Advisor(s)
Abstract(s)
Two field trials (FieldExp1 and FieldExp2) and a pot experiment (PotExp) were c0onducted over a period of 3 years to assess
olive tree response to nitrogen (N) applications and to estimate apparent N recovery. FieldExp1 was installed in a 3-year-old olive grove.
FieldExp2 consisted of a plantation of young rooted plants. Two treatments were applied in both experiments: N application and a
nonfertilized control. In PotExp, 4 N rates were used. In FieldExp1, olive yield significantly increased with applied N in only 1 of the
3 growing seasons. In FieldExp2, aboveground dry matter yield significantly increased with N application. In PotExp, total dry matter
yield displayed a typical saturation curve in response to N rates. The poor response of olive yield to N application might be due to the
reduced amount of N removed in the crop, and also to the negative interaction found between N application and water deficit. Apparent
N recovery reached values varying from 13.1% in FieldExp2 to ~100% in PotExp. The results indicate that the olive response to N and N
use efficiency seem to be influenced more by the agroecological conditions defining target yield and N loss, rather than by plant species.
Description
Keywords
Apparent nitrogen recovery Field trials Olea europaea Olive yield Pot experiment
Citation
Ferreira, Isabel Queirós; Arrobas, Margarida; Moutinho-Pereira, José Manuel; Correia, Carlos Manuel; Rodrigues, Manuel Ângelo (2020). The effect of nitrogen applications on the growth of young olive trees and nitrogen efficiency. Turkish Journal of Agriculture and Forestry. ISSN 1300-011X. 44, p. 278-289
