Regulation Of Nitrogen And Phosphorus Application On Root Architecture And Absorption Of Summer Maize

Research under the condition of different frtilization in the summer of the change of the maize root system characteristics,discusses the influence of fertilization and root conformation and absorbing performance,and to provide evidence for corn high yield cultivation measures.This test by sea to test 605 varieties,through soil column experiment,the different fertilizer levels on root conformation and absorbing performance,the influence of the main results were as follows:1.The impact on the yield and dry matter accumulationWith the increase of n application,upper dry matter accumulation and yield of summer corn was significantly increased trend of summer maize dry matter accumulation and grain yield of n has a significant influence,under this experimental condition,N3 is 375 kg hm-2 n application rate on dry matter accumulation and yield is the largest.Under the same nitrogen level,with the increase of phosphorus content,summer maize dry matter accumulation and grain yield were significantly increased trend,significant analysis also showed that phosphorus removal of summer corn dry matter accumulation and grain yield significantly affected.2.The influence of the characteristics of root systemThis study found that summer corn stage,the flowering period rootshoot ratio decreased significantly,under the same phosphorus level,with the increase of nitrogen,summer corn root cap ratio gradually reduce,dry matter gradually shifted to the ground.Under the same nitrogen level,with the increase of phosphate fertilization,summer maize root morphology index(including root length,root surface area,root volume,root dry weight,root number)were significantly increased trend,in the full ripeness period,under the same nitrogen level,with the increase of phosphorus removal,summer corn root cap ratio is slightly lower,but the difference was not significant.3.Influence on nitrogen and phosphorus uptake efficiencyUnder the same nitrogen level,increasing phosphate fertilizer application,can effectively increase the n uptake efficiency and n partial productivity,can significantly improve the efficiency of phosphorus,partial productivity and utilization efficiency of agriculture.Under the same phosphorus level,increasing nitrogen application,can effectively improve the efficiency of phosphorus,harvest index and partial productivity;N2 levels of nitrogen absorption efficiency,harvest index and partial productivity and agronomy efficiency slightly lower than N1 level,but N3 level n uptake increased significantly,the indicators in this experimental conditions,nitrogen and phosphorus with can significantly improve the summer corn on the absorption of nitrogen and phosphorus removal efficiency,deal with best N3P3.