The influence of weather conditions and sowing term on the winter barley yield formation process
1995
Molnarova, J.
Field polyfactorial experiments investigated yield formation of two winter barley varieties. Precipitation was very important, and had the biggest influence on the duration of the first critical "sowing germination" period. The highest number of plants per square metre was determined by the September sowing term and by precipitation of 130 % of cl. n. With the October sowing term the field germinability fell by 1 % each day, resulting in a yield lapse of 27.8 kg per ha. October sowing term stands were in the 3rd critical period later than those of September; temperatures were higher causing the number of productive shoots to fall from 0.27 to 0.21, the yield to decrease from 14.6 kg per ha and the 4th critical period to shift to May (precipitation 48.8, resp. 37.7 % of cl. n.). The number of grains per spike fell to 2.75 and the grain pro spike production capacity fell to 4,719 grains per square metre, resulting in a yield lapse of 33.8 kg per ha. The correlation between plant number after germination of productive shoots, spikes, the number of grains per spike, the weight of 1,000 grains and the sum of precipitation was from middle strong to strong. The same correlation held between average day temperature, the sum of temperatures and plant number in spring, number of spikes and the thousand grain weight
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