, Volume 155-156, Issue 1, pp 231-234

Nitrogen and