Effect of Alternative Nutrient Supplements on the Growth and Flowering of Marigold (Calendula Officinalis L.)

Csabai, Judit and Kolesnyk, Anzhela and Kish, Beatris and Grisechkina, Alexandra and Mendel, Antonina and Irinyiné Oláh, Katalin and Tóth, Mónika Fanni and Szabó, Béla and Tarek, Mohamed and Balogh, Attila and Györgyiné Kovács, Andrea and Kosztyuné Krajnyák, Edit (2025) Effect of Alternative Nutrient Supplements on the Growth and Flowering of Marigold (Calendula Officinalis L.). In: Fenntartható Tájgazdálkodási Tudományos Műhely konferenciája 2025 : Innovatív megoldások a XXI. század mezőgazdaságában. Nyíregyházi Egyetem, Műszaki és Agrártudományi Intézet, Nyíregyháza, pp. 92-97. ISBN 9786156032836

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Abstract

We investigated the effects of pruning Calendula officinalis and the application of three different soil improvement materials: rhyolite, pelletized poultry manure, and flocculant. In the pruning experiment, four rows of marigold seedlings were planted. The highest number of flowers was recorded in July (641 pcs), which then dropped to 129 pcs after pruning. The average flower diameter in the non-pruned rows ranged between 3.53 and 3.54 cm, while in the pruned rows it was only 3.00 to 3.16 cm. Based on the measurements, it was concluded that the regeneration period following pruning led to a temporary decrease in total yield. In the fertilization experiment, 640 seedlings were planted across two plots. In June, the rhyolitetreated rows produced the highest fresh flower weight (on average 12.42 g/row), while in July, the application of the flocculant resulted in the highest yield (average 488.6 g), compared to 362 g in the control. In August, the poultry manure rows produced 467.25 g, and the flocculant-treated rows yielded 487.33 g. On a yearly scale, the highest cumulative yield was observed in the flocculant-treated plants, averaging 980.76 g per row. The results suggest that the use of flocculant had a positive long-term effect on flower production in marigold, while pruning should be applied only purposefully and with proper timing.

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