PRODUCTIVITY OF EARLY VARIETIES OF SUNFLOWERS SOWN AT DIFFERENT TIMES IN IRRIGATED CONDITIONS OF UZBEKISTAN

Abstract

This article provides information on the growth and yield of varieties of sunflower grown in irrigated conditions of Uzbekistan - March 10, March 20, March 30, April 10 and April 20, the growing season is 80-85 days, 90-95 and 100-105 days. . Grasses formed from seeds sown in a very early period (March 1 and 10) are susceptible to fungal diseases in the early days of spring under the influence of excess moisture and low temperatures, and the bush numbers are reduced by 1.5–3.2%. Yield is less than 4.3–5.4 ts / ha. As the sowing period is delayed until April 20, during the flowering and ripening phases of sunflower, under the negative influence of high temperatures, the yield is reduced to 0.3-0.7 ts / ha and the oil content in the seeds to 0.3-0.6%. 31-33 ts / ha of early ripening varieties of sunflower grown as the main crop in Samarkand region. and 34.0-35 ts / ha.cha from early middle-aged varieties. It is advisable to sow in the period from March 30 to April 10 to achieve quality yields