Abstract: In order to promulgate the influence of different amount of N,P,K and planting density on fresh roots yield and dry matter content of the Sushu14 and identify the relationship between the fertilizer and density application levels with fresh roots yield and dry matter content,the experiments were carried out with Sushu 14,with the design for canonical analysis.The results showed that the dry matter content and fresh roots yield could be augmented significantly if K and N,P were applied at optimum rates,the application of adequate potassium increased the dry matter content and fresh roots yield in sweet potato.The effect of each factor on dry matter content and fresh roots yield was K fertilizerP fertilizerplanting densityN fertilizer.And under the experimental condition,the main agronomic measures for yield more than 3.75×104 kg/ha and dry matter content more than 25% include 5.40×104 plants/ha,N:129.06-142.26 kg/ha,P2O5:36.21-65.82 kg/ha,K2O:245.88-289.89 kg/ha.Therefore,the effects of K fertilizer were stronger than that of N and P fertilizer on dry matter content and fresh roots yield,it was reversed for the effects of the two fertilizers on application.The applied proportion of N fertilizer and P fertilizer could be adjusted as needed for increased yield and dry matter content on sweetpotato.

Key words: Sweetpotato, Fertilizer application level, Transplanting density, Fresh roots yield, Dry matter content

CLC Number: 

• S531