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In order to investigate the possibility of delayed potato cultivation and also to compare delayed cultivation with normal cultivation in June on water consumption and quantitative and qualitative yield of potatoes, an experiment was conducted in two cropping years 2019 and 2020 in Hamedan Agricultural and Natural Resources Research and Education Center. In this experiment, three potato cultivars including “Sante” (Medium ripening cultivar ), “Arinda” (early ripening cultivar) and “Banba” (semi-late ripening cultivar) were planted on four planting dates; 1- 5st of June (usual cultivation of the region), 2- 22st of June 3-6st of July and 4-21st of July. In this experiment, drip irrigation system was used. The measured traits included the time required to obtain 90% of germination, number of stems, full coverage and flowering time, tubers produced in seed size, large size, small size, deformed and with secondary growth, total tuber yield and water use efficiency. Significant pests such as leafhoppers, mites, aphids and whiteflies were also estimated during the growing phase. At different stages of growth, the symptom and severity of diseases influenced by soil moisture, such as rhizoctonia canker, black scurf, black dot, common scab, and the percentage of secondary growth of tubers were also determined. Based on the results of combined analysis of variance obtained from the experiment during two years, it was found that the effects of cultivar and culture date on all growth traits, number and weight of small, medium and large tubers as well as number and weight of deformed tubers, total tuber yield, water use efficiency and the damage of important pests and diseases of potatoes became significant. Also, the interaction of cultivar and planting date was significant in most growth traits as well as tuber yield and tuber dry matter percentage. By comparing the mean results, it was found that in all three cultivars, in terms of number and mean weight of large tubers, the planting date was the highest value on 5 June, which showed a significant difference with the other three planting date. However, in terms of medium-sized tubers, the date of delayed culture and normal culture (5 June) were not significantly different. In terms of small size and malformed tubers, the usual planting date (5 June) and 22 June had a higher value than the two delayed planting dates, although the response of the studied cultivars was different. The increase in tuber yield with planting on 5 June compared to delay planting date in three cultivars was 4.8 tons per hectare. While water use efficiency in delayed planting date compared to normal cultivation (5 June) increased by 1.5 kg / m3 (27%). In the study of pest population and damage of important potato diseases, there was a significant reduction in the amount of important pests such as mites, aphids, leafhoppers and greenhouse whiteflies in delayed planting date compared to conventional planting date. Delayed planting date also significantly reduced damage for four major diseases included rhizoctonia canker, black scurf, black dot and common scab. Key words: Water consumption, Potato, Delayed planting date, Tuber yield, Disease management
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