Fertility & Curing Studies Studies were designed to evaluate the effects of nitrogen (N) rate, N source and curing on TSNA formation in burley tobacco.

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Presentation transcript:

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 N source = 28% UAN

Influence of Nitrogen Rate on Ammonium & Nitrate Soil Levels After Harvest N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units

Influence of Nitrogen Rate on Burley Yield – UK Woodford Co. Farm N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units

Influence of Nitrogen Rate on TSNA Formation N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units Broadcast N

Influence of Ventilation During Curing on Burley Yield – UK Woodford Co. Farm

N source = 28% UAN Broadcast units +Ammonium Nitrate Sidedressed units

Effect of Broadcast & Sidedress Nitrogen Source on Burley Yield Fayette County – Robert Eads Farm 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 Broadcast (150 units/ acre) Sidedress (100 Units/ acre) AN = Ammonium Nitrate, CN = Calcium Nitrate