Fertility & Curing Studies
9
Fertility & Curing Studies Studies were designed to evaluate the effects of nitrogen (N) rate, N source and curing on TSNA formation in burley tobacco. The combined N rate and curing study was conducted at the UK Woodford Co. Farm (ARC) and the N source study was conducted at Robert Eads Farm in Eastern Fayette Co. Evaluation of the effects of N rates on soil nitrates and ammonium levels revealed a linear pattern both before sidedressing and after harvest. Yields were non-responsive to N rates. However, the highest initial rate produced the lowest yield. TSNA including NNN, NAT & Total TSNAs increased with increasing N rate. Sidedressing did not significantly increase TSNA levels. N source at broadcast and sidedressing did not effect TSNA levels.
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Fertility & Curing Studies
Studies were designed to evaluate the effects of nitrogen (N) rate, N source and curing on TSNA formation in burley tobacco. The combined N rate and curing study was conducted at the UK Woodford Co. Farm (ARC) and the N source study was conducted at Robert Eads Farm in Eastern Fayette Co. Evaluation of the effects of N rates on soil nitrates and ammonium levels revealed a linear pattern both before sidedressing and after harvest. Yields were non-responsive to N rates. However, the highest initial rate produced the lowest yield. TSNA including NNN, NAT & Total TSNAs increased with increasing N rate. Sidedressing did not significantly increase TSNA levels. N source at broadcast and sidedressing did not effect TSNA levels.
Influence of Broadcast Nitrogen on Ammonium & Nitrate Soil Levels Prior to
Sidedressing
44.7
16.03.4
258.2
188.4
100.0
0
50
100
150
200
250
300
100 200 300Broadcast N
ppm NH4
NH3
N source = 28% UAN
Influence of Nitrogen Rate on Ammonium& Nitrate Soil Levels After Harvest
4.32 3.92
40.34
64.74
1.812.521.79
28.62
14.67
9.58
0
10
20
30
40
50
60
70
80
100+0 100+100 200+0 200+100 300+0Broadcast N
ppm NH4
NH3
N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units
Influence of Nitrogen Rate on Burley Yield – UK Woodford Co. Farm
585 495
726 681
787 753 762 804685
687 717 727 782716
557525506 109
700793916 123
107
97
33725772897274627882896
0
500
1000
1500
2000
2500
3000
100 + 0 100 + 100 200 + 0 200 + 100 300 + 0 LSD
Broadcast N
Yie
ld l
b/A Total
Tips
Leaf
Lugs
Flyings
N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units
Influence of Nitrogen Rate on TSNA Formation
0
1
2
3
4
5
ppm
NNN NAT Total TSNA
NNN 0.94 1.28 1.85 2.76 2.40 1.13
NAT 0.66 0.74 1.21 1.46 1.35 0.59
Total TSNA 1.67 2.09 3.22 4.33 3.95 1.62
100+0 100+100 200+0 200+100 300+0 LSD
N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units
Broadcast N
Influence of Ventilation During Curing on Burley Yield – UK Woodford Co. Farm
758759
771681
75508559
141681845
60
96
12926282933
0
500
1000
1500
2000
2500
3000
Non-Vent Ventilated LSD
Curing
Yie
ld lb
/A
Flyings Lugs Leaf Tips Total
Influence of Ventilation During Curing on Burley Yield – UK Woodford Co. Farm
0
1
2
3
4
5
Broadcast N
ppmNNN
NAT
TSNA
NNN 2.01 1.68 0.85
NAT 1.03 1.14 0.86
TSNA 3.15 2.96 1.92
Non-Vent Ventilated LSD 0.05
N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units
Effect of Broadcast & Sidedress Nitrogen Source on Burley Yield
Fayette County – Robert Eads Farm
814 742 736 754 804 734
1584 1684 1563 1560 1576 1695
862 909804 821 850 905
333432303135310333353261
0
500
1000
1500
2000
2500
3000
3500
LiquidUAN28%
Urea AN CN AN 27 AN 34
LB
/A
Total
Leaf
Lugs
Flyings
Broadcast (150 units/ acre) Sidedress (100 Units/ acre)AN = Ammonium Nitrate, CN = Calcium Nitrate
Effect of Broadcast & Sidedress Nitrogen Source on Burley TSNA Formation – Robert Eads Farm
0
0.2
0.4
0.6
0.8
1
pp
m
NNN NAT TSNA
NNN 0.4342 0.4969 0.45 0.5542 0.4592 0.3678
NAT 0.2867 0.3261 0.29 0.3125 0.2908 0.2994
TSNA 0.74 0.84 0.76 0.88 0.78 0.68
Liquid Urea AN CN AN 27 AN 34
Broadcast (150 units/ acre) Sidedress (100 Units/ acre)AN = Ammonium Nitrate, CN = Calcium Nitrate
