Research progress on effect of nitrogen form on plant growth.

Ammonium and nitrate,as the main inorganic nitrogen forms absorbed from the soil,had different effects on morphological and physiological processes in higher plants. This paper reviewed the mechanism of different nitrogen forms absorption and utilization in plants, how nitrogen form regulating nutrient uptake, root system development,photosynthesis physiology, yield and quality formation, and nitrogen transporter protein genes expression etc.. The paper also elaborated the mechanism of nitrogen forms regulating plant growth,and put forward problems needed to be clarified in studying nitrogen form.