frIday, Jan. 31, 2014
farM neWS / fort dodge, IoWa
2014 Corn Edition
ISU: Micronutrients are OK, but ...
zinc were used as a mixture.” The ISU professor said he was not surprised by the results. He said the twoyear trials were built on former research conducted in Iowa from 1965 to 1990, which also showed no yield response, whether up or down, based on applications of micronutrients. There are six primary micronutrients his study used — boron (B), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo)
and zinc (Zn). Mallarino said he thinks the reason there is no response is that either there is plenty of these elements in the soil already, or soils are getting the needed micros through manure applications on fields. He said Fe, Mn, B, Zn and Cu are found in dairy manure, swine waste and poultry litter. He said the problem with applying micronutrients is that it’s hard to diagnose when they are needed.
“Other than iron in soybeans and zinc in corn,” Mallarino said, ‘deficiencies in the region are isolated and not well documented.” In addition, soil testing is geared better for phosphorus, potassium, nitrates and pH levels. Tissue sampling row crops is also hard for diagnosing micro deficiencies since it’s hard to sample early enough to correct the problem, plus there is no field calibration data in Iowa or Minnesota for mak-
ing the adjustments. “If there is no yield response,” Mallarino said, “we can’t calibrate it.” The 2012 and 2013 test trials were conducted on 42 soybean plots, mostly on farmers’ fields and seven corn plots on ISU research farms. Micros tested were B, Cu, Mn and Zn and a mixture, all replicated four times. Micros were foliarapplied on corn at the V6 stage and on soybeans between R1 and R3. Another trial soil-applied the micros in eight corn and eight soybean plots. In all the trials there was no significant yield response, Mallarino said, with the exception of “a small average annual yield decrease from the (micronutrient) mixture each year.” How this applies to producers, Mallarino said, is to understand that yield is not necessarily an indication of micronutrient needs. “Don’t trust soil or plant tissue tests, except DTPA (diethylene triamine penta acetic acid) test for zinc,” he said. “Apply zinc for corn if you have less than 1 part per million.” He told the audience to lime acidic soils and avoid planting in sandy, badly eroded areas and soils ladened with calcium carbonate.
used during the same quarter last year.
up 30 percent from Dec. 1, 2012. Of the total stocks, 6.38 billion bushels are stored on farms, up 39 percent from a year earlier. Off-farm stocks, at 4.05 billion bushels, are up 17 percent from a year ago. The September to November 2013 quarter indicated disappearance is 4.32 billion bushels, compared with 3.74 billion bushels during the same period last year. Soybeans stored in all
positions on Dec. 1, 2013 totaled 2.15 billion bushels, up 9 percent from Dec. 1, 2012. Soybean stocks stored on farms totaled 955 million bushels, up 5 percent from a year ago. Off-farm stocks, at 1.19 billion bushels, are up 13 percent from last December. The indicated disappearance for September to November 2013 totaled 1.28 billion bushels, up 4 percent from the same period a year earlier.
Oats stored in all positions on Dec. 1, 2013 totaled 48 million bushels, 34 percent below the stocks on Dec. 1, 2012. Of the total stocks on hand, 25.6 million bushels are stored on farms, down 2 percent from a year ago. Off-farm stocks totaled 22.4 million bushels, down 52 percent from the previous year. Indicated disappearance during September to November 2013 totaled 15.5 million bushels.
67 test plots show no yield response in 2012, 2013 By LARRY KERSHNER email@example.com
FORT DODGE — Anyone who’s paid attention to corn and soybean input advertisements have heard row crops need micronutrients for growth quality and were introduced to ag products that contain one or a mix of Antonio micronutriMallarino ents. Farmers can apply micros if they want, said Dr. Antonio Mallarino, an Iowa State University professor of soil fertility and nutrient management, especially if soil testing shows zinc at less than one part per million. “But in my mind,” Mallarino said, “it’s a just-incase application anyway. “It’s more important to be right with your N, P and K applications.” N, P and K are the chemical symbols for nitrogen, phosphorus and potassium, or potash, respectively.
Mallarino had just spent 40 minutes explaining to an audience of more than 50 the history of research on yield responses of corn and soybeans with micronutrient applications from 1965 to 2013. One of the more intense trials conducted in 2012 and 2013, he said, showed that after 67 different test plots of corn and soybeans, “there was no yield response in any trial,” he said. “If anything there was a slight drop when copper and
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Iowa oats stocks stored in all positions on Dec. 1, 2013 totaled 4.5 million bushels, 21 percent below the stocks on Dec. 1, 2012. Of the total stocks, 36
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-Farm news photo by Larry Kershner
DR. ANTONIO MALLARINO, an Iowa State University professor of soil fertility and nutrient management, speaks to Webster County farmers on Jan. 22 about corn and soybean yield responses to micronutrients. Mallarino told his audience that research from 1965 through 1990 and additional test plots in 2012 and 2013 have shown no yield responses in the two row crops when micronutrients have been applied.
percent were stored onfarm. The September to November 2013 indicated disappearance is 624,000 bushels, 30 percent less than the 891,000 bushels
U.S. Corn stored in all positions on Dec. 1, 2013 totaled 10.4 billion bushels,
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