Influences of nitrogenous fertilizer forms on quality of amaranth under different water conditions

Pot experiment was conducted to study the effects of nitrogenous fertilizer forms on quality of amaranth under different water treatments. The results show, biomass and nitrate content of amaranth are decreased with the increase of NH4+-N/NO3--N ratio under a same water treatment, while, contents of Fe, VC, soluble sugar and amino acid of amaranth are increased with the increase of NH4+-N/NO3--N ratio. Under a same fertilizer treatment, Fe content of amaranth increased with the increase of water input; while, contents of soluble sugar, amino acid and nitrate of amaranth are decreased with the increase of water input. Vc content and biomass of amaranth are highest under the middle water treatment. These results indicate the proportion of NO3--N to NH4+-N which is suitable for a high quality of amaranth is 5:5.