The Effect of Planting Period And Strategy on Sunflower Variety Yield

Abstract

the article cited data on the yield of sunflower varieties ertapishar SAMQKHI 20-80 and SUR varieties when planted as a recurring crop on land vacated by Bush grain crops in different (July 1; July 10; July 20) terms and in 70x20x1; 70x25x1; 70x30x1; 70x40x1 CM planting schemes. As the planting period was delayed from July 1 to July 10 and from July 10 to July 20, there was a decrease in yield depending on the variety. In all the planting schemes studied, from 70x20x1 CM to 70x40x1 CM of nutrition there was a good growing development of plants due to the expansion of the area, but due to the low number of bushes at the expense of the area, a very high yield was not obtained on the account of hectares. As planting dates were delayed, the flowering phase of the plants corresponded to the 2 decade of September. At these times, due to the reduction of light days compared to sowing in the period of July 1, the pollination process did not pass in moderation due to the observation of wind, dust dust and precipitation, and at the expense of hectares, the yield decreased by 10-12% for the period of July 1 and 15-17% for the period of July 20. The highest yield in general was obtained in the samqxi 20-80 variety in a 70x30-1 cm planting scheme for the period of July 1 to 33.8 s/Ha. Also for the period of July 1 by the Sur Variety, the highest yield was achieved in the 70x25-1 cm planting scheme with an indicator of 29.5 s/Ha.