Abstract
To clarify the effects of fertilization on fruit quality and vine growth, liquid fertilizer (LF) was applied from bud break until four stages, i.e., full bloom (FB), 20 days after full bloom (20DAFB), veraison (VE), and harvest (HA), to three year-old potted ‘Aki Queen’ grapevines (Vitis labruscana Bailey). In control vines, water was applied throughout the treatment period. The improvement of fruit quality by girdling under LF treatment was also evaluated. At the end of each treatment, LF was removed by pouring a larege volume of water. As a result, in grapevines subjected to long LF treatments of 20DAFB, VE, and HA, berry skin anthocyanin content and total soluble solids (TSS) were decreased. In short LF treatment of FB and control vines, bunch and berry weight were decreased. Skin anthocyanin content and TSS were increased by girdling; however, they were low in grapevines subjected to long LF treatments such as 20 DAFB, VE, and HA. As regards the diagnosis of vine and soil nutrient conditions, soil nutrient level was presumed to be high and anthocyanin content and TSS were presumed to decrease in the following two cases of vine growth: (1) color of the 8th node leaf exceeded the green meter value (SPAD-502) of 46 after 20DAFB, or (2) lateral shoot elongated after 20DAFB. However, to determine growth of lateral shoot, other factors affecting shoot growth (e.g., water-deficit stress, root volume, and reserve nutrient) should be taken into account.
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Claims 6
Claim · model-written summary
Long liquid fertilizer treatments decreased berry skin anthocyanin and soluble solids.
- Treatment
- long LF treatments of 20DAFB, VE, and HAe0
- Outcome
- berry skin anthocyanin content and total soluble solids (TSS)e0
- Direction
- decreasede0
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in grapevines subjected to long LF treatments of 20DAFB, VE, and HA, berry skin anthocyanin content and total soluble solids (TSS) were decreased”
Claim · model-written summary
Short liquid fertilizer treatment and control vines had decreased bunch and berry weight.
Verbatim
e0“In short LF treatment of FB and control vines, bunch and berry weight were decreased”
t0“Grape”
Claim · model-written summary
Girdling increased skin anthocyanin and soluble solids.
Not reportedComparator
Verbatim
e0“Skin anthocyanin content and TSS were increased by girdling”
t0“Grape”
Claim · model-written summary
Anthocyanin and soluble solids remained low under long fertilizer treatments despite girdling.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“however, they were low in grapevines subjected to long LF treatments such as 20 DAFB, VE, and HA”
Claim · model-written summary
Leaf greenness above 46 after 20DAFB indicated high soil nutrients and lower anthocyanin and soluble solids.
Verbatim
e0“color of the 8th node leaf exceeded the green meter value (SPAD-502) of 46 after 20DAFB”
t0“Grape”
Claim · model-written summary
Lateral shoot elongation after 20DAFB indicated high soil nutrients and reduced berry quality.
Verbatim
e0“lateral shoot elongated after 20DAFB”
t0“Grape”
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