Corn Farm Research Nutrient / Soil Fertility Studies
Farm research studies in this section include nitrogen rate/application/timing studies, manure application, laboratory comparisons, and other nutrient studies.
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Related NebGuide: Soil and Water Summaries for 2005-2006.
Nitrogen Rate/Application/Timing Studies
Objective: Determine the profitability of using 11-52-0 surface
broadcast prior to planting in a corn and soybean rotation.
Summary: The application of 11-52-0 broadcast increased seed yield of soybeans
in 1997 and 1999. Corn grain yields were increased by the 11-52-0 broadcast in 1998. In 2000,
phosphorus broadcast increased grain yield (9 bu/ac) and test weight (0.4 lbs/bu). Tillage also
increased grain yield (10 bu/ac) and reduced grain moisture at harvest slightly. In 2001
broadcast phosphorous increased the seed yield of soybeans 6 bu/ac. In 2002, broadcast phosphorus
increased grain yield and test weight and reduced grain moisture at harvest. Tillage done in 2000
and 2001 resulted in reduced yields and grain moisture at harvest and increased test weights in
2002. Residual effects of phosphorus gave increased seed yield and a slight increase in seed
moisture in 2003.
- 2004-2005 D.Schlichtemeier Using 11-52-0 in No-Till
- 1997-2003 R.Smith Using 11-52-0 in Corn/Soybean Rotation
Objective: Determine the profitability of anhydrous ammonia fertilizer
verus liquid (28%) fertilizer at two application rates in corn production.
Summary: (Minchow) The anhydrous ammonia fertilizer treatments yielded
significantly higher than the liquid (28%) fertilizer treatments. High rate treatments of both
fertilizer sources also produced significantly higher yields than low rate treatments.
(Hellerich) A significant yield difference was found between the preplant and split sidedress
fertilizer applications. Although fertilizer rates did not significantly impact yield,
application timing did. It appears that delayed application was beneficial, however, further
testing is desirable.
- 1994 M.Minchow Lancaster Co. Anhydrous vs. Liquid N
- 1994 G.Hellerich Lancaster Co. Anhydrous vs. Liquid N
Objective: Determine and document the effect of ammonia placement on
the profitability of non irrigated corn production.
Summary: In 2005 & 2006, ammonia placement had no effect on yield or
grain moisture of corn at harvest.
Objective: Determine the profitability of two liquid nitrogen
application rates at planting and two sidedress anhydrous ammonia rates in corn production.
Summary: In 1994 anhydrous ammonia sidedress fertilized corn yield was
significantly higher than liquid (28%) nitrogen treatment. High rate treatments of both anhydrous
ammonia and liquid (28%) nitrogen yielded significantly higher than low treatment rates. The
interaction among fertilizer sources and rates was also significant to yields. The low rate of
liquid (28%) yielded poorly. In 1995 yields were increased by higher rates of liquid nitrogen,
but not by anhydrous ammonia. Nitrogen loss was observed during the high rate application of
anhydrous ammonia. In 1996 yields were increased by higher rates of nitrogen. There was no
difference between liquid and anhydrous ammonia fertilizers.
Objective: Determine the profitability of using UAN with two percent
attapulgite versus UAN alone in irrigated corn production.
Summary: In both studies, the application of attapulgite clay had no
significant effect on the yield or grain moisture of corn in 2007. UAN (180 lbs. N/ac) with
attapulgite clay that was applied on May 11 (McKenzie). UAN (84 lbs N/ac) with attapulgite
clay was applied with planter (Mulliken).
- 2007 D.McKenzie Dodge Co. Use of Attapulgite in Corn Production
- 2007 J.Mulliken Dodge Co. Use of Attapulgite in Corn Production
Objective: Determine and document the profitability of nitrogen
fertilizer rates and application timing in irrigated corn.
Summary: In 2006, the rate of applied nitrogen had no significant effect
on grain yield (weigh wagon or monitor) or grain moisture in either study. NH3 cost $490/T, NH3
application cost included ($7.40/ac) UAN cost $245/T. UAN application cost included ($5/ac). In
2007, increasing the rate of applied nitrogen resulted in an increase in grain yield (weigh wagon
or yield monitor), however, there was no significant difference between the highest rate (158
lbs/ac) & the UNL economic rate (119 lbs/ac). Grain moisture at harvest was not affected by
rate of applied nitrogen. In 2008, grain yield was highest with the highest rate of applied
nitrogen in both studies. Splitting the application also resulted in maximum yield in the
irrigated study. Grain moisture at harvest was not affected by nitrogen treatment. Results were
the same using weigh wagon or monitor.
