Abstract
Abstract Nicotiana tabacum L., cv. ‘Ky‐14’, was grown in field experiments on Maury silt loam soil (clayey, mixed, mesic; Typic, paleudult) to determine the influence of Mo and N nutrition on growth, yield, and Mo concentration of burley tobacco. Previous studies have shown that high rates of commercial fertilizers commonly applied in hurley tobacco production decreased soil pH, concentration of soil and plant Mo, and depressed dry matter accumulation during early growth stages. The present studies were designed to evaluate the use of Mo and NO ‐ 3 sources of N fertilizer to increase early growth and final cured leaf yields. In one experiment conducted during 2 years, N as KNO 3 , NH 4 NO 3 , or urea was applied at rates of O, 224, and 448 kg N/ha. Potassium in the form of K 2 SO 4 , and in amounts equivalent to the K in KNO 3 was added to plots receiving NH 4 NO 3 and urea. In a second experiment conducted during 1 year N as Ca(NO 3 ) 2 or urea was applied at rates of 280 kg N/ha. No K 2 S0 4 was applied. Rates of Mo as sodium molybdate were O, 0.22, and 0.44 kg Mo/ha in Experiment 1 and O, 0.22, 0.44, and 0.88 kg Mo/ha in Experiment 2. In Experiment 1, dry matter accumulation during early growth was inversely related to rate of N and K fertilizer applied. Mo fertilization did not overcome the depressing effects of fertilizer on early growth, but a trend existed for both Mo and NO 3 ‐ sources of N to improve early growth. Mo significantly increased yields of cured leaf. Significant N rate × Mo rate and N and K fertilizer treatment × Mo rate interactions occurred for cured leaf yields. Response to Mo occurred only at the 224 kg N rate, and Mo applied at the rate of 0.44 kg/ha increased yields about 900 kg/ha over plots unfertilized with Mo in the presence of KNO 3 . Average plant Mo concentration during early growth was doubled by adding Mo at the 0.44 kg/ha rate and halved by adding N at the 448 kg/ha rate. The critical concentration of Mo for dry matter accumulation during early growth appeared to be about 0.38 μ/g dry weight. Results of Experiment 2 confirmed those of Experiment 1 regarding effects of NO 3 ‐ sources and Mo fertilization. Additionally, Mn concentration in plants treated with Ca(NO 3 ) 2 was about half that of urea‐treated plants, and in urea‐treated plants Mn concentration was reduced by one‐half by Mo fertilization. Since Mn toxicity of tobacco is common in hurley production, these findings are of particular significance.
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Claims 14
Claim · model-written summary
Early dry matter accumulation was inversely related to N and K fertilizer rate.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Treatment
- N and K fertilizere0
- Outcome
- dry matter accumulation during early growthe0
- Direction
- inversely relatede0
- Qualifier
- Experiment 1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Experiment 1, dry matter accumulation during early growth was inversely related to rate of N and K fertilizer applied.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Mo fertilization did not overcome fertilizer suppression of early growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Mo fertilizatione0
- Outcome
- early growthe0
- Direction
- did not overcomee0
- Comparator
- fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mo fertilization did not overcome the depressing effects of fertilizer on early growth”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Mo showed a trend toward improving early growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Moe0
- Outcome
- early growthe0
- Direction
- improvee0
- Qualifier
- a trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a trend existed for both Mo and NO 3 ‐ sources of N to improve early growth.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
NO 3 ‐ N sources showed a trend toward improving early growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- NO 3 ‐ sources of Ne0
- Outcome
- early growthe0
- Direction
- improvee0
- Qualifier
- a trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a trend existed for both Mo and NO 3 ‐ sources of N to improve early growth.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Mo significantly increased cured leaf yields.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Moe0
- Outcome
- yields of cured leafe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mo significantly increased yields of cured leaf.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
N rate and Mo rate interacted significantly for cured leaf yield.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- N rate × Mo ratee0
- Outcome
- cured leaf yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant N rate × Mo rate and N and K fertilizer treatment × Mo rate interactions occurred for cured leaf yields.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
N and K fertilizer treatment and Mo rate interacted significantly for cured leaf yield.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- N and K fertilizer treatment × Mo ratee0
- Outcome
- cured leaf yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant N rate × Mo rate and N and K fertilizer treatment × Mo rate interactions occurred for cured leaf yields.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Response to Mo occurred only at the 224 kg N rate.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- Response to Moe0
- Qualifier
- 224 kg N ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Response to Mo occurred only at the 224 kg N rate”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Mo at 0.44 kg/ha increased cured leaf yield about 900 kg/ha over no Mo with KNO 3.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Mo applied at the rate of 0.44 kg/hae0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 900 kg/hae0
- Qualifier
- presence of KNO 3e0
- Comparator
- plots unfertilized with Moe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mo applied at the rate of 0.44 kg/ha increased yields about 900 kg/ha over plots unfertilized with Mo in the presence of KNO 3”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Mo at 0.44 kg/ha doubled average plant Mo concentration during early growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Mo at the 0.44 kg/ha ratee0
- Outcome
- plant Mo concentration during early growthe0
- Direction
- doublede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average plant Mo concentration during early growth was doubled by adding Mo at the 0.44 kg/ha rate”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
N at 448 kg/ha halved average plant Mo concentration during early growth.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- N at the 448 kg/ha ratee0
- Outcome
- Mo Compositiont0
- Direction
- halvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“halved by adding N at the 448 kg/ha rate.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
The critical Mo concentration for early dry matter accumulation appeared to be about 0.38 μ/g dry weight.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- critical concentration of Mo for dry matter accumulation during early growthe0
- Value
- 0.38 μ/g dry weighte0
- Qualifier
- appearede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical concentration of Mo for dry matter accumulation during early growth appeared to be about 0.38 μ/g dry weight.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Plant Mn concentration with Ca(NO 3 ) 2 was about half that with urea.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Ca(NO 3 ) 2e0
- Outcome
- Mn concentratione0
- Direction
- halfe0
- Comparator
- urea‐treated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn concentration in plants treated with Ca(NO 3 ) 2 was about half that of urea‐treated plants”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
Claim · model-written summary
Mo fertilization halved plant Mn concentration in urea-treated plants.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Mo fertilizatione0
- Outcome
- Mn concentratione0
- Direction
- reducede0
- Value
- one‐halfe0
- Qualifier
- urea‐treated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in urea‐treated plants Mn concentration was reduced by one‐half by Mo fertilization.”
t0“Mo and N Effects on Growth, Yield, and Mo Composition of Burley Tobacco1”
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