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Basically, you should be cautious when fertilizing your fruit trees - especially when it comes to using nitrogen-rich fertilizers. They promote vegetative growth, ie the development of shoots and leaves. At the same time, the trees set fewer flowers and subsequently produce fewer fruits. Above all, the nutrient phosphate is required for flower formation - but like the potassium that is important for fruit development, it is sufficiently present in most garden soils. Especially an oversupply of potassium should be avoided at all costs. It affects the calcium intake and is - in addition to a calcium deficiency in the soil - a cause of Fleischbräune and stippige fruits. If you do not know the nutritional content of your soil, you should have it examined: The soil labs not only analyze nutrient levels, but also give specific fertilizer recommendations.
Organic or mineral fertilizer?
As a starting fertilizer, simply sprinkle with corn grit mixed ripening compost, rotten cattle manure or pelleted cattle manure under the treetop in the spring - but only in the outer third of the canopy, because near the trunk, the trees have hardly fine roots to absorb the fertilizer. During the growing season, it is best to fertilize with an organic fruit and berry fertilizer. Long-term fertilizer with sheep wool pellets improve the water storage capacity of dry soils.
You can of course also fertilize mineral and stone fruit minerally. Because these fertilizers dissolve faster and do not have such a lasting effect, you should divide the total amount by the end of July on several gifts.
Our fertilizer recommendation for pome and stone fruit
- Pome fruit (apples, pears and quince): Between the beginning of March and the beginning of April, mix 70-100 grams of horn shavings and 100 grams of algae lime or rock powder with three liters of mature compost per square meter and sprinkle them in the eaves area of the treetop. Fertilize with an organic fruit and berry fertilizer until the beginning of June (dosage as stated on the packaging)
- Stone fruits (cherries, plums and peaches): Between the beginning of March and the beginning of April, mix and apply 100-130 grams of horn shavings per 100 grams of algae lime or rock powder and four liters of mature compost per square meter. Fertilize until the beginning of June with an organic fruit and berry fertilizer