- 2006-2008 ARDC Saunders Co. N Timing and Rate in Limited and Irrigated Corn
- 2006 M.Schroeder Saunders Co. N Rates in Limited Irrigated Corn
Objective: Determine the profitability of using starter fertilizer
versus using none in corn production.
Summary: Variable results occurred regarding increased grain yield from
addition of starter fertilizer in these studies. (Uehling) The use of starter resulted in a
significant increase in grain yield in 2005, but not in 2006 or 2007. (Quad) Starter
fertilizer showed no significant yield advantage when compared to no starter on seven irrigated
corn fields in south central Nebraska. (Schmidt) The use of starter fertilizer resulted in
slightly drier grain at harvest and a slight increase in grain yield. (Hanke) Use of
starter fertilizer increased early growth and grain yield and resulted in lower grain moisture at
harvest in 1997-1998. There was not a significant difference in performance between the two
starter fertilizers. (Ohnoutka) Soybean seed yields were increased by starter fertilizer
(10-34-0), in 1997. No differences were detected in the corn comparison. In 1998 starter
fertilizer use resulted in slightly drier corn at harvest and slightly lower test weight. No
differences were detected in the soybean trial.
- 2005-2007 J.Uehling Dodge Co. Starter vs. None
- 2005-2006 J.Uehling Dodge Co. Starter vs. None
- 2005 Quad Co. Research Starter vs. No-Starter Irrigated Corn
- 1998 B.Schmidt Washington Co. Starter vs. No-starter Irrigated Corn
- 1997-1998 G.Hanke Saunders Co. Two Starter Fertilizers vs. No-starter Rainfed Corn
- 1997-1998 K.Ohnoutka Starter Fertilizer in Corn-Soybean Rotation
Objective: Study effect of side-dress Nitrogen application on corn
production and profitability
Summary: The addition of 40#/ac. side-dress Nitrogen did not result in an
increase of rainfed corn yield (Fujan 2012). The addition of 35# and 60# of nitrogen per
acre sidedressed, did no increase irrigated corn grain yield, moisture or test weight (Sladky
2012).
Objective: Study effect of starter application on corn production and
profitability
Summary: There was no signficiant difference in yield between 10-34-0 + zinc vs.
SuperStarter in 2012 (Makovicka). Based on only two replications there was a significant increase
in yield of all treatments compared to the check in 2012. The cost of some of the treatments was
not justified based on this year’s data. The starter (10-34-0) had the best return on investment.
(Stahr)
Manure Application
Objective: Determine the profitability of using feedlot manure as a
replacement for commercial fertilizer.
Summary: (Hanson) In 2001 the use of multi-nutrient fertilizer and either
manure source produced similar corn yields. Soybeans produced the same seed yield with the manure
sources, but the no fertilizer treatment was lower than the other treatments. In 2002 the use of
multi-nutrient fertilizer and both manure sources produced the same corn yields. Manure from the
west lagoon produced slightly lower seed yield in soybeans. Grain moisture of corn at harvest was
the highest where only nitrogen fertilizer was applied. Using a multi-nutrient fertilizer
resulted in lower grain moisture which was reduced further when manure was applied. In 2003 corn
yields in corn following corn were highest following residual mixed fertilizer or manure. Yields
were not affected when corn followed beans. Grain moisture at harvest was not affected by
treatments.
(Larson) The application of K and S in addition to NPZn increased grain yield significantly in
1999. Yield from this treatment was equal to the yield from manure. Test weight was slightly
lower for the NPZn treatment when compared to the NPKSZn treatment. There was a slight carry-over
effect on soybeans in 2000. Seed yield from the manure treatment was slightly higher than from
the NPKSZn treatment. In 2001 grain test weight was increased by KS and increased more by manure.
Yield and grain moisture were not affected by treatments.
(Moravik) The application of 30 tons of manure per acre (230 lbs/ac plant available nitrogen)
resulted in a grain yield that was higher than was achieved with 180 lbs/ac nitrogen from
commercial fertilizer. The addition of nitrogen with the manure increased yields above manure
alone. (Bartek) Use of manure resulted in higher grain yields than using commercial fertilizer in
1996, however, the grain was wetter at harvest. In 1997 soybean seed yield was higher where
manure was applied in 1996. In 1998 corn grain drier where manure was applied in 1996. Grain
yield was also significantly different.
(RaikesField1) Corn yields were the same for manure treatments and for fertilizer treatments
except for the treatment designated "fertilizer only." The reason is unknown. This treatment had
the lowest average plant population, however, plant population was not related to treatment and
this treatment had an average population similar to the liquid 1996 treatment. The use of manure
did result in higher grain moisture at harvest and a slightly lower grain test weight in corn in
1996. The application of manure had no effect on soybeans in 1997.
(RaikesField2) In 1996 the use of manure prior to growing soybeans resulted in a reduction in
seed yield and a lower test weight. The use of manure did not affect seed moisture at harvest,
however, the use of liquid manure did give slightly lower seed moisture than where solid manure
was used. The application of manure in 1997 resulted in higher grain moisture and lower
yields as compared to treatments that received fertility only or fertilizer in 1997 and manure in
1996.
- 2001-2003 D.Hanson Saunders Co. Beef Feedlot Manure vs. Commercial Fertilizer
- 1999-2001 R.Larsen Saunders Co. Mead Feedlot Manure vs. Commercial Fertilizer
- 1998-1999 K.Moravek Saunders Co. Feedlot vs. Commercial Fertilizer on Sandy Soils
- 1996-1998 B.Bartek Saunders Co. Manure as a Phosphorus Source
- 1996-1997 R.Raikes Saunders Co. Manure vs. Commercial Fertilizer-Field 1
- 1996-1997 R.Raikes Saunders Co. Manure vs. Commercial Fertilizer-Field 2
Laboratory Tests and Credits
Objective: Determine the profitability of nitrogen application rates
based on soil organic matter content.
Summary: Corn yields were increased with each increment of nitrogen
applied. Test weight was reduced by the lowest rate of nitrogen applied. Plant population was
slightly higher at the mid-rate of nitrogen, however, population does not appear to be a factor
in grain yield.
Objective: Determine the profitability of fertilizer treatment
recommendation by two different soil laboratories.
Summary: In 2004, soybean growth was not influenced by fertilizer
treatment. Corn growth was not affected by fertilizer treatment in 2005. In 2006, soybeans
fertilized according to commercial laboratory yielded slightly more than the other treatments.
Soybeans from plots that received only nitrogen on corn the previous year were slightly drier at
harvest., In 2008, soybeans fertilized according to a commercial seed laboratory had wetter seed
at harvest compared to UNL or none treatment.
Objective: Compare different methods of crediting legumes and determine
the profitability of three treatments in corn/soybean rotation.
Summary: Based upon 2004-2005 data in South Central Nebraska, under
irrigated conditions, producers should be able to credit 1lb of nitrogen/bu. beyond the 45 lbs
where beans yield 65 or 75 bushels and be fairly safe. It would be a good idea to collect some
soil samples for residual nitrogen following soybeans and conduct some strip tests on your
individual farm to see responses under your conditions.
Other Nutrient Studies
Objective: Determine the profitability of phosphorus fertilizer
placement in the production of corn and soybeans.
Summary: The use of phosphorus fertilizer significantly increased grain
yield in 1999. Broadcast application increased yield above the no phosphorus treatment, and
banded application increased yield above the broadcast treatment. Test weight was increased by
both phosphorus treatments. There was no carryover effect on soybeans in 2000.
Objective: Determine the profitability of using potassium fertilizer in
a corn and soybean rotation.
Summary: In 2001 potassium had no effect on corn growth and yield. Plant
density was reduced very slightly. In 2002 soybean growth and seed yield were not affected by
residual potassium applied in 2001. In 2003 the application of potassium increased grain test
weight slightly. In 2004 residual potassium from 2003 had no effect on the growth and yield of
soybeans.
Objective: Determine the profitability of using APSA-80 soil
conditioner, Nutriplant seed treatment in irrigated corn.
Summary: Applied treatments had no significant effect on grain yield,
grain moisture, test weight or harvest populations in 2007.
Objective: Determine the profitability of using iron fertilizer on
corn.
Summary: (Buller) Grain yield was not affected by the fertilizer treatment,
however, grain moisture was lower at harvest where fertilizer was applied. This product was prone
to clotting and plugging screens. (Soukup) The use of iron fertilizer resulted in a
significant reduction in grain yield. Reason cannot be explained. No differences were observed in
field during crop growth.
- 2007 L.Buller Saunders Co. Iron Chelate on Corn
- 1996 J.Soukup Saunders Co. Iron Fertilization of Corn
Objective: To determine & document the effect of replacing commercial
fertilizer with alternate products on the profitability of corn production.
Summary: Grain yields and grain moisture at harvest were not affected by any of
the treatments applied in 2009.
Objective: To determine & document the effect of using Torque on the
profitability of producing corn.
Summary: Torque had no effect on grain yield; however, moisture at harvest was
slightly lower.
Objective: To study the effect of Generate Starter on corn production and
profitability.
Summary: The Generate treatment did not result in an increase of irrigated corn
yield.
Objective: Study effect of sulfur on corn production and
profitability
Summary: For this study with hybrid Big Cob 15-80, there was no statistical
yield difference due to the addition of sulfur.