Farm & Ranch
[AgriLife Today] Wheat producers advised to take advantage of existing soil nitrogen
By: Kay Ledbetter
COLLEGE STATION – As producers across the state are planting winter wheat, it is important they consider crediting soil nitrogen in their management plans, according to a Texas A&M AgriLife Extension Service specialist.
Dr. Jake Mowrer, AgriLife Extension state soil fertility specialist in College Station, said producers can save money in fertilizer costs by taking advantage of existing soil nitrogen and still make expected yield goals.
Each year producers must determine what and how much nitrogen they will use to fertilize their crop, Mowrer said. His study is determining how soil testing can help producers know how much nitrates their soil already contains so they can credit that to their overall needs.
He said a study in the Hill Country on the effect of reducing nitrogen fertilizer applications to wheat based on soil test nitrates at depths as great as 3 feet was the first of its kind on a cool-season crop.
Previous studies on warm-season crops such as corn, sorghum and cotton suggest nitrates may be credited to 24 inches without affecting yield, Mowrer said.
“We know that crediting nitrogen fertilizer could save an estimated $23 per acre for cotton and $31 per acre on corn and grain sorghum. But what about wheat – how does it respond to this program?”
Working with a producer in Itasca on a project funded through the U.S. Department of Agriculture’s Southern Sustainable Agriculture and Research Education, he said their goal was to produce 60-bushel per acre wheat. Soil samples were taken to 48 inches prior to planting in October 2015. The soil is Houston black clay.
Nitrogen from the soil was credited in different plots down to 36 inches. The wheat was harvested June 10. The full application of nitrogen performed the same as a credit to 6 inches and 12 inches, Mowrer said.
“Our results indicate that yield in wheat was not affected by crediting nitrate-nitrogen in the soil profile to a depth of 12 inches,” Mowrer said. “However, yields in this study were adversely affected when fertilizer was reduced by crediting nitrate deeper in the profile.”
He said the reason for this may lie in the different efficiencies at which wheat takes up nitrogen already in the soil, as compared to nitrogen that is applied at the surface.
“At 24 and 36 inches, there was a range of 10-60 pounds of nitrogen,” Mowrer said. “Surface application of a liquid fertilizer was less efficient than recovery of existing soil nitrate. This result will be explored more closely in the next growing season.”
Mowrer said soil fertility is the most limiting factor in plant growth, right after water.
“We know the best you can do productionwise is determined by the amount of water. Nitrogen is the input needed for crops right behind water.”
And, he said, the timing of any necessary fertilizer applications once the soil testing is done will affect the growth of wheat.
“We recommend putting out a third of the nitrogen upfront, and then right before jointing put out the other two-thirds,” Mowrer said.
“But remember, we can’t manage the rate unless we know what is in the soil to begin with,” he said. “Voluntary soil testing isn’t as widespread as we would like to see it. Soil testing is a really, really important part of managing our nutrients, particularly for nitrogen.”
Mowrer said his recommendation is to put about 1.5 pounds of nitrogen for grain production or 2 pounds per acre of nitrogen for grass.
“If there is some nitrogen in the soil, we can adjust that rate,” he said. “But you don’t know what is there unless you test it. We recommend you can credit what you find all the way down to 2 foot.”
Another study he is working on is examining the different root systems to see if they make a difference in what nitrogen can be utilized, as well as determining if types of soils matter.
Following up on the results in the previous year’s wheat study will be a top priority in the coming season, Mowrer said.
“Although topdressing with surface applications is the recommended procedure for wheat at jointing, there are new technologies for fertilizer delivery that may hold the potential for increased nitrogen-use efficiency over what we see today with stream bars and tips.”
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Farm & Ranch
Acorn Toxicity
By Barry Whitworth, DVM, MPH
With the prolonged drought, most pastures in Oklahoma end up in poor condition. With the lack of available forage, animals may go in search of alternative foods.
If oak trees are in the pastures, acorns may be a favorite meal for some livestock in the fall. This may result in oak poisoning.
Oak leaves, twigs, buds, and acorns may be toxic to some animals when consumed.
To read more, pick up a copy of the November edition of North Texas Farm & Ranch magazine, available digitally and in print. To subscribe by mail, call 940-872-5922.
Farm & Ranch
Silver Bluestems
By: Tony Dean
There are a handful of grasses on North Texas grazing lands ranchers need to know, not because they are highly desirable, but rather because they are not of much value. I call them “decom” plants, which is am acronym for “Don’t Ever Count On Me.” Silver bluestem is a “decom” grass.
Silver bluestem is a perennial which grows in all areas of Texas. It can survive in almost all soil types, and in full sun conditions or in semi shade. It grows up to three feet tall and is easily recognized with the presence of the white fuzzy seed head. Also, one of the identifying characteristics of Silver bluestem is a bend in the stems at each node, causing the plants to take on a rounded shape as they mature.
To read more, pick up a copy of the November edition of North Texas Farm & Ranch magazine, available digitally and in print. To subscribe by mail, call 940-872-5922.
Farm & Ranch
Meanwhile Back At The Ranch
By: Rayford Pullen
Fall is here which means winter is closing in on us and before we officially get into winter, we need to make sure our factories are either producing or will be producing in a few months.
We have been pregnancy testing our cows this fall and if they are not bred or nursing a calf, we are bidding them adios. With annual costs somewhere between $900.00 and $1,000.00 per cow, those cows not producing a live weaned calf are costing us quite a bit.
To read more, pick up a copy of the November edition of North Texas Farm & Ranch magazine, available digitally and in print. To subscribe by mail, call 940-872-5922.
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