Field records and research

What was done. What was observed.

Named sites, documented interventions and observations from the Herbafertil field archive.

Spruce vitality monitoring

56 trees followed through successive growing seasons.

A presentation prepared by Maks Udov reports vitality assessments of 56 spruce trees, with measurements by Dr Lacković (Arbofield) and oversight by Dr Pernek.

Spruce vitality monitoring — Spring 2023 — Spring 2023

Spruce vitality monitoring — Spring 2024 — Spring 2024

The photographs are labelled spring 2023 and spring 2024 in the source presentation. They show the same setting from slightly different positions.

Share of trees rated in good condition

22% → 45%Spring 2023 — Autumn 2024

The presentation records a rise in the share of trees rated in good condition, from 22% in spring 2023 to 45% in autumn 2024. The share rated moderate fell from 69% to 47%.

These are observations of the monitored group. The source does not show an untreated control group, so the figures describe the recorded change rather than an isolated treatment effect.

Source and observation period

Maks Udov · presentation for municipal companies · slides 28–29. The vitality chart covers spring 2023 to autumn 2024; the photographs cover spring 2023 to spring 2024.

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Field documentation

Catalpa: field research in Zagreb

The source places this catalpa at the Faculty of Forestry and Wood Technology in Zagreb and identifies July 2022–July 2023 as the research period.

Herbafertil installation and subsequent canopy development are documented in the field presentation.

The stated research period is not an independently verified capture date for each photograph.

Catalpa recovery — Zagreb — Before treatment — Before treatment

Catalpa recovery — Zagreb — After treatment — After treatment

Field documentation

Ginkgo: a recorded intervention in Požega

The source shows the ginkgo on Požega’s main square before and after a Herbafertil intervention. It does not state the exact dates of the photographs.

Ginkgo recovery — Požega — Before treatment — Before treatment

Ginkgo recovery — Požega — After treatment — After treatment

Field documentation

A street-tree intervention in Celje

The field record describes the first visible improvement four months after installation. Exact capture dates are not supplied for the comparison photographs.

Street-tree revitalisation — Celje — Before treatment — Before treatment

Street-tree revitalisation — Celje — After treatment — After treatment

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