Effects of planting date on the growth and yield of romaine lettuce varieties

In this article, under the conditions of gray soils of the Samarkand region, the number of surviving plants per unit area (1 ha), the number of leaves, leaf width, leaf length, lettuce head weight, lettuce head diameter, as well as the effect of planting dates on the productivity of romaine lettuce varieties Sladkiy Khrust, Aktina and Batzio were studied. During the experiment it was established that when sowing the romaine lettuce varieties Sladkiy Khrust, Aktina and Bacio in a repeated crop at 5 planting dates, the number of surviving plants per unit area (1 ha) between the varieties was 72.0-77.8 thousand or 86.5-93.4%, the size (height) of the basal leaf was 25.0-30.6 cm, the number of leaves was 16.7-29.5, the leaf width was 5.4-9.9 cm, the leaf length was 14.1-21.9 cm, the diameter of the lettuce head was 17.2-25.4 cm, the weight of the lettuce head was 291.8-409.2 g, and the yield was 22.2-30.9 t/ha. Also, when replanting romaine lettuce varieties at different plantingtimes, the highest results for all varieties were recorded when planting on August 5, the yield was 28.3-30.9 t/ha, which is recommended for production.