Abstract:

Under condition of field cultivation, potato ‘Jizhang No.8’ were sprayed with paclobutrazol (PP333) and chlormequat chloride (CCC) in squaring period, flowering period and starch accumulation period to study their effect on yield constituents . The results suggested that: spraying PP333 and CCC could increase the yield and chlorophyll content, and decrease the average strain height of potato in all stages. The strain height was the lowest in squaring period. The production and chlorophyll content of potato increased most in the flowering period and lest in starch accumulation period. The strain height decreased range was 16.1%-43.4%, the SPAD value increased range was 1.8%-36.5%, the yield increased to 1.7%-35.57%. So flowering stage was the best growth period of potato to spray PP333 of 675 g/hm2 and CCC of 400×dilution rate, the yield increased to 35.57% and 28.0% respectively.