| Abstract: In order to determine the best planting density of chronatic potato 'Red rose' under the condition of mechanized sowing in Linyi city, the experiment of planting density was carried out with the same row spacing of 90 cm and different plant spacing (14 ,18, 22, 26 cm). The effects of different treatments on potato emergence stage, budding stage, flowering stage, maturity stage, plant height, stem diameter, main stem number, incidence of potato late blight, yield and commercial rate were analyzed. The results showed that with the increase of planting density, there were no effects on the phenological period of 'Red rose', but the plant height and the number of potato late blight increased, the stem diameter and main stem number decreased, and the commercial potato rate and yield showed a downward trend. Under the density of 90 cm row spacing and 22 cm plant spacing, the commercial yield was the highest at 2 129.25 kg per 667 m2, and there was no occurrence of potato late blight. |