Articles
WHOLE PLANT EXCAVATIONS TO DETERMINE NUTRITIONAL REQUIREMENTS IN ‘HORT16A’ KIWIFRUIT VINES
Article number
868_19
Pages
171 – 176
Language
English
Abstract
The timing and magnitude of biomass and nutrient accumulation in mature, field-grown Hort16A kiwifruit vines was determined by excavating entire vines at three-weekly intervals for an entire season.
The vines were planted in the mid 1980s and the Hort16A was grafted onto the Hayward rootstock in 1997. Results were compared with a similar study carried out on 6-year-old Hayward vines in the late 1980s.
The total biomass of the Hort16A vines was larger than that of the Hayward vines.
The total biomass of the perennial components in the Hort16A and Hayward vines was 48.2 (± 2.2) and 29.5 (± 1.0) kg DW vine respectively.
The total biomass of the new seasons growth was 42 kg DW in the Hort16A vines with an additional 2.7 kg removed in summer prunings during the season.
Fruit comprised 22 kg (49%) of the new seasons growth in the Hort16A vines.
In comparison, the total new seasons growth was 30 kg DW vine in the Hayward vines, of which fruit comprised 14 kg or 47%. Nitrogen uptake occurred in both cultivars before budburst and nitrogen, and phosphorus reserves from perennial components were utilised during the summer.
The reserves were largely replenished by the time of fruit harvest.
The vines were planted in the mid 1980s and the Hort16A was grafted onto the Hayward rootstock in 1997. Results were compared with a similar study carried out on 6-year-old Hayward vines in the late 1980s.
The total biomass of the Hort16A vines was larger than that of the Hayward vines.
The total biomass of the perennial components in the Hort16A and Hayward vines was 48.2 (± 2.2) and 29.5 (± 1.0) kg DW vine respectively.
The total biomass of the new seasons growth was 42 kg DW in the Hort16A vines with an additional 2.7 kg removed in summer prunings during the season.
Fruit comprised 22 kg (49%) of the new seasons growth in the Hort16A vines.
In comparison, the total new seasons growth was 30 kg DW vine in the Hayward vines, of which fruit comprised 14 kg or 47%. Nitrogen uptake occurred in both cultivars before budburst and nitrogen, and phosphorus reserves from perennial components were utilised during the summer.
The reserves were largely replenished by the time of fruit harvest.
Authors
L. Boyd, A. Barnett, C. Civolani, E. Fini
Keywords
Actinidia deliciosa, Actinidia chinensis, mineral nutrition, whole-plant harvesting
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