Foliar fertiliser by drone — what it can do, and how it differs from soil fertiliser

A common question is whether drones can be used to apply fertiliser. The answer is yes for foliar fertiliser, but there are conditions you should understand.

Foliar and soil fertiliser do different jobs

Soil fertiliser supplies the main nutrients in large amounts, taken up through the roots. It is the main source of nutrition throughout the season.
Foliar fertiliser supplies nutrients in small amounts that the plant can use quickly. It is suited to correcting specific deficiencies, or topping up at times when the plant has especially high demand.

Foliar fertiliser cannot replace soil fertiliser, because the amount leaves can absorb is limited. Trying to supply all the main nutrients through the leaves means spraying very often, with a risk of leaf burn.

Advantages of foliar spraying by drone

It can get into fields when vehicles or people cannot.
It is fast over large areas.
It spreads evenly when set up correctly.

Points of caution

Too high a concentration can burn leaves, especially when spraying in strong sun or when plants are stressed by drought.
Some fertilisers form sediment easily when mixed with other products. Test before mixing in the real tank.
Some products corrode parts of the spray system. Clean it thoroughly straight after use.

The right time

Early morning or evening, when the temperature is not high and the leaf pores are open, gives better absorption and lowers the risk of leaf burn.

Planning together with soil fertiliser

Treat foliar fertiliser as a supplement to the whole season's nutrient plan, not a shortcut. Soil analysis and planning the main fertiliser remain the most important foundation.

You can ask our team about planning foliar spraying together with other work in your field. Important note This article explains general principles. It is not a recommendation for any specific chemical. Suitable mixing rates and timing differ by substance, crop, growth stage and field conditions. Always treat the product label as the authority, and ask our staff or an agricultural specialist before deciding.