关键词: 铵态氮, 硝态氮, 谷子, 形态, 生物量

Abstract: In order to study the effect of ammonium nitrogen and nitrate nitrogen on morphology and biomass of foxtail millet (Setaria italic L.), and to provide effective references for reasonable selection of suite nitrogen form to foxtail miller, vermiculite cultivation method was adopted with nutrient solution. The results showed that the 2 nitrogen forms could significantly affect the morphology and biomass of foxtail millet, and nitrogen forms had no significant influence on root morphology and spike length. But, there were significant differences in influence of nitrogen form on plant height, biomass, leaf area and leaf chlorophyll content. Compared with ammonium nitrogen, nitrate nitrogen increased root weight by 17%, stem weight by 32%, leaf weight by 39%, total biomass by 40%. Besides, nitrate nitrogen increased plant height by 38%, leaf area by 40%. Compared with nitrate nitrogen, ammonium nitrogen increased chlorophyll content by 173%, and spike weight by 12%. There were significant differences in root/shoot ratio and spike proportion. Compared with nitrate nitrogen, ammonium nitrogen had increased root/shoot ratio by 8% and spike proportion by 44%. The above mentioned results indicated that nitrate nitrogen could significantly promote plant height, leaf area and biomass. While, ammonium nitrogen could significantly stimulate the synthesis of chlorophyll and construction of reproductive organ.

Key words: nitrate nitrogen, ammonium nitrogen, foxtail millet, morphology, biomass