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[AgriLife Today] Critical Texas drought forecast may alter summer crop planting decisions

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By: Kay Ledbetter

Writer: Kay Ledbetter, 806-677-5608, skledbetter@ag.tamu.edu
Contacts: Dr. Jourdan Bell, 806-677-5600, jourdan.bell@ag.tamu.edu

AMARILLO – The Texas High Plains is under extreme drought and if current conditions continue, producers need to make important decisions for summer crops, said Dr. Jourdan Bell, Texas A&M AgriLife Extension Service agronomist in Amarillo.

Dr. Jourdan Bell, Texas A&M AgriLife Extension economist, said the lack of moisture over the winter may have High Plains producers tweaking their planting decisions. (Texas A&M AgriLife photo by Kay Ledbetter)

“The current U.S. Drought Monitor is reporting we are in a Stage 4 drought,” Bell said. “With that, many producers are having to make critical management considerations as they are approaching summer planting season.”

Fortunately, the region’s extended precipitation forecast is improving, she said. The National Weather Service Climate Prediction Center is now predicting the region will have equal changes of above or below average precipitation.

“What does that mean for a producer? Well hopefully it will not be as dry as previously predicted, but we still do not have a positive forecast,” Bell said. “Unfortunately, temperatures are still projected to be above average, and because temperatures are a key driver in crop water use, we are still at risk for crop stress under dryland and limited irrigation.”

With summer planting, it is important to know how much moisture is in the soil profile, “because that is our bucket,” Bell said. “With that, it’s also important to know what crops will be planted and what is their rooting depth. That will help us determine how much subsoil moisture we have and how far it will carry a crop through the growing season, especially if we don’t receive timely moisture.”

https://youtu.be/8KarmF-Y_uA

 

Many producers are having to pre-irrigate, so they can have sufficient moisture in the seed zone to germinate summer crops, she said. Under dryland situations, producers are having to decide if they are going to postpone planting.

“Our current forecast is actually calling for precipitation. If we do get rain, many producers are evaluating how soon they will plant dryland acreage,” Bell said. “But even with a precipitation event, it will depend on the amount of rain we receive and the rate it falls to determine the effectiveness of the precipitation event. One rain is not going to break the drought situation we are in.”

Subsoil moisture is only about 4-6 inches below the surface in fields where residue was left standing. (Texas A&M AgriLife photo by Kay Ledbetter)

The Texas High Plains is dependent on winter precipitation in the form of snowfall to build up soil moisture during the fallow period, she said. Across the region, negligible snow fell this winter and rainfall has been anywhere from less than a tenth of an inch to about 3/10s of an inch for the entire winter.

“On the bright side, we are very fortunate because we had very good early fall precipitation, so in many areas we still have good subsoil moisture,” Bell said.

She estimated under no-till and especially under good residue, soil moisture may be 4-6 inches deep; under cultivated or tilled ground, subsoil moisture may be 8-10 inches.

“It is important for producers to evaluate the depth to moisture before they begin to pre-irrigate,” Bell said. “Soil moisture sensors are an invaluable tool not only for scheduling in-season irrigation, but also determining how much pre-irrigation is needed.”

That subsoil moisture also allows dryland producers to gauge precipitation in the forecast to determine if it will give them enough moisture to plant on, she said.

“Even if we receive up to a half inch, that’s probably not going to be enough, because roots will not grow through dry soil to reach the wetter subsoil.”

The primary crops grown in this region under irrigation are corn and cotton, she said. As producers evaluate the forecast and probability of precipitation, many are opting to split irrigated acreage between corn and cotton so they will have sufficient water to meet critical crop water demands throughout the summer.

“For crop insurance purposes, corn needs to be planted on or before June 5 for counties in the Texas High Plains, but planting later in June shifts the critical water demand period of tasseling out of some of the hotter periods of summer,” Bell said.

“Often we will see greater kernel set and sometimes benefits by planting that crop even later in the summer. So, producers have to evaluate how they manage their insurance programs with regards to their planting times.”

For grain sorghum under both irrigated and dryland production systems, producers do have flexibility with planting dates, she said.

“We do find producers are able to make a very good sorghum crop, even planting into late June. That does provide a little bit a flexibility as they watch the weather,” she said. “They can wait and plant the crop if we receive timely rains. Also, planting later will move that critical growth stage of growing-point differentiation and flowering later into the season when we are not as hot. Sorghum does have a little more flexibility than cotton.”

When it comes to cotton across the High Plains, it is important for producers to get the crop planted in May because “we are trying to grow a perennial crop in a very short annual environment,” Bell said. “In order to accumulate sufficient growing degree days or heat units to mature that crop and optimize production – not just yield but also quality – we really need to get that crop off and running in May and preferably early to mid-May if conditions are favorable.”

Another challenge producers may have, especially under dryland conditions, is herbicides, she said. In some years, sufficient precipitation is not received to activate some of the residual preplant herbicides.

“Preplant herbicides are very important because we want to minimize competition with our primary crop,” Bell said. “We want to start the season weed free. Weeds are using water we need for the crop, so they must be managed.”

All these decisions can be tricky because producers often have made their seed selection months ago, she said. So moving into a dry period there might be some limitations on the decisions a producer can make.

“Irrigation helps stabilize production and minimizes the risk we encounter under dryland,” Bell said. “But across much of the High Plains, well capacities are no longer sufficient to meet crop water demands to optimize economical production. And often our precipitation, while aiding crop water demand throughout the season, doesn’t come at the most ideal time.”

She said the High Plains often receives non-beneficial precipitation. Rain events may only measure a few hundredths of an inch or 2-3 inches may fall in a very short time and a large percentage of this runs off. Neither event benefits crop production.

“Really, what we want to see are those slow, steady rains that come over the course of several days and soak in, wet up that profile, and really provide soil moisture.”

Traditionally the best rains in this region fall in May and June, and that offers hope for the coming crop season, in spite of the current drought, Bell said.

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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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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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