Study results and suggestions for hop fertilization changes
Czesław Szewczuk
Danuta Sugier
Abstract
The Polish hop fertilization system was “adapted” from Czech Republic and Germany. It particularly refers to nitrogen fertilizer rates that are estimated on the basis of yield achieved (10 kg per 100 kg of cones). At present in the Czech Republic and Germany, nitrogen doses are also calculated on the basis of mineral nitrogen content in the soil profile. Moreover, the results of the chemical analysis of the leaves are taken into account in the Czech Republic. Phosphorus, potassium and magnesium fertilizer rates are estimated basing on the soil abundance in Poland, whereas in Germany, they also depend on the achieved yields. Limit values accepted in Poland and referring to the content of these component, as well as fertilizer rates seem to be too high in relation to hop nutrition requirements. Phloem necrosis – a dangerous physiological disease – occurring on many Polish hop plantations confirms that fact. Zinc deficiency is the reason for phosphorus excess in the soil that blocks its intake. Therefore, there is a need to verify those values and fertilizer rates estimated on that basis.
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