Effects of Concentration of NO_3^--N on Root Vigor and Rhizosphere pH of Winter Wheat Seedlings  

硝态氮浓度对冬小麦幼苗根系活力及根际pH值的影响(英文)

作　　者：门中华[1] 李生秀[2] 

机构地区：[1]包头师范学院,内蒙古包头014030 [2]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《Agricultural Science & Technology》2008年第5期24-26,30,共4页农业科学与技术（英文版）

基　　金：Supported by the Key Programfromthe National Natural Science Foundation of China(30230230);the National Natural Science Foundation Agricultural Program of China(30070429);Scientific Research Program for Universities in Inner Mongolia Autonomous Region(NJZY07120)~~

摘　　要：[Objective] The aim was to research the effect of concentration of NO-3-N on root vigor and rhizosphere pH of winter wheat seedlings under water culture.[Method]By selecting Hoagland's nutritional solution as cultural medium and winter wheat as material of experiment,on the basis,testing root vigor,nutrient solution NO-3 and change of pH values under the different level of disposal,such as high(containing NO-3-N 15 mmol/L),medium(containing NO-3-N 7.5 mmol/L)and lower(containing NO-3-N 2.5 mmol/L).[Result]The results of this research showed that the effect of different nitrogen level on the wastage of nutrient solution NO-3,the changes of pH values and root vigor is obvious under the hydroponics condition.[Conclusion]Though NO-3 is a safe nitrogen sources when it was supplied to plants too more,it would restrain assimilation on nitrate nitrogen farther,but when it was supplied to plants too little,it would lead to deficiency of NO-3 that plants uptake and decrease of root activity,so it isn't useful to wheat young seedling to absorb nitrogen nutrition.[Objective] The aim was to research the effect of concentration of NO-3-N on root vigor and rhizosphere pH of winter wheat seedlings under water culture.[Method]By selecting Hoagland's nutritional solution as cultural medium and winter wheat as material of experiment,on the basis,testing root vigor,nutrient solution NO-3 and change of pH values under the different level of disposal,such as high(containing NO-3-N 15 mmol/L),medium(containing NO-3-N 7.5 mmol/L)and lower(containing NO-3-N 2.5 mmol/L).[Result]The results of this research showed that the effect of different nitrogen level on the wastage of nutrient solution NO-3,the changes of pH values and root vigor is obvious under the hydroponics condition.[Conclusion]Though NO-3 is a safe nitrogen sources when it was supplied to plants too more,it would restrain assimilation on nitrate nitrogen farther,but when it was supplied to plants too little,it would lead to deficiency of NO-3 that plants uptake and decrease of root activity,so it isn't useful to wheat young seedling to absorb nitrogen nutrition.

关 键 词：NO-3-N WINTER wheat Water culture ROOT VIGOR RHIZOSPHERE pH 

分 类 号：S512.11[农业科学—作物学]