rate: 1.3 lbs. / bu. of yield goal timing 1/3 or less @ planting 2/3 or more @ sidedress...
TRANSCRIPT
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!