Articles
FERTILIZATION WITH IRON-PHOSPHATES TO PREVENTIRON CHLOROSIS IN PEAR TREES
Article number
448_95
Pages
514 – 514
Language
Abstract
Effectiveness of iron-phosphate and iron-ammonium-phosphate in preventing iron chlorosis in pear trees (Pyrus malus L., var.
Blanquilla) was studied in field experiments at the IRTA Estació Experimental de LLeida, Spain.
Suspension of these fertilizers were injected into an iron chlorosis inducing calcareous soil.
The iron -phosphate or vivianite (VIV), and the ammonium-iron-phosphate (AIP) were applied at rates of 0.5 and 1 kg tree-1, Chelate as EDDILA (6% of Fe) at rate of 10 g tree-1 yr-1 and a control treatment (no Fe) were included in a randomized block design.
Other plant nutrients were applied by drip irrigation.
The leaves of the control trees showed a severe high iron chlorosis.
The leaves of the trees growing in soil treated with either VIV, AIP or chelate did not exhibit visual iron chlorosis symptoms.
The chlorophyll content in the leaves of trees treated with VIV and AIP was not significantly different from the chlorophyll content in the leaves of trees treated with quelate.
VIV and AIP were effectives in preventing Fe deficiency even at the lowest rate (0.5 g tree-1) and even after two years of application.
VIV and AIP seem therefore to be promising fertilizers aqainst iron chlorosis because of their effectiveness and their apparently persistent effect.
This contrast with the need to apply Fe chelate yearly.
In addition, they are environmentally friendly, since they release P and N slowly to soil.
Blanquilla) was studied in field experiments at the IRTA Estació Experimental de LLeida, Spain.
Suspension of these fertilizers were injected into an iron chlorosis inducing calcareous soil.
The iron -phosphate or vivianite (VIV), and the ammonium-iron-phosphate (AIP) were applied at rates of 0.5 and 1 kg tree-1, Chelate as EDDILA (6% of Fe) at rate of 10 g tree-1 yr-1 and a control treatment (no Fe) were included in a randomized block design.
Other plant nutrients were applied by drip irrigation.
The leaves of the control trees showed a severe high iron chlorosis.
The leaves of the trees growing in soil treated with either VIV, AIP or chelate did not exhibit visual iron chlorosis symptoms.
The chlorophyll content in the leaves of trees treated with VIV and AIP was not significantly different from the chlorophyll content in the leaves of trees treated with quelate.
VIV and AIP were effectives in preventing Fe deficiency even at the lowest rate (0.5 g tree-1) and even after two years of application.
VIV and AIP seem therefore to be promising fertilizers aqainst iron chlorosis because of their effectiveness and their apparently persistent effect.
This contrast with the need to apply Fe chelate yearly.
In addition, they are environmentally friendly, since they release P and N slowly to soil.
Authors
M.C. Campillo, V. Barrón, J. Torrent, S. Pérez
Keywords
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