Responses of Root Characteristic Parameters and Plant Dry Matter Accumulation, Distribution and Transportation to Nitrogen Levels for Spring Maize in Northeast China

Improving nitrogen use efficiency is a significant scientific problem to be solved. Two maize hybrids JD27 (Jidan 27) and SD19 (Sidan 19) were selected study the effects of levels on root characteristic parameters plant dry matter accumulation, distribution transportation. We set five different levels, which deficiency (000N), low (075N), medium (150N), high (225N) excessive (300N). The results showed that length surface area significantly higher than those under 075N. With increase difference among varieties gradually decreased. length, projection area, total volume reached maximum values at silking stage. average diameter kept stable or decreased slowly with growth accumulation was all stages. Increasing amount fertilizer can promote transport grain improve after anthesis. Under treatment fertilizer, easy obtain yield, but inhibited yield. This provides theoretical practical guidance for production techniques.