Abstract
Aims: The responses in growth, yield and quality components of a Vitis vinifera cultivar (Italia) to the foliar applications of two humic acids extracted from a soil and a compost have been studied. Methods and results: The foliar applications of the two humic acids were performed in two years and six different dates of the season. Both humic acids were tested at two different concentrations, 5 and 20 mg/L. Throughout the trial, different analyses were performed (SPAD, chlorophyll content, titrable acidity, soluble sugars, pH, yield). Grapevines treated with the two humic acids exhibited both significant increases in total chlorophyll content and reductions of the chlorophyll a/b ratio. Application of humic acids significantly decreased titrable acidity and increased °Brix/acidity ratio. Generally, the treatments with humic acids significantly increased berry size, and as a consequence the yield. Conclusions: Humic acids exerted some positive effects (chlorophyll content, acidity, berry size) in Italia table grape. Better results were obtained when the compost humic acid was sprayed. Significance and impact of study: This study gives new information about the positive effects of foliar application of humic acids, active components of soil and compost organic matter, on yield and fruit quality of table grape. In organic viticulture humic acids may find a valid and appropriate application for a technical and economical use.
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Claims 8
Claim · model-written summary
Humic acid treatments significantly increased grape total chlorophyll.
- Taxon
- table grapet0
- Treatment
- foliar applications of humic acidst1
- Outcome
- total chlorophyll contente0
- Direction
- increasese0
Not reportedComparator
Verbatim
e0“significant increases in total chlorophyll content”
t0“table grape”
t1“foliar applications of humic acids”
Claim · model-written summary
Humic acids reduced grape chlorophyll a/b ratio.
- Taxon
- table grapet0
- Treatment
- foliar applications of humic acidst1
- Outcome
- chlorophyll a/b ratioe0
- Direction
- reductionse0
Not reportedComparator
Verbatim
e0“reductions of the chlorophyll a/b ratio”
t0“table grape”
t1“foliar applications of humic acids”
Claim · model-written summary
Humic acid application significantly reduced titrable acidity.
- Taxon
- table grapet0
- Treatment
- Application of humic acidse0
- Outcome
- titrable aciditye0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Application of humic acids significantly decreased titrable acidity”
t0“table grape”
Claim · model-written summary
Humic acid application increased the °Brix/acidity ratio.
- Taxon
- table grapet0
- Treatment
- foliar applications of humic acidst1
- Outcome
- °Brix/acidity ratioe0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“increased °Brix/acidity ratio”
t0“table grape”
t1“foliar applications of humic acids”
Claim · model-written summary
Humic acid treatments increased berry size.
- Taxon
- table grapet0
- Treatment
- foliar applications of humic acidst1
- Outcome
- berry sizee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“increased berry size”
t0“table grape”
t1“foliar applications of humic acids”
Claim · model-written summary
Humic acids increased yield as a consequence of increased berry size.
Verbatim
e0“increased berry size, and as a consequence the yield”
t0“table grape”
t1“foliar applications of humic acids”
Claim · model-written summary
Spraying compost humic acid gave better results.
Not reportedComparator
Verbatim
e0“Better results were obtained when the compost humic acid was sprayed.”
t0“table grape”
Claim · model-written summary
The authors suggest humic acids can be appropriately used in organic viticulture.
Verbatim
e0“In organic viticulture humic acids may find a valid and appropriate application for a technical and economical use.”
t0“table grape”
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