Effects of fertilization on apple tree development, yield and fruit quality.
Scudellari, D.; Marangoni, B.; Cobianchi, D.; Faedi, W.; Maltoni, M. L.;
Optimization of plant nutrition: refereed papers from the Eighth International Colloquium for the Optimization of Plant Nutrition, 31 August-8 September 1992, Lisbon, Portugal. Year: 1993 Pages: 457-462 Ref: 22 ref.
1993
บทคัดย่อ
A 9-year trial was conducted in Ferrara Province to assess the effects of various combinations of N, P and K fertilizers on apple cultivars Hi Early and Heavy Stripe budded on rootstocks M.26 and MM.106. Four fertilizer regimes were applied yearly in Mar. as follows: N, P and K at 110, 26 and 125 kg/ha, respectively; N at 110 kg/ha (single or split application); and N and K at 110 and 125 kg/ha, respectively. In the split-N treatment, 70% of the N fertilizer was applied in Mar. and the rest postharvest. No differences in trunk and canopy size or in pruning wood weight were induced by the treatments in either cultivar. The NPK, NK and N (single application) treatments increased yield compared with unfertilized controls in Heavy Stripe but not Hi Early (in which there were no significant differences). The NK and NPK treatment increased average fruit weight in both cultivars. Tree vigour and yield on MM.106 rootstocks were greater than on M.26. The effects of fertilizers on fruit quality were moderate; the split-N application increased soluble solids contents compared with controls. The data suggest that the N and P rates used in this trial could be reduced in apple orchards.