Effects of allelochemicals on nitrogen absorption of wheat seedling

Effects of three allelochenmicals such as ferulic acid(FA)，benzoldehyde(BH)and 4-tert-bytylbanzoie acid(4-BA)on nitrogen absorption of wheat seedling are studied．The results show that N absorption from both N0^-₃ and NH⁺₄ decrease with the increase of concentrationsof allelochemicals．Nitrogen absorption from N0^-3 and NH⁺₄ by fifteen-day-old seedlings，which are grown in three culture liquids such as FA，BH and 4-BA(0．5g／L)，is 58% and 42%，50％and 19% ，53% and 33% of that in the controls respectively．Therefore，the negative effects of allelochemicals on nitrogen absorption of NH⁺₄are stronger than those of NO^-₃．Those negative effects tend to be smaller as seedling grows bigger．