Evaluation on developing of new varieties and lines of bread wheat tolerant to drought and heat on the rainfed areas of Uzbekistan

The high correlations are studied between the productive elements of the spike and the yield on the researches. It was studied that in different years, under the influence of weather conditions, the productivity of bread wheat varieties and lines. It was found that dry weather conditions, low rainfall and lack of soil moisture lead to a decrease in wheat yields on dry lands. Due to low rainfall in autumn and winter, lack of soil moisture, seeds germinate in spring time and prolongs the growing season was heat and drought conditions.