Chemical composition of grain and protein yield of spelt varieties depended on selected agrotechnical factors

Field trials have been carried out in Experimental Station Swadzim belonged to Poznan University of Live Sciences to evaluate the influence of sowing date and sowing rate on content of nutrients in grain and protein yield of 2 spelt varieties. Sowing was done in 1st and 3rd decade of October at amount of 200, 300 and 400 kg of spikelets/ha. The content of total protein of tested varieties amounted app. 14 percent DM. The differences in protein content caused by tested factors, although confirmed statistically, were small and ranged for sowing densities from 13.91 to 14.04 percent and for sowing dates from 13.61 to 14.38 percent. The increase of sowing rate caused higher protein yield up to 0.208 for var. Baulaender and 0.452 kg/ha for var. Schwabenkorn 0.452 kg/ha, per each kg of spikelets/ha. Higher protein yield was observed at earlier sowing date despite from different reaction of varieties to delayed sowing