Abstract
A field experiment was conducted in Chenzhou of Hunan.The humic acid and its mixed application with ferric sulfate were fertilized into alkaline tobacco field.The soil pH,soil fertility and tobacco agronomic characters were determined to study the regulative effects of humic acid with ferric sulfate on the tobacco soil.The results were as follow:(1)Humic acid and its mixed application with ferric sulfate both decreased the pH of tobacco soil.Compared with untreated soil,the soil pH of two treatments were decreased by 0.06 and 0.21,respectively.The effect of compound addition was better than single adding humic acid.(2)Humic acid and its mixed application with ferric sulfate improved the soil fertility.Compared with control,the content of alkali-hydrolyzable nitrogen was increased by 9.0% by application humic acid,and the contents of organic matter,alkali-hydrolyzable nitrogen and available iron were increased by 19.6%,10.5% and 41.7%,respectively by combined application of humic acid and ferric sulfate.Fe content of tobacco leaves reached a significant level,and it was increased by 13.0% by combined application of humic acid and ferric sulfate compared with control.(3)After fertilized humic acid and ferric sulfate,there was no obvious impact on agronomic characters of tobacco,which indicated that they had no significant effect on tobacco growth.
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Claims 9
Claim · model-written summary
Humic acid lowered tobacco soil pH by 0.06 relative to untreated soil.
- Treatment
- Humic acide0
- Outcome
- pH of tobacco soile0
- Direction
- decreasede0
- Value
- 0.06e0
- Comparator
- untreated soile0
Not reportedTaxon
Verbatim
e0“Humic acid and its mixed application with ferric sulfate both decreased the pH of tobacco soil.Compared with untreated soil,the soil pH of two treatments were decreased by 0.06 and 0.21,respectively.”
Claim · model-written summary
Combined humic acid and ferric sulfate lowered tobacco soil pH by 0.21.
- Treatment
- mixed application with ferric sulfatee0
- Outcome
- pH of tobacco soile0
- Direction
- decreasede0
- Value
- 0.21e0
- Comparator
- untreated soile0
Not reportedTaxon
Verbatim
e0“Humic acid and its mixed application with ferric sulfate both decreased the pH of tobacco soil.Compared with untreated soil,the soil pH of two treatments were decreased by 0.06 and 0.21,respectively.”
Claim · model-written summary
Combined amendment was better than humic acid alone for pH reduction.
Not reportedTaxon
Verbatim
e0“The effect of compound addition was better than single adding humic acid.”
t0“tobacco”
Claim · model-written summary
Humic acid raised soil alkali-hydrolyzable nitrogen by 9.0%.
- Treatment
- humic acide0
- Outcome
- content of alkali-hydrolyzable nitrogene0
- Direction
- increasede0
- Value
- 9.0%e0
- Comparator
- controle0
Not reportedTaxon
Verbatim
e0“Compared with control,the content of alkali-hydrolyzable nitrogen was increased by 9.0% by application humic acid”
Claim · model-written summary
Combined application increased soil organic matter by 19.6%.
- Treatment
- combined application of humic acid and ferric sulfatee0
- Outcome
- organic mattere0
- Direction
- increasede0
- Value
- 19.6%e0
Not reportedTaxonComparator
Verbatim
e0“the contents of organic matter,alkali-hydrolyzable nitrogen and available iron were increased by 19.6%,10.5% and 41.7%,respectively by combined application of humic acid and ferric sulfate”
Claim · model-written summary
Combined application increased soil alkali-hydrolyzable nitrogen by 10.5%.
- Treatment
- combined application of humic acid and ferric sulfatee0
- Outcome
- alkali-hydrolyzable nitrogene0
- Direction
- increasede0
- Value
- 10.5%e0
Not reportedTaxonComparator
Verbatim
e0“the contents of organic matter,alkali-hydrolyzable nitrogen and available iron were increased by 19.6%,10.5% and 41.7%,respectively by combined application of humic acid and ferric sulfate”
Claim · model-written summary
Combined application increased soil available iron by 41.7%.
- Treatment
- combined application of humic acid and ferric sulfatee0
- Outcome
- available irone0
- Direction
- increasede0
- Value
- 41.7%e0
Not reportedTaxonComparator
Verbatim
e0“the contents of organic matter,alkali-hydrolyzable nitrogen and available iron were increased by 19.6%,10.5% and 41.7%,respectively by combined application of humic acid and ferric sulfate”
Claim · model-written summary
Combined application increased tobacco leaf Fe by 13.0% significantly.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- combined application of humic acid and ferric sulfatee0
- Outcome
- Fe content of tobacco leavese0
- Direction
- increasede0
- Value
- 13.0%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fe content of tobacco leaves reached a significant level,and it was increased by 13.0% by combined application of humic acid and ferric sulfate compared with control.”
Claim · model-written summary
Humic acid and ferric sulfate had no significant effect on tobacco growth traits.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- humic acid and ferric sulfatee0
- Outcome
- agronomic characters of tobaccoe0
- Direction
- no obvious impacte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After fertilized humic acid and ferric sulfate,there was no obvious impact on agronomic characters of tobacco,which indicated that they had no significant effect on tobacco growth.”
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