Abstract
A field trial was carried out with flue-cured tobacco on a Shorrocks soil series at the Loskop research station. Different levels of K, Ca and Mg in the soil were obtained after two annual applications of these cations in the sulphate form. Averages for the three K levels in the top (300 mm) soil were 148,192 and 216 mg kg−1. The three Ca levels averaged 646,706 and 835 mg kg−1 and two Mg levels were 143 and 187 mg kg−1. The pH (water) varied between 5,3 and 5,4. The highest Ca level produced greener leaves with significantly more chlorophyll and higher nicotine levels when harvested. Both Ca and Mg increased leaf mass interactively. The higher Mg level adversely affected the texture of the cured leaf which was aggravated by the higher Ca levels. A single foliar application of boron (1 kg B ha−1) during the early flower bud stage increased the B content of the top leaves from 30,0 to 33,6 mg kg−1 and improved their texture. K applications did not significantly affect yield or quality, possibly due to a relatively high natural K content of the soil.
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Claims 7
Claim · model-written summary
The highest Ca level produced greener leaves with significantly more chlorophyll at harvest.
- Taxon
- flue-cured tobaccot0
- Treatment
- highest Ca levele1
- Outcome
- chlorophylle1
- Direction
- significantly moree1
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e1“The highest Ca level produced greener leaves with significantly more chlorophyll and higher nicotine levels when harvested”
Claim · model-written summary
The highest Ca level gave higher nicotine levels at harvest.
- Taxon
- flue-cured tobaccot0
- Treatment
- highest Ca levele1
- Outcome
- nicotine levelse1
- Direction
- highere1
- Qualifier
- when harvestede1
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e1“The highest Ca level produced greener leaves with significantly more chlorophyll and higher nicotine levels when harvested”
Claim · model-written summary
Both Ca and Mg increased leaf mass, interactively.
- Taxon
- flue-cured tobaccot0
- Treatment
- Ca and Mge2
- Outcome
- leaf masse2
- Direction
- increasede2
- Qualifier
- interactivelye2
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e2“Both Ca and Mg increased leaf mass interactively”
Claim · model-written summary
The higher Mg level adversely affected cured leaf texture, aggravated by the higher Ca levels.
- Taxon
- flue-cured tobaccot0
- Treatment
- higher Mg levele3
- Outcome
- texture of the cured leafe3
- Direction
- adversely affectede3
- Qualifier
- aggravated by the higher Ca levelse3
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e3“The higher Mg level adversely affected the texture of the cured leaf which was aggravated by the higher Ca levels”
Claim · model-written summary
A single foliar boron application at early flower bud stage increased B content of top leaves from 30.0 to 33.6 mg kg−1.
- Taxon
- flue-cured tobaccot0
- Organ / stage
- top leavese4
- Treatment
- foliar application of boron (1 kg B ha−1)e4
- Outcome
- B content of the top leavese4
- Direction
- increasede4
- Value
- 30,0 to 33,6 mg kg−1e4
- Qualifier
- during the early flower bud stagee4
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e4“A single foliar application of boron (1 kg B ha−1) during the early flower bud stage increased the B content of the top leaves from 30,0 to 33,6 mg kg−1 and improved their texture”
Claim · model-written summary
Foliar boron application improved the texture of the cured leaves.
- Taxon
- flue-cured tobaccot0
- Treatment
- foliar application of boron (1 kg B ha−1)e4
- Outcome
- texturee4
- Direction
- improvede4
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e4“A single foliar application of boron (1 kg B ha−1) during the early flower bud stage increased the B content of the top leaves from 30,0 to 33,6 mg kg−1 and improved their texture”
Claim · model-written summary
K applications did not significantly affect yield or quality.
- Taxon
- flue-cured tobaccot0
- Treatment
- K applicationse5
- Outcome
- yield or qualitye5
- Direction
- did not significantly affecte5
- Qualifier
- possibly due to a relatively high natural K content of the soile5
Not reportedComparator
Verbatim
t0“flue-cured tobacco (Nicotiana tabacum L.)”
e5“K applications did not significantly affect yield or quality, possibly due to a relatively high natural K content of the soil”
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