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Apple
Role of Nutrients by Apple Growth Stage

Role of Nutrients by Apple Growth Stage

Bud Burst - Start of Flowering

Nitrogen, Potassium and Magnesium – promote strong early growth of new plant tissues and maximum tree productivity

Phosphorus – maximize root development and flower cluster formation

Calcium – boost root and leaf growth and high yields

Boron – maximize pollination and strong flower development

Manganese – to maximize tissue growth

Zinc – to optimize bud burst and early leaf development

Fruit Set - Fruitlet

Nitrogen – in reduced amounts to maintain fruit fill

Potassium – minimize fruit disorders

Phosphorus – fruit set and development

Calcium – maintain good fruit quality and minimize fruit disorders

Magnesium – for reduced fruit drop

Boron – improve fruit set

Fruit Fill - Maturity

Nitrogen – in reduced amounts to maintain fruit fill and high sugars (excess can lead to rots and quality deterioration)

Potassium – maximize fruit weight, TSS levels in the fruit and minimize disorders and sunscald (but at levels that don’t compete with calcium)

Calcium – maintain good fruit firmness and storage quality

Manganese – alongside Phosphorus will promote fruit coloration

Post Harvest

Nitrogen and Potassium – boost reserves for next season’s early growth

Phosphorus – maximize bud development and early rooting and new tissue growth in the following spring

Calcium – maintain high levels in the tree

Magnesium, Boron, and Zinc – replenish reserves and strengthen new buds

See all articles about apple crop nutrition

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