efficiency on crops, but not necessarily save water in the long run. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

By: Kay Ledbetter

Writer: Kay Ledbetter, 806-677-5608, skledbetter@ag.tamu.edu
Contacts: Dr. Seong Park, 940-552-9941, scpark@ag.tamu.edu

VERNON – Farming is a business, and the actions of farmers will be based on economics – even when it comes to water conservation, according to a recent study by Texas A&M AgriLife Research.

Extremely small recharge rates in the Ogallala Aquifer indicate depletion is inevitable, and that has policymakers scrambling to find ways to prolong its life and ensure a smooth transition to the dryland production to minimize impacts on the overall economy, said Dr. Seong Park, AgriLife Research economist in Vernon.

Park said, however, not all tools proposed or implemented by policymakers will be effective in working toward that goal.

The paper, “Will farmers save water? A theoretical analysis of groundwater conservation policies,” was recently published in the Water Resources and Economics journal and provides a look at the alternatives being offered and their potential to conserve water.

The study was conducted by Park; Dr. Tong Wang, former AgriLife Research post-doctoral researcher now in the South Dakota State department of economics, Brookings, South Dakota; and Dr. Hailong Jin, in the Black Hills State University College of Business and Natural Sciences, Spearfish, South Dakota. Funding was provided through the U.S. Department of Agriculture-Agricultural Research Service Ogallala Aquifer Program.

Using the Ogallala Aquifer as an example, their paper analyzes whether current and potential groundwater conservation policies across the Southern Great Plains provide profit-driven farmers with incentives to save water.

New sensor tools help farmers improve water efficiency on crops, but may not save water in the long run, according to a recent Texas A&M AgriLife Research study. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

New sensor tools help farmers improve water efficiency on crops, but may not conserve water in the long run, according to a recent Texas A&M AgriLife Research study. (Texas A&M AgriLife Communications photo by Kay Ledbetter)

“We wanted to focus on the incentives provided by selected policy tools to ensure water savings on the farmer’s side and achieve the sustainability goal,” Park said.

He said their theoretical study of the impacts of different policy options on groundwater conservation potential was conducted after previous studies determined voluntary and incentive-based water conservation programs may have “unintended or even perverse consequences.”

“Very few attempts had been made to analyze the effectiveness of different policy alternatives in incentivizing an individual farmer to actually save water,” Park said. “We also wanted to look at the effectiveness of the alternatives based on regional characteristics such as groundwater depth, satiation thickness and feasible crop patterns.”

He said a majority of existing literature modeled the future depletion rate of the Ogallala Aquifer from the perspective of a regulatory agency that can allocate water use effectively and in an efficient manner.

However, farmers tend to make short-term decisions in response to current output prices and input costs without considering long-term profit consequences.

“What we found was that in order to achieve the water-saving goals in regions with high pumping cost, rather than providing a subsidy for the new technology installation or charging a unit water tax, policymakers should offer a unit subsidy for saved water and a subsidy for water-conservation crops,” Wang said. “These are more promising to achieve water savings, as it directly rewards farmers for actual water saved.”

Water rights retirement programs or water buyout programs are an example of providing compensation on a land basis for farmers willing to retire their water right, she said.

“However, our results show a fixed compensation rate tends to attract the land with low productivity and high water cost, thus compromising the program’s effectiveness because most of the enrolled land initially did not use much irrigation water.”

Wang said conceptual models on farmer incentives rarely take these factors into account, so their study filled in those gaps.

“We studied farmer’s incentive-driven responses to the following policy tools: irrigation technology subsidies, increased water costs, unit subsidies for water savings and subsidies on water-conservative crops,” she said.

Wang said they found in regions with high pumping costs, no water savings will occur after converting to a more efficient technology. Instead, farmers take advantage of the new technology to pursue increased profit.

“While the technology subsidy can be effective in the preventative stage, or before the water table declines too much, it is often unjustified when water depletion is already a serious problem,” she said.

Similarly, they noted, an increase in water cost may serve its purpose if well pumping capacity is not a constraint. However, if well pumping capacity is limited due to falling groundwater levels, the cost increase may not be practical because water usage will not respond to the small price increase.

“To achieve the required water savings goal, it often takes a large price increase, which is detrimental to the farmers’ profit and is likely to be met with resistance on implementation,” Wang said.

“We found that policy alternatives such as a subsidy for unit water saved and price subsidy for water-conservative crops is likely effective in achieving water conservation even in the case of high pumping costs,” she said. “Therefore, in areas where groundwater is already a constraint, these direct rewards serve the conservation purpose better.”

Compared to the subsidy of new technology, a subsidy for water saved discourages the farmer from using the saved water to gain additional profit, while a subsidy for water-conservative crops discourages farmers from switching to more water-intensive crops, Wang said.

Beyond the policy implications, the researchers questioned: Among the farmers who adopt more efficient technologies, is there any relationship between water-use adjustment and pumping cost? And, prior to the enrollment, is the average irrigation amount of the land enrolled in a water buyout program comparable to that of the land outside of the program?

Park said future studies should examine the relationship between water pumping cost, crop price and crop patterns to identify the proper price subsidy to more water-conservative crops to achieve the water conservation goal.

“Theoretical modeling from the farmer’s standpoint as well as empirical studies based on farm-level data in different regions could provide policymakers with more detailed information on the extent of water savings by the varied water-conservation policy tools,” he said. “After all, it is the farmers who make the water-conservation decisions.”

The full paper can be found at http://www.sciencedirect.com/science/article/pii/S2212428415300128.

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Grazing North Texas – American Lotus

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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.

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The Many Benefits of Rabbit Manure

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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.

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Farm & Ranch

Leopold’s Legacy: The Five Tools That Shaped Conservation

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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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