Glasshouse and laboratory experiments were conducted during 2009-2010 in the Institute of Plant Protection in Poznań. The aim of these trials was to determine an influence of seaweed extracts (Ecklonia maxima and Saragassum spp.) and a humic (12%) and fulvic (6%) acids mixture on the germination, early growth and development of maize depending on the method of application. Trials involved soaking of seeds in aqueous solution of seaweed extracts and humic substances, soaking seeds and than foliar application and finally, two foliar applications. Foliar applications were done at growth stages BBCH 12-13 and 14-16. Experiments involved seed germination, chlorophyll content and fresh weight of shoots and roots. Results shows different action of tested substances on maize depending of application method. Seaweed extracts stronger induced seed germination than humic substances. Joint seed and foliar application and double foliar application promote shoot and root growth.

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