Articles
SLOW-RELEASE FERTILISER EFFECTS ON KIWIFRUIT ORCHARD
Article number
444_42
Pages
273 – 278
Language
Abstract
The use of slow-release fertilizers has been tested with the aim of decreasing nitrate leaching after addition to the soil and reducing the pollution risk to the environment.
The discussion regards data observation over a period of 4 years (1991–1994) carried out during an existing trial at the experimental farm of Capocotta (Rome) on ‘Hayward’ homogeneous micropropagated vines with a male/female ratio of 1 to 8. The vines were planted in the spring of 1983 at a distance of m 5 x 4 and trained on a horizontal trellis (tendone). They were irrigated using two types of emitters together: drip and mini-sprinklers.
The discussion regards data observation over a period of 4 years (1991–1994) carried out during an existing trial at the experimental farm of Capocotta (Rome) on ‘Hayward’ homogeneous micropropagated vines with a male/female ratio of 1 to 8. The vines were planted in the spring of 1983 at a distance of m 5 x 4 and trained on a horizontal trellis (tendone). They were irrigated using two types of emitters together: drip and mini-sprinklers.
The following treatments were applied:
- Split application of P and K in autumn and N applied in the spring (traditional fertilization as control).
- Single application of Nitrophoska gold fertiliser with nitrogen in slow-release form;
- Single application of a fertiliser with slow-release form of N, P and K (in 9 months).
- Single application of a fertiliser with slow-release form of N, P and K (in 5 months).
- Single application of a fertiliser with slow-release form of nitrogen (in 5 months) and P and K in normal-release form.
- Single application of a fertiliser with slow-release form of nitrogen (in 3 months) and P and K in normal-release form.
All the vines received the same amount of fertiliser-equal to 150 kg/ha of nitrogen, 90 kg/ha of phosphorous (P2O5) and 150 kg/ha of potassium (K2O).
The average fruit weight and the phosphorous and potassium contents on the leaves were not influenced by the treatments, but the nitrogen content on leaves and fruits was.
The cumulated yield production/tree was positively influenced by the Nitrophoska fertiliser with no significant statistical differences from the traditional split applications of N, P and K treatment and the slow N form in the 5 months released.
On the contrary the NPK slow-release form in 5 and 9 months determined a negative influence on production.
Publication
Authors
F. Monastra, G. Strabbioli, E. Raparelli, E. Turci, M. Cappelloni, V. Vivanti
Keywords
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