Roles of nutrients in nuts by crop growth stage

Budburst - flowering

• Nitrogen and potassium – reactivate and promote the early growth of new plant tissues leading to maximum tree productivity
• Phosphorus – to build tree reserves and maintain root development
• Calcium - boost reserves and provide a strong platform for high yields
• Boron and zinc* – if not already applied post-harvest - to maximise flowering and strong fruit set 
• Iron – If deficiencies are seen

 Fruit set

• Nitrogen – maintain leaf development and fruit development
• Potassium – to maximise growth and early fruit uptake
• Calcium – maintain strong growth of healthy tissues
• Sulphur – to maximise nitrogen efficiency in the tree and improve oil and fat content of the fruit
• Boron and zinc* – to maintain growth and development of the flower and developing fruit tissue

 Fruit fill - maturity

• Potassium – to build fruit quality during this critical phase
• Nitrogen – in lesser amounts to maintain growth alongside higher rates of potassium
• Calcium, zinc and boron* –to help improve fruit integrity and improve quality and storability

 Post-harvest - prior to leaf senescence

• Nitrogen and potassium – to build tree reserves and hence be available for new growth once it commences in the following season
• Calcium and phosphorus – to revitalise rooting and ensure strong availability for the following season
• Boron and zinc* – to build levels in tissues and produce strong spring budburst and flowering in the following crop

* Foliar spray preferred