Analysis of washout risk, soil temperature, and uptake efficiency for all plants.
Checking root activity levels and pollution risks.
Checking for heavy rain and soil temps...
Plants generally do not "eat" in winter. Applying fertilizer now is likely a waste of money as the roots are dormant. Wait until soil temperatures consistently hit 10°C (50°F) in spring.
Heavy rain is forecast in the next 24 hours. Fertilizer applied now will dissolve and float into storm drains before it enters the soil. This wastes product and pollutes local waterways.
Look for "SAFE" days with mild temps and light rain.
Plant roots act like a gate. When soil temperature drops below 10°C (50°F), the gate closes. Nutrients sit on the surface, doing nothing until they wash away.
Granular fertilizer is a salt. If applied on a hot, dry day without being watered in, it draws moisture OUT of the leaves and roots, causing chemical burns.