Naslov
Seasonal changes in the olive fruit and the effects of Summer-applied nitrogen and potassium

Autori
Loupassaki, M.H ; Perica, Slavko ; Androulakis, I.I.

Izvornik
Advances in horticultural science (0394-6169) 7 (1993), 2; 65-68

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
fruit development; fruit dry weight; oil content; summer fertilisation

Sažetak
The effect of summer soil and foliar-spray applications of two rates of both N and K on some characteristics of olive fruit and their seasonal changes were studied in a young, drip-irrigated olive (Olea europaea L., cv. Manzanillo) orchard in Chania, Crete. Initial fruit elongation in early summer was followed by a period when the transverse diameter increased rapidly, resulting in a decline of the longitudinal/transverse diameter ratio. Dry weights of whole fruit and flesh, water content, ash and most other characteristics measured increased continuously until early October. The relative rates of change for fruit fresh weight (mg/g/day) were high during the period from 7 July-14 August and 14 August-5 October, but they dropped to values close to zero in October-November. The increase of flesh oil per fruit in early summer paralleled the increase of flesh weight. Between August and September, however, oil accumulation in the fruit was enhanced. In October, a more or less stable maximum flesh and oil weight per fruit was recorded. Both N and K inputs had a significant negative effect on dry weight of flesh per fruit, which in November for N_treated and K-treated trees fell to 89% and 93%, respectively, in comparison to unfertilised controls. Foliar application also caused a significant (10%) reduction in fruit flesh. Nitrogen sprays slightly depressed the percentage of flesh oil while soil nitrogen dressing had no such effect. Trees sprayed with KNO3alone, however, had slightly more oil % dry flesh. Urea+KNO3 sprays depressed oil production most, and in November the average percentage of flesh oil in the sprayed trees was 88.39% that of controls, i.e. 52.58 and 54.49%, respectively

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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