Abstract: In order to study the influence of different fertilizer combinations on the starch content, plumpness and yield of buckwhear, tartary buckwheat cv. Wenku No.1 was adopted in the present study. It was shown that the number of main stem branch were the highest with normal nitrogen and phosphate application and higher potassium. With normal nitrogen and potassium application and no phosphate, the number of nodes on main stem was the highest. With less nitrogen, normal phosphate and potassium application, plant height was the highest and the thousand seed weight was the heaviest. With normal nitrogen, potassium application and phosphate, the number of grains per plant was the highest and grains were the heaviest. The total starch content was the highest when no fertilizer was applied. With no nitrogen, normal potassium and phosphorus, the content of amylase was the highest. With normal phosphate, less nitrogen and potassium, the amylopectin content was the highest. The plumpness of buckwheat was the highest with no potassium and normal nitrogen and phosphorus. The yield was the highest with normal nitrogen and potassium and higher phosphorus. There was significant positive correlation between the plumpness with yield and total starch of buckwheat.

Key words: tartary buckwheat, fertilizer, starch, plumpness, yield