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The work presents results of a research conducted in 2009-2011 to assess the yield and sugar content of selected maize (Zea mays L.) cultivars included in the Common Catalogue of Varieties of Agricultural Plant Species (CCA), harvested at various development stages, which affects the quality of animal feed produced, and select cultivars suitable for cultivation under the soil and climatic conditions of Poland. Two factors were examined in the study: A − the harvest date of maize green matter (I − tasseling stage (75% of plants at this stage), II − milk maturity stage (after three weeks), III − wax maturity stage (after another three weeks)); B − cultivars with different earliness of maturity: Pyroxenia – very early, FAO 130, Codimi – early FAO 200, Moschus – early, FAO 220, Alombo – medium early, FAO 230, and Celive – medium early, FAO 245. Total protein yield, dry matter and starch content, soluble sugars and reducing sugars were determined in maize plants. The obtained study results demonstrated that the highest total protein yield was produced by the following maize cultivars: Codimi, Moschus, Alombo and Celive harvested at the wax maturity stage. The highest starch content was determined in the plants of cv. Pyroxenia, Codimi, Alombo and Celive also harvested at the wax maturity stage. Maize plants of all the examined cultivars harvested at the milk maturity stage and cv. Pyroxeni harvested at the tasseling stage had the highest soluble sugars and reducing sugars.

YIELD AND SUGAR CONTENT OF EUROPEAN MAIZE (ZEA MAYS L.) CULTIVARS GROWN IN POLAND