Scientific basis of approval of planting periods and standards of winter barley varieties in rainfall lands

This article analyzes stem height, crop structure, productivity and effect on grain quality of barley varieties. According to the results of the experiment, it was noted that the highest plant height in the full ripening phase of Lalmikor and Mushtarak varieties of barley was 62.8-64.6 cm and 62.4-64.1 cm in the early (October 15) planting period. In both varieties, stem height resulted in lower plant height with delayed planting dates. The decrease in the planting rate caused the plant to grow taller. In all planting periods, the plant height was the highest in the option with 2.0 million grains/ha of seeds, and the shortest in the option with 3.0 million grains/ha of seeds. The number of productive stems in the Lalmikor variety was from 176.1 to 235.2 grains per 1 m2, and this indicator was 12.7 to 8.4 more than the Mushtarak variety. While the number of productive stems per 1 m2 was the highest 235.2 in the Lalmikor variety, when the sowing rate was 2.5 million grains/ha and planting time on October 30, 226.8 grains were observed in the Mushtarak variety, in which 3.0 million grains/ha of seeds were used on October 15.

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