Fertilizing Tobacco to Meet

Today’s Needs

Cover Crops

A Disk or a Compaction Tool?

Compaction Created with a Disk

Soil Penetration Resistance

Eden Shale Farm 1985

200210220230240250260270280290

2 4 6 8 10 12

lbs/

sq in

ch

Compaction Noncompaction

No Deep Roots for Dry Periods

Fertilization

A Good Burley Crop 3000 lb/aRemoves

200 lbs of N200 lbs of N

35 lbs of P2O5

240 lbs of K20

N Deficiency or Drought?

Irrigation Started Late

Recommended N Rates

Soil Level of N Lbs. N/ac

High 150-200

Medium 200-250

Low 250-300

Effects of Nitrogen Rates on Burley Tobacco at Spindletop Farm

2000

2500

3000

3500

4000

0 50 100 150 200 250 300 350 400

N rate (lb/a)

Yie

ld lb

/a

1991

1992

Equivalent Acidity or Basicity of Fertilizers

-140 -90 -40 10

Ammonium Sulfate

Urea

Ammonium Nitrate

Potassium Nitrate

Soda-Potash

Sodium Nitrate

lbs of Calcium Carbonate per 100 lbs product

Nitrogen Sources as a Sidedressing on Burley Tobacco

Laurel Co. - Dean Cornett Farm

590 621 591 557

1473 1425 1399 1492

806 667541

783

2869 2713 2531 2832

0

500

1000

1500

2000

2500

3000

450AN+(625SN) 450AN+(300AN) 750AN 2000{5-10-15} +(300AN+300AN)

Yie

ld l

b/a

BROADCAST + (SIDEDRESS) LSD 0.05 = 92 429 420 808

Cost & Returns From DifferentSources of NitrogenLaurel Co. - Dean Cornett Farm

0500

10001500200025003000350040004500500055006000$

FERT. COST 159.68 84.38 84.38 246.5

RETURNS - FERT. COST 5348.8 5124.58 4775.14 5190.94

450AN+(625SN) 450AN+(300AN) 750AN2000{5-10-15}

+(300AN+300AN)

Effects of Nitrogen Application on Soil pH

5

5.2

5.4

5.6

5.8

6

6.2

6.4

1-M

ay

8-M

ay

15

-Ma

y

22

-Ma

y

29

-Ma

y

5-J

un

12

-Ju

n

19

-Ju

n

26

-Ju

n

3-J

ul

10

-Ju

l

17

-Ju

l

24

-Ju

l

31

-Ju

l

7-A

ug

14

-Au

g

21

-Au

g

Soil pH0 N 240 lbs N

All plots received 150 lbs P2O5 and 250 lbs K20

Effect of Liming an Acid Soil Prior to Use of Urea and Sodium Nitrate Sources of Nitrogen

2612

2765 2772

2358

26472750

2000

2200

2400

2600

2800

3000

0 5 7.5

Tons of Lime/A

Yie

ld l

b/a

Sodium Nitrate Urea

Both N sources applied at 225 lb N/A pre-plant.

Effect of Liming an Acid Soil Prior to Use of Urea and Sodium Nitrate Sources of Nitrogen

5.3

5.8

6.3

4.7

5.76

4

4.5

5

5.5

6

6.5

7

0 5 7.5

Tons of Lime/A

So

il p

H

Sodium Nitrate Urea

Both N sources applied at 225 lb N/A pre-plant. Soil pH (water) measured at midseason of each year. Soil pH before liming was 5.4.

Manganese Toxicity

Agricultural Lime

Rank Green Tobacco at Harvest

Fat Stem Cause Poor Curing

Foliar Feeding TrialCLAY CO. - BOBBY REID FARM

394 657 629 663 639 570 500 506 580

1149

1384 1498 1350 1213 1312 1256 1383 1204

700

995 956861

784 859784

850748

3036 3083 2874 2636 2741 2540 2739 25322243

0

500

1000

1500

2000

2500

3000

3500

100 CK 100 NL 100 GG 200 CK 200 NL 200 GG 300 CK 300 NL 300 GG

Yie

ld lb

/a

CK=CHECK, NL=NUTRA LEAF, GG=GRO-GREEN FOLIAR FERTILIZER APPLIED 2 LB ACTUAL N/ ACRE AT 4 AND 10 WEEKS LSD 0.05 = 144 276 171 395

Phosphorus Deficiency

Potassium Deficiency

Potassium-Nitrogen Interactions

1400

1500

1600

1700

1800

1900

2000

2100

2200

100 250 400

N applied (lb/a)

Yield lb/a0 K 100 K

Evanylo & Sims (1987)

Boron Deficiency

Calcium Deficiency

Tobacco Information Online

www.uky.edu/Ag/Tobacco/

www.uky.edu/Ag/TobaccoProd/