- Turkish Journal of Agriculture and Forestry
- Vol: 44 Issue: 3
- The effect of nitrogen applications on the growth of young olive trees and nitrogen use efficiency
The effect of nitrogen applications on the growth of young olive trees and nitrogen use efficiency
Authors : Isabel Ferreira, Margarida Arrobas, José Moutinho-pereira, Carlos M. Correia, Manuel Angelo Rodrigues
Pages : 278-289
Doi:10.3906/tar-1905-26
View : 9 | Download : 7
Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :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.Keywords : Apparent nitrogen recovery, field trials, Olea europaea, olive yield, pot experiment