In order to investigate the effect of tuber weight on the processing quality of different starch type potatoes,high-starch varieties Kexin 27,Vilas and Annongshu 1 and low-starch varieties Holland 15 and Longyushu 1 were selected as experimental materials,and tuber weights were set at 25,50,100,150 and 200 g.The processing quality indexes such as dry matter content,starch content and reducing sugar content of tubers with different weights were determined,and the differences of processing quality among tubers with different weights were analyzed.The results showed that the dry matter contents and starch contents of high-starch varieties Kexin 27,Vilas and Annongshu 1 increased with the tuber weight increasing from 25 to 150 g.The above indexes were no significant change at 150-200 g.When the tuber weight of Holland 15 and Longyushu 1 were 25-100 g,the dry matter content and starch content increased with the increase of tuber weight,and there was no significant change at 100-200 g.When the tuber weight of high-starch varieties(Kexin 27,Vilas and Annongshu 1)were 25-200 g,the reducing sugar content decreased with the tuber weight increasing.On the other hand,the lowering sugar concentration remained consistently at a high level when the tuber weight of the low-starch types(Holland 15 and Longyushu 1)were 25-200 g.In conclusion,high-starch potato varieties weighing 150-200 g could improve tuber quality.
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