Abstract:

The potato with ‘Ningshu-4’ and ‘Longshu-3’ were taken as experimental material, and the field experiments of starch potato in Xiji, Ningxia Province, which were conducted to study the effects of different sowing periods on growth and quality of starch potato. The results showed that appropriate to defer the date of starch potatoes in favor shorter growth period, for the two varieties, growth period of ‘Longshu-3’ was shorter than ‘Ningshu-4’, ‘Longshu-3’ sowed on April 13th and April 20th and the flowering time ahead 32 days and 16 days than the same time to sow the ‘Ningshu-4’; Different sowing dates between LAI, plant (stem) leaf area and total leaf area had a close relationship; ‘Ningshu-4’ choose the date around the April 20th or May 25th and ‘Longshu-3’ choose the date around the April 20th to planting can get the better quality starch potatoes, the starch content and reducing sugar content of ‘Ningshu-4’ was 58.85%, 0.1% and 57.28%, 0.044%, the starch content and reducing sugar content of ‘Longshu-3’was 53.88%, 0.038%. Different sowing periods have different commodities, commodity rate of ‘Longshu-3’ slightly higher than ‘Ningshu-4’.