Yield of Early Maturing Sunflower Varieties, Different-Aged Crops as a Secondary Crop in the Zarafshan and Surkhandarya Oases of Uzbekistan

In Uzbekistan, oilseed sunflowers are grown mainly as a secondary crop on fertile land free from cereals. Every summer, 1.1-1.3 million hectares of irrigated land in the country are cleared of cereals. Due to the hot climate in the southern oasis (Surkhandarya region), grain is harvested in the first 10 days of June, and in the Zarafshan oasis (Samarkand region) in the third 10 days of June, winter wheat is harvested.. Due to the different weather conditions in Surkhandarya and Samarkand regions, the sowing period of sunflower as a secondary crop differs significantly.  Yields will also vary. Yields of early maturing sunflower SAI 20-80 and Dilbar varieties planted between June 20, June 30, July 10 and July 20 were analyzed as a repeat crop to determine the optimal planting time of sunflowers in both oasis soil climatic conditions

INFLUENCE OF THE MULTIPLICITY OF VARIETAL CLEANING ON THE QUALITY OF SUNFLOWER SEEDS AT DIFFERENT PLANT DENSITY

In thearticleis shown the influence to sorts quality of seeds grown in primary nursery for the production of elite seeds of sunflower with the density of 20,4 thousand, 23,8 thousand, 28,6 thousand, 35,7 thousand and sorts cleanness one time before blossoming, one time in mass blossoming, two times in riping period, one time before harvesting totally five times

A Variety of Soy Suitable for Harvesting in a Combine

Based on the analysis of important economic traits like root shape, stem length, height of the first crop branch above the ground, spreadability of grains during ripening, productivity of 7 varieties and 4 samples of soybeans grown in the hot Surkhandarya region of southern Uzbekistan, the variety information regarding the suitability of samples for harvest in a combine harvester is provided

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

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 yield