fertility trials increasing rates of nitrogen fertilizer beyond 150 lb/a can lower soil ph but does...

Fertility Trials

Increasing rates of nitrogen fertilizer beyond 150 lb/a can lower soil pH but does not necessary increase yield. Burley tobacco fertilized with 1200 lb/a of nitrogen yielded significantly better than 450 lb/a, but was not significantly better than other treatments. Tobacco fertilized with 450 lb/a ammonium nitrate plus 714 lb/a of 14-0-14 (calcium nitrate plus potassium nitrate) yielded very close to that of 1200 lb/a of ammonium nitrate, but with 150 lb/a less nitrogen.

Nitrogen rate increase did not correlate well with Total TSNA, NNN, nitrate and nitrite levels but slight increases were common.

Fertility Trials (continued)

Nitrogen fertilizer sources applied at 250 lb/a produced similar results. However, the treatment of 450 ammonium nitrate down with 645 lb/a of calcium nitrate produces higher yields than either treatment that received urea. Total TSNA, NNN, nitrate and nitrite levels were not influenced by nitrogen sources.

Effects of Nitrogen Rate on Burley Yield Across 4 Locations

359 356 345 352 330 371 367

1125 1170 1174 1145 1188 1193 1170

711 721 776 790 823 851 820

78

239

83

2882357241523412286229522472195

0

500

1000

1500

2000

2500

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

Yie

ld lb

/a

Flyings Lugs Tips

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate. 14-0-14 is a calcium/potassium nitrate mix.

Locations = Fayette, Jackson, Madison & Shelby Counties. Nitrogen at 1200 lb/a produced significantly more yield than 450 lb/a. There were no other significant differences.

Effects of Nitrogen Rate on Burley Cured Leaf Chemistry Across 4 Locations

0

5

10

15

20

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

pp

m

NNN Total TSNA Nitrite

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate. 14-0-14 is a calcium/potassium nitrate mix.

Nitrates could not be analyzed across locations due to treatment*location interactions

Effects of Nitrogen Rate on Soil pH

Fayette Co. – John Mahan Farm

5.9 5.8375 5.7375 5.6 5.625 5.63755.48750.24

0

1

2

3

4

5

6

7

8

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714

14-0-14

LSD

pH

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate.

Effects of Nitrogen Rate on Burley Vigor


32.5 36.25 31.25 35 33.75 37.5

8.26

66.25 66.25 6573.75 75

68.75 66.25

11.5736.25

0

20

40

60

80

100

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

%

Vigor Mid Season Vigor LateSeason


Effects of Nitrogen Rate on Blue Mold


2.251.5

2.5 2 2.5 21.1

1.752.25

1.75

2.75

1.75 1.75

2.75

1.212.75

0

2

4

6

8

10

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

Inci

den

ce

Blue Mold Mid Season Blue Mold Late Season

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate Scale is 0 best – 10 worst.

Effects of Nitrogen Rate on Burley Yield


273 295 276 319 286 299 280

1491 1460 14471619 1468 1510 1535

387 364 403365

355 370 359

78

239

83

2882174217921092302212621202150

0

500

1000

1500

2000

2500

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

Yie

ld l

b/a

Flyings Lugs Tips

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate. 14-0-14 is a calcium/potassium nitrate mix

Yields were affected by Blue Mold

Effects of Nitrogen Rate on Burley Cured Leaf Chemistry


0

2

4

6

8

10

12

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

pp

m (

Nit

rate

in

pp

t)

NNN Total TSNA Nitrite Nitrate



Jackson Co. – Jerry Neeley Farm

5.7375 5.825 5.75 5.955.4375

5.9255.4375 0.37

0

1

2

3

4

5

6

7

8

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714

14-0-14

LSD

pH


Variety = 14xL8

Effects of Nitrogen Rate on Early Season Burley Vigor


7060 63.75 66.25

48.7557.5

17.03

60

0

20

40

60

80

100

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

%

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate, MS=mid-season, LS=late season.

Variety = 14xL8



332 333 374 355 299 376 288

777 773908 890 953

996

685

319 325352 341 371

368

325

64

259

85

3681298174016231586163414311428

0

500

1000

1500

2000

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

Yie

ld l

b/a

Flyings Lugs Tips


Variety = 14xL8



0

2

4

6

8

10

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

pp

m (

Nit

rate

in

pp

t)



Variety = 14xL8

Effects of Nitrogen Source on Burley Yield

Lincoln Co. – Dan Cooper Farm

431 453 488 466 489 384 427

1118 1106 1117 10361221

1148 1163

551 548 570541

649519

634

80

181

102

2342224205123592042217421062101

0

500

1000

1500

2000

2500

556 U 333 U 300 AN

750 AN 450 AN 300 AN

450 AN 645 CN

450 AN 625 SN

450 AN 714 14-0-14

LSD

Yie

ld l

b/a

Flyings Lug Leaf

Number = lb/a, U = Urea, AN = Ammonium Nitrate, CN=Calcium Nitrate, SN = Sodium Nitrate14-0-14 is a calcium & potassium nitrate mix. Initial nitrogen was broadcast with addition sidedressed

Yields were affected by Blue Mold

Variety = NC 5


Lincoln Co. – Dan Cooper Farm

0

2

4

6

8

10

556 U 333 U 300 AN

750 AN 450 AN 300 AN

450 AN 645 CN

450 AN 625 SN

450 AN 714 14-0-14

pp

m (

Nit

rate

in

pp

t)



Variety = NC 5


Madison Co. – Gregg Harris Farm

6.975 6.7 6.75 6.9 6.85 6.956.675

0.23

0

1

2

3

4

5

6

7

8

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714

14-0-14

LSD

pH


Variety = 14xL8



56.25 53.75 53.75 48.75 51.25 57.5

12.65

47.5

0

20

40

60

80

100

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

%


Variety = 14xL8



545 517 453 461 461 466 564

1667 1669 1839 1516 1801 1772 1815

600 628 600719

666 693 639

187

238

171

3563019293129282695289328132810

0

500

1000

1500

2000

2500

3000

3500

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

Yie

ld l

b/a

Flyings Lugs Tips


Variety = 14xL8



0

2

4

6

8

10

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

pp

m (

Nit

rate

in

pp

t)



Variety = 14xL8


Shelby Co. – Ray Tucker, Jr. Farm

6.6625 6.23756.7625 6.4 6.55 6.5125

6.3

0.31

0

1

2

3

4

5

6

7

8

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714

14-0-14

LSD

pH


Variety = KT200



66.25 68.7561.25 66.25

75 75

12.37

71.25

0

20

40

60

80

100

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

LSD

%


Variety = KT200



288 280 275 271 273 337

565 777502 554 530 493 647

12251247

1420 1405 1544 15971567

314318 330 332 356 377 388

343

2939280927032562252926222391

0

500

1000

1500

2000

2500

3000

3500

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

Yie

ld lb

/a

All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate. LSD not available due to missing

Value. However, adding 714 lb/a 14-0-14 significantly improved yield over 450 lb/a alone

Variety = KT200



0

10

20

30

40

50

60

70

450 AN 600 AN 750 AN 900 AN 1050 AN 1200 AN 450 AN + 714 14-0-14

pp

m (

Nit

rate

in p

pt)



Variety = KT200

fertility trials increasing rates of nitrogen fertilizer beyond 150 lb/a can lower soil ph but does...

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