In this paper, the effect of pH value on seed germinat ion and seedlings grow th and metabolism of wheat was studied. The results showed that pH value of 6.5 was optimum for wheat seed germination and seedling growth. If higher than pH=7 or l ower than pH=6, the activities of diastase, protease and lipase, respiration ra t e, endosperm decomposition rate during wheat seed germination were cut down and germination rate was slowed down. Roots activities and nitrate reductase activit y of roots, chlorophyll...