Proper and timely fertilisation of sunflowers and corn is the basis for stable and high yields. Even with ideal hybrid genetics, the crop will lose some of its potential if, at the moment of greatest physiological stress, the plant does not have access to critically important micronutrients. Among them, boron and zinc are leaders in terms of their impact on development, resistance and future productivity.
Why is boron important for sunflowers?
Sunflowers have one of the highest boron requirements among oilseeds. Boron is responsible for:
- the formation of generative organs — basket formation and proper flowering;
- stress resistance and heat resistance;
- the movement of sugars and carbohydrates, which affects seed filling;
- strengthening cell walls — less risk of brittleness and disease.
Critical phase of boron application for sunflowers
It is most effective to apply boron in the following phases:
- 4–6 leaves — period of active growth and root system formation;
- budding — basket formation and future yield;
- beginning of flowering — for better pollination and seed uniformity.
Deficiency at this time leads to cavities in the basket, deformations and reduced oil content.
Zinc — a key micronutrient for corn
Corn is extremely sensitive to zinc deficiency due to its intense growth rate. Zinc is necessary for:
- the synthesis of the hormone auxin, which controls plant growth and formation;
- cold resistance, especially at the start;
- the formation of generative organs and cobs;
- the formation of a strong root system.
It is zinc deficiency that most often leads to ‘white leaves’, stunting and delayed development.
Critical phases of zinc application for corn
The most important periods for fertilisation:
- 2–4 leaves — the first critical phase, when the basis for future yield is laid;
- 6–8 leaves — the period of active cob and root system formation;
- before tasselling — ensuring uniform development of generative organs.
Timely application of zinc can increase corn yield by 10–20%.
Sunflower and corn: general nutrition logic
Both crops have clearly defined critical phases when micronutrients are absorbed most efficiently. Proper application of boron and zinc ensures:
- a friendly start and development;
- resistance to cold, heat and drought;
- better pollination and filling;
- increased yield and oil content/weight of 1000 grains.
Conclusion
Boron for sunflowers and zinc for corn are not just fertilisers, but strategic elements of technology. Applied at the right time, they relieve stress, stimulate growth and ensure maximum productivity potential for plants.
By controlling critical phases, farmers can achieve stable yields even in difficult years.