Función de Magnesio en frutales de pepita
Manganese is involved in a wide range of enzyme processes including hormone synthesis. It also plays a key role in photosynthesis. It is particularly important in maintaining leaf quality and tree health in apples.
Manganese effect at growth stages
| Stage | Manganese effect |
| Bud Burst - Start of Flowering | To maximize tissue growth |
| Fruit Fill - Maturity | Along side with phosphorus will promote fruit coloration |
General Guidelines for Manganese Application
Foliar manganese, applied at least twice in the spring, can improve leaf color and minimize leaf drop and blotchiness. Sprays in the autumn are less effective because manganese is relatively immobile and won’t move from reserves to the leaf.
Manganese Deficiencies in Apples
Manganese deficiency is first seen as light green spots on leaf margins and as an interveinal mottling. Usually the recently matured leaves in early summer growth are the first to show symptoms.
Interveinal areas then become yellow, with prominent green veins. When severe, leaves and shoots become stunted although generally there is little change from normal leaf size and shape.
Excessive amounts of available manganese uptake – associated with low pH soils and poor drainage – results in necrosis of trunk and branch bark (measles).
Mangnese and Leaf Quality
Trials with Golden Delicius apples in Italy show that foliar manganese, applied at least twice in the spring, has proven to be most effective at improving leaf color and minimizing leaf drop and blotchiness.
Manganese and background fruit color
Manganese sprays can also be applied to improve the background, green color in fruit.
