PLANT PROTECTIONNUTRITIONTRAININGCONSULTINGTechnical articles and videos on plant protection, training systems, nutrition and new cultivars.
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Chilling Hours, Utah Chill Units or Dynamic Chill Portions — what each measures, which suits which climate and season, and three calculators embedded in the page, one per model, running entirely in the browser.
Chilling hours, Utah units or Dynamic portions — three different quantities that do not compare. How much chilling each cultivar needs, what the dormancy-breaker trials actually show, the 70% rule, and what is permitted on cherry in Greece.
Flowering is decided in June and July of the previous year. What is inside the bud, why the first five nodes do not count, the confusion between chilling hours and chilling units, and how the annual 120-day emergency authorisation actually works.
The chemistry, the mode of action and the eight authorised uses in Greece with the official rates. Where the phytotoxicity limits are, what the studies show about beneficials, and why contact with acids is the gravest hazard.
Fungi, oomycetes, bacteria, phytoplasmas, viruses and viroids, organised the way they are diagnosed. Where the symptom starts, how it spreads, and what the stem cut shows - with an explicit field and greenhouse distinction.
The eight modern systems of PNW 667 with spacings and year-by-year steps, the classical Greek forms, and what the comparative trials in Italy, Tasmania and Turkiye showed — including where the Greek guide and the international literature openly disagree.
A yellow leaf does not say which element is missing. The mobility rule, the three exceptions that break it in fruit trees, a tool that ranks hypotheses from the position and form of the symptom, and why for iron the leaf analysis does not work.
Calcium moves only in the xylem, and the pathway closes before ripening — which is why late sprays cannot work. Thresholds, cracking, hydro-cooling, and the dose that reverses.
The arrow diagram in every fertiliser leaflet does not stand up scientifically. The antagonisms are real, but they act on two separate levels — in the soil and inside the plant — and the same element can be antagonistic on one and synergistic on the other. With a tool showing the documented relationships of each element.
It is a cation exchanger — it holds ammonium and potassium, not nitrate. The rates that work are tens of tonnes per hectare, not hundreds of kilos. And erionite is a Group 1 carcinogen.
The real annual nutrient removals in kg per hectare from long-term Spanish trials, the limits of leaf analysis, why nitrogen is usually a problem of excess, and what actually drives alternate bearing.
The vine takes up more calcium than any other element, yet only 8 kg per hectare leave with the fruit, and 80% of it enters within fifty days of fruit set. How many kilograms of each element are actually removed, why excess nitrogen halves storage firmness, and what a 2025 trial failed to confirm.
Chilling Hours, Utah Chill Units or Dynamic Chill Portions — what each measures, which suits which climate and season, and three calculators embedded in the page, one per model, running entirely in the browser.
The videos are in Greek.
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