Małgorzata Szczepanek

UTP University of Science and Technology in Bydgoszcz

Elżbieta Wszelaczyńska

UTP University of Science and Technology in Bydgoszcz

Jarosław Pobereżny

UTP University of Science and Technology in Bydgoszcz

Ireneusz Ochmian

West Pomeranian University of Technology in Szczecin


Among methods for stimulation of plant growth an essential role can be played by seaweed biostimulants. The aim of the study was to assess the response of onion to the method of application of the seaweed biostimulant Kelpak SL. Doses of the seaweed extract applied from the three-leaf stage amounted to 3, 3 + 2, 3 + 2 + 2 dm3 ha-1, and from the four-leaf stage 2, 2 + 2, 2 + 2 + 2 dm3 ha-1, for a single, double and triple application, respectively. The biostimulant applied from the three-leaf stage increased the chlorophyll index after double or triple application, whereas applied from the four-leaf stage, also after a single application. The highest increases in the fresh weight yield of bulbs as well as fresh weight of roots resulted from the triple application of the biostimulant from the three- or four-leaf stages. Each dm3 of the biostimulant caused an increase in the fresh weight yield of bulbs by 0.76 t ha-1, and each additional application resulted in an increase in yield by 1.76 t ha-1.


growth, leaf, leaf greenness index, root, bulb yield

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Małgorzata Szczepanek 
UTP University of Science and Technology in Bydgoszcz
Elżbieta Wszelaczyńska 
UTP University of Science and Technology in Bydgoszcz
Jarosław Pobereżny 
UTP University of Science and Technology in Bydgoszcz
Ireneusz Ochmian 
West Pomeranian University of Technology in Szczecin



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