Rate: 1.3 lbs. / Bu. of yield goal Timing 1/3 or less @ planting 2/3 or more @ sidedress Source/Application method Urea sources may volatilize on surface.

Rate: 1.3 lbs. / Bu. of yield goalTiming

1/3 or less @ planting2/3 or more @ sidedress

Source/Application methodUrea sources may volatilize on surfaceInject N-sol or minimize broadcast amountAmmonium nitrate preferred for broadcast

Rate: 1.3 lbs. / Bu. of yield goalTiming

1/3 or less @ planting2/3 or more @ sidedress

Source/Application methodUrea sources may volatilize on surfaceInject N-sol or minimize broadcast amountAmmonium nitrate preferred for broadcast

Nitrogen FertilityNitrogen Fertility

0

20

40

60

80

100

0 10 20 30 40 50 60 70 80 90 100 110 120

V6 V12 Silk Milk Dent P.MV6 V12 Silk Milk Dent P.M

% of Uptake

% of Uptake

Corn Nitrogen UptakeCorn Nitrogen Uptake

Sidedress N Placement

Sidedress N Placement

Fibrous, lateral root systemNitrogen is mobile in soil Avoid root pruning

Fibrous, lateral root systemNitrogen is mobile in soil Avoid root pruning

Row middle is preferable

Row middle is preferable

Beneficial before tasselAmount dependent on height

Corn less than 3 ft: 200 lbs/aCorn taller than 3 ft: 100 -150 lbs/a.

Ammonium nitrate is preferredUrea is volatile when broadcast

Foliar N = No response

Beneficial before tasselAmount dependent on height

Corn less than 3 ft: 200 lbs/aCorn taller than 3 ft: 100 -150 lbs/a.

Ammonium nitrate is preferredUrea is volatile when broadcast

Foliar N = No response

Supplemental Nitrogen

Supplemental Nitrogen

Poly vs Orthophosphates

Poly vs Orthophosphates10-34-0

50% of P as orthoMore nitrogenLess expensive

10-34-050% of P as orthoMore nitrogenLess expensive

3-18-18Contains KLess corrosiveMore expensive

3-18-18Contains KLess corrosiveMore expensive

No difference in field studiesNo difference in field studies

Starter Fertilizer SourcesStarter Fertilizer Sources

Precision is criticalDon’t plant in the mudMinimal soil temp of 50° FCalibrate and check in the fieldLubricate planter and seedPlant 1 ½ - 2 inches deepDrive slow < 5mph

Precision is criticalDon’t plant in the mudMinimal soil temp of 50° FCalibrate and check in the fieldLubricate planter and seedPlant 1 ½ - 2 inches deepDrive slow < 5mph

Corn Planting RulesCorn Planting Rules

Yield Response to Plant Population

Yield Response to Plant Population

75

80

85

90

95

100

18000 24000 30000 36000 42000

Irrigated

Dryland

Plants per AcrePlants per Acre

Yield (% of max.)Yield (% of max.)

Dryland Seeding Chart

SeedingRate

Seed Spacing (inches) Final Stand

30-inch 38-inch 40-inch 5% loss 10% loss

24000 8.7 6.9 6.5 22800 21600

26000 8.0 6.3 6.0 24700 23400

28000 7.5 5.9 5.6 26600 25200

30000 7.0 5.5 5.2 28500 27000

32000 6.5 5.2 4.9 30400 28800

34000 6.1 4.9 4.6 32300 30600

36000 5.8 4.6 4.4 34200 32400

Irrigated Seeding Chart

SeedingRate

Seed Spacing (inches) Final Stand

30-inch 38-inch 40-inch 5% loss 10% loss

24000 8.7 6.9 6.5 22800 21600

26000 8.0 6.3 6.0 24700 23400

28000 7.5 5.9 5.6 26600 25200

30000 7.0 5.5 5.2 28500 27000

32000 6.5 5.2 4.9 30400 28800

34000 6.1 4.9 4.6 32300 30600

36000 5.8 4.6 4.4 34200 32400

VE V6 V12 VT/Silk Milk Dent Mature

0 20 40 60 80 100 120 140

VE V6 V12 VT/Silk Milk Dent Mature

Corn Physiological DevelopmentCorn Physiological Development

Apr 1 May 1 June 1 Aug 1July 1

DrydownVegetative Stages Reproductive Stages

Corn Nutrient RequirementsCorn Nutrient RequirementsCrop Yield P2O5 K2O S Mg

Corn 200 114 265 33 65

Cotton 1200 58 168 29 25

Soybeans 60 58 199 19 24

Wheat 80 54 162 20 24

Don’t Guess – Soil Test! Don’t Guess – Soil Test!