บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Fruit and shoot development in apple as affected by temperature, light, humidity and a possible greenhouse effect in simulated latitudes.

Redalen, G.; Lindhagen, M.; Huntrieser, I.;

Acta Horticulturae Year: 1993 Issue: No. 326 Pages: 65-71 Ref: 13 ref.

1993

บทคัดย่อ

Fruit and shoot development in apple as affected by temperature, light, humidity and a possible greenhouse effect in simulated latitudes.

Container-grown 3-year-old trees of apple cultivars Katy (6 trees) and Discovery (9 trees) were placed in climate chambers in the Biotron, Alnarp, from just after petal fall until late autumn 1991. Three climates were simulated: (a) Stockholm climate (at about 60 deg N.); (b) Modified Stockholm climate with a temperature 2 deg C higher than normal (a possible greenhouse effect); and (c) Frankfurt climate (at about 50 deg N.) Total shoot growth was slightly higher in trees from treatment (b). Fruits were harvested according to ground colour development and ease of fruit abscission. Discovery had very low fruit set in all treatments due to poor conditions during flowering. Katy also had low fruit set, but sufficient to allow an evaluation of fruit properties. Vitamin C contents and titratable acidity were highest in fruits from treatment (a) and lowest in fruits from treatment (c). Soluble solids content was also lowest in fruits from treatment (c). Towards the end of the growing season the health status of the trees in treatment (c) was poorer than in the other treatments due to the presence of spider mites. No such differences could be found between treatments (a) and (b). Although not statistically significant, there was a tendency towards a higher number of flowers/tree the year after the climate chamber treatments on the trees from treatment (b).