Variation of the number of spikes per unit of crop area in different sowing densities of wheat

Broj klasova po jedinice površine ima značajan uticaj na formiranje prinosa kroz osobine, dužinu klasa, broj klasaka u klasu, broj semena u klasu, masu klasa, masu semena u klasu i masu 1000 semena. Cilj rada je izučavanje variranja broja klasova pšenice u različitim rokovima i gustinama setve. U istraživanja su uključene dve sorte pšenice (Prima i Simonida), u ogledu sa dva roka i tri gustine setve u dve vegetacione sezone. Rezultati su pokazali značajne razlike u broju klasova m-2, između sorti, prema gustini setve, po rokovima setve i između dve vegetacione sezone. U obe vegetacione sezone, najmanji broj klasova m-2 je nađen pri gustini setve 350 semena m-2 kod obe sorte i to 504,50 i 350,33 kod Prime i 520,50 i 371,83 kod Simonide, dok je najveći broj klasova m-2 utvrđen pri najvećoj gustini setve (750 semena) i to 558,32 i 372,50 kod sorte Prima i 590,17 u prvoj i 622,17 klasova kod sorte Simonida u drugoj godini. Broj klasova m-2 je varirao zavisno od genotipa, gustine setve, vremena setve i uslova u vegetacionoj sezoni.The number of spikes per unit area has a significant influence on yield formation, through characteristics spike length, number of spikelets spike- 1, number of seeds spike-1, mass of spikes, mass of seeds spike-1, weight of 1000 seeds. The aim of the work is to study the variation of number of wheat spikes m-2 in different sowing date and densities. Two varieties of wheat Prima and Simonida were included for study number of spikes m-2 in an experiment with two dates and three sowing densities in two growing seasons. The results showed significant differences for number of spikes m-2 between two varieties of wheat, sowing dates, sowing densities, and between between two vegetation seasons of research. In both growing seasons, the lowest number of spikes m-2 was found at the sowing density of 350 seeds m-2 in both varieties, namely 504.50 and 350.33 in Prime and 520.50 and 371.83 in Simonida variety, while the highest number of spikes m-2 was found at the highest sowing density (750 seeds), namely 558.32 and 372.50 in Prima variety and 590.17 in first and 622.17 spikes in Simonida variety in second year. The number of spikes m-2 varied depending on the genotype, sowing density, sowing time and conditions in the growing season