fertility trials increasing rates of nitrogen fertilizer beyond 150 lb/a can lower soil ph but does...
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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
Fayette Co. – John Mahan Farm
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
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 Blue Mold
Fayette Co. – John Mahan Farm
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
Fayette Co. – John Mahan Farm
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
Fayette Co. – John Mahan Farm
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
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
Effects of Nitrogen Rate on Soil pH
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
All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate.
Variety = 14xL8
Effects of Nitrogen Rate on Early Season Burley Vigor
Jackson Co. – Jerry Neeley Farm
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
Effects of Nitrogen Rate on Burley Yield
Jackson Co. – Jerry Neeley Farm
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
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
Variety = 14xL8
Effects of Nitrogen Rate on Burley Cured Leaf Chemistry
Jackson Co. – Jerry Neeley Farm
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)
NNN Total TSNA Nitrite Nitrate
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
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
Effects of Nitrogen Rate on Burley Cured Leaf Chemistry
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)
NNN Total TSNA Nitrite Nitrate
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
Variety = NC 5
Effects of Nitrogen Rate on Soil pH
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
All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate.
Variety = 14xL8
Effects of Nitrogen Rate on Early Season Burley Vigor
Madison Co. – Gregg Harris Farm
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
%
All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate.
Variety = 14xL8
Effects of Nitrogen Rate on Burley Yield
Madison Co. – Gregg Harris Farm
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
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
Variety = 14xL8
Effects of Nitrogen Rate on Burley Cured Leaf Chemistry
Madison Co. – Gregg Harris Farm
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)
NNN Total TSNA Nitrite Nitrate
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
Variety = 14xL8
Effects of Nitrogen Rate on Soil pH
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
All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate.
Variety = KT200
Effects of Nitrogen Rate on Early Season Burley Vigor
Shelby Co. – Ray Tucker, Jr. Farm
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
%
All plots received 450 lb/a Ammonium Nitrate Broadcast followed by the remainder of the nitrogen shortly after transplanting. AN = Ammonium Nitrate.
Variety = KT200
Effects of Nitrogen Rate on Burley Yield
Shelby Co. – Ray Tucker, Jr. Farm
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
Effects of Nitrogen Rate on Burley Cured Leaf Chemistry
Shelby Co. – Ray Tucker, Jr. Farm
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)
NNN Total TSNA Nitrite Nitrate
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
Variety = KT200
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