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《Journal of Anhui Agricultural Sciences》 2009-01
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Effect of Concentration of NO3~--N on Root Vigor and Rhizosphere pH Value of Winter Wheat Seedlings

MEN Zhong-hua et al (Baotou Teachers College,Baotou,Inner Mongolia 014030)  
[Objective] The aim was to research the effect of concentration of NO3--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 NO3-and change of pH values under the different level of disposal,such as high(contain NO3--N 15.0 mmol/L),medium(contain NO3--N 7.5 mmol/L) and lower(contain NO3--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 NO3-,the changes of pH values and root vigor was obvious under the hydroponics condition.[Conclusion]Though NO3-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 NO3-that plants uptake and decrease of root activity,so it isn't useful to wheat young seedling to uptake nitrogen nutrition.
【Fund】: 国家自然科学基金重点资助项目(30230230);; 国家自然科学基金农业倾斜资助项目(30070429);; 内蒙古自治区高等学校科学研究项目(NJZY07120)
【CateGory Index】: S512.1
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