The purpose of the study is to determine the characteristics of growth, development and productivity of varieties and hybrids of sweet corn by cultivation in the soil and climatic conditions of Karakalpakstan. In 2017-2019 the growth, development and yield of 8 varieties and 8 hybrids of sweet corn were evaluated in the conditions of Karakalpakstan. Carried out a selection of the varieties and hybrids which based on the chosen with the best results of varieties and hybrids of sweet corn and those were recommended for further studies. After sowing seeds of 8 varieties and 8 hybrids of sweet corn, the duration of the germination period was 7-9 days. Of the studied varieties and hybrids, ‘Zamin’, ‘CanPedro 2 Inta’, ‘Berys’ had relatively early germination, ‘SPV 1022’, ‘Leonard's Early’, ‘Honey Bontham F1’, ‘Spirit F1’, ‘Megaton F1’, ‘Baron F1’, ‘Soyan F1’, ‘Hybrid F1’ had relatively late germination of 9 days. It has been established that the period from germination to the stage of formation of the seventh leaf is 13-16 days, the period from the stage of formation of the seventh leaf to the formation of a panicle is 23-33 days, the period from the formation of a panicle to flowering is 4-6 days, the period from flowering to the formation cobs is 9-15 days. In the studied varieties and hybrids, the period from the formation of cobs to milky ripeness was 13- 18 days, from 1 st stages of ripeness to 2 nd stage of ripeness lasted up to 4-8 days. A study of the duration of the development phases of varieties and hybrids showed that the period of growth from germination to 1 st and 2nd stages of ripeness is 75-85 days. Early yield was observed in hybrids ‘Baron F1’, ‘Sweet star F1’, ‘Spirit F1’, ‘Soyan F1’, vegetation period 73-77 days, relatively early yield was observed in varieties and hybrids ‘Zamin’, ‘Sentinel F1’, ‘SPV 1022’, ‘Osnova 209’, ‘Hybrid F1’, ‘Can Pedro 2 Inta’, ‘Clx3349ys clause’ growing season 79-81 days. The selection of varieties and hybrids most appropriate to the soil and climatic conditions of Karakalpakstan was carried out and recommended for cultivation by farmers and dekhkan farms.