ISHS Acta Horticulturae 379: International Symposium on Quality of Fruit and Vegetables: Influence of Pre- and Post- Harvest Factors and Technology
QUALITY EVALUATION OF ACTINIDIA DELICIOSA FRUITS UNDER DIFFERENT CULTURAL CONDITIONS |
| Authors: | M.L. Miaja, R. Botta, G. Me, A. Luzzati |
| Keywords: | kiwifruit, fertilization, leaf, fruit analysis, sugars, acids |
| Abstract:
From 1990 to 1992 the influence of different types of fertilization, pruning and spacing on fruit quality was investigated in Actinidia deliciosa, cv Hayward. The research was carried out in Centallo (Cuneo, Italy) in two parcels (A and B); parcel A spacing was 4.5x2.5 m and it was fertilized with 350 Kg/ha K2SO4 per year; 300 Kg/ha superphosphate every second year and with chopped pruning residue and mowed grass. Parcel B spacing was 4x4 m and it was fertilized with 350 Kg/ha urea, 300 Kg/ha K2SO4 per year, 160 Kg/ha superphosphate every second year, and with chopped pruning residue and mowed grass. Soil and leaves were analyzed 3 and 2 times per year, respectively; fruits were analyzed at different picking times and at consumption maturity. The soil of both orchards was loam and had sub-acid to neutral pH. No nutritional lack was found in leaf and soil analyses in the considered period indicating that both kinds of fertilization were adequate. Yield was higher in parcel A where vine density was higher, while fruit sugar content was lower than that in parcel B. Main sugars were glucose and fructose (4.5–5.0 g/l of juice each), followed by sucrose (1–2 g/l). Ascorbic acid ranged from 80 to 95 mg/100 ml of juice. | |
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