Foliar fertilisation of maize is especially important when the plant cannot efficiently take up nutrients through the roots. This may happen during drought, low soil temperature, weak root development or major weather fluctuations.
Under such conditions, maize may have access to nutrients in the soil, but it is not always able to use them effectively. The plant slows down, develops a weaker root system, photosynthesises less efficiently and may struggle to move through the next growth stages.
Why does maize respond to stress so quickly?
Maize has high nutritional requirements, and its growth rate during key stages is very intensive. Any limitation in water or nutrient uptake can affect plant condition and later yield potential.
The most common stress situations in maize cultivation include:
- drought and limited water availability,
- cold soil after sowing,
- weaker root system activity,
- temporary growth inhibition,
- physiological phosphorus deficiency,
- problems with plant water management.
This is when foliar fertilisation can be a valuable addition to the fertilisation strategy, as it allows nutrients to be delivered directly through the leaves.
Phosphorus in maize — why is it important?
Phosphorus is responsible for plant energy management, root system development and proper photosynthesis. In maize, it is particularly important at the beginning of vegetation, when the plant builds the foundation for further growth.
The problem appears when the soil is cold or dry. Under these conditions, phosphorus uptake through the roots may be limited. Symptoms are often visible as growth inhibition, weaker plant vigour and characteristic purple discolouration of the leaves.
Foliar phosphorus application can support maize when the root system is not yet working at full capacity.
Potassium and proline under drought stress
During periods of water deficit, potassium plays a major role. This nutrient is involved in regulating water management, stomatal activity and maintaining cell turgor. Well-nourished maize can cope better with temporary water stress.
Proline acts as an osmoprotectant. In practice, this means it supports the protection of cellular structures under stress conditions, helps stabilise metabolism and limits the negative effects of high temperature and water shortage.
The combination of potassium and proline can be a valuable element of a programme supporting maize during dry periods.
When should foliar fertilisation of maize be considered?
Foliar fertilisation of maize is worth planning especially when soil conditions limit nutrient uptake. It is not intended to replace base fertilisation, but to provide quick support when the plant cannot fully use the nutrients available in the soil.
A foliar treatment is worth considering when:
- maize starts slowly after cold conditions,
- purple discolouration appears on leaves,
- the soil is dry and roots are working less efficiently,
- plants are uneven or visibly inhibited,
- more days with high temperatures are forecast,
- the crop enters a phase of intensive growth.
The sooner the plant receives support under stress, the easier it is to maintain its growth rate.
Which nutrients are worth choosing under stress in maize?
When nutrient uptake through the roots is limited, the following are especially important:
- phosphorus — supports plant energy, root development and photosynthesis,
- potassium — helps regulate water management,
- proline — supports the plant during drought and high temperatures.
In a foliar fertilisation programme, it is worth considering a combination of products that supply these nutrients. One example is VitaFer MacroP, containing 27% phosphorus in foliar form, together with VitaExpert Stress Control, which provides 37% potassium and proline.
Such support can be particularly useful when maize is under pressure from drought, cold soil or temporary growth inhibition.
Stable yield starts with a response to stress
Maize cannot always wait for soil conditions to improve. When the root system takes up nutrients more slowly and the plant enters a period of intensive growth, well-chosen foliar fertilisation can help maintain its condition.
It is worth monitoring the crop, paying attention to leaf discolouration, growth rate and plant response to drought. These are the signals that show when maize needs support.
Check VitaFer solutions for foliar fertilisation of maize and choose a programme suited to the conditions on your plantation.
