Sand culture experiment was conducted in a glasshouse at Northwest Science and Technology University of Agriculture and Forestry using corn ( Zea mays ) and sunflower ( Helianthus annus ) as indicating crops to study the influence of N level on water consumption,N uptake,the membrane permeability,and root activity etc.Three N levels were used as treatments:(1) total Hoagland solution,(2) 1/3 N Hoagland solution,(3) 1/9 N Hoagland solution.The N amount in each nutrient solution was 12.6 mg/pot,4.2 mg/pot...
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