05 May, 2026

Foliar Combo gives maize crops the start they need

By: Philip Cosgrave

Yara’s maize trials, have demonstrated the positive effect that combining foliar nutrition and biostimulants had on crop performance.
Spreader on a Maize field
Spreader on a Maize field

The combination of our crop specific product for Maize - YaraVita Crop Boost (5 L/ha) and the biostimulant - YaraAmplix Optitrac (2 L/ha) applied at the 5-leaf stage increased dry mater yields by 16%, equal to 2.5 tonnes of dry matter per hectare.

When applied together, Optitrac complements the nutritional effects of Crop Boost. The unique combination of selected bioactive components and nutrients in Optitrac activates the plant’s metabolic processes to enhance nutrient use efficiency and tolerance to abiotic stress for example due to the application of herbicides. Both these products work in harmony to maximise the ability of Crop Boost to promote root and plant growth and efficiently use the plant’s energy reserves.

Crop Boost is formulated for foliar applications on maize, containing a high concentration of phosphorus, zinc, magnesium and potassium. Yara conducts nutrient specific trials to prioritise nutrients according to their impact on crop growth and development. Once these are established then crop-specific products can be formulated to deliver enough quantities of these specific nutrients.

The results of two years of maize trials in both the UK and Ireland have demonstrated an economic justification of using Crop Boost and Optitrac together. There is a very strong case to adopt the Yara biologicals maize programme at the 4 – 6 leaf stage to minimise the risk of nutrient deficiencies and abiotic stress in maize and maximise yields.