不同氮素形态及配比对水培生菜铁营养的影响

研究了硝态氮与 态氮及其不同配比对水培生菜铁素营养的影响。结果表明，不同形态氮素显著影响植物的铁素营养状况，ＮＯ＾－３－Ｎ：ＮＨ＾＋Ｒ－Ｎ为９：３和６：６ｍｅ／Ｌ的处理，较单一ＮＯ＾－３－Ｎ处理，能促进水增生菜生长，提高叶绿素含量，增加植物体内铁的活性，降低叶片中硝酸盐的积累，降低营养液成本。

Influence of N Forms and NO-3-N/NH+4-N Ratio on Iron Nutrition in Hydroponically Grown Lettuce

The effect of N forms and NO-3-N/NH+4-N ratio on iron nutrition in hydroponicallygrown lettuce were investigated.It was found that suitable NO-3-N/NH+4-N ratio(9:3,6:6me/L) in nutrient solution can significantly promote plant growth, raise chlorophyll content,improve plant iron utilization efficiency , and reduces nitrate accumulation in leaves,and the costof nutrient solution was thus reduced. The role of iron in N metabolism was also analysed. Withthe increase of iron supplemented to the nutrient solution ,the activity of nitrate reductaseincreased and the accumulation of nitrate in leaves reduced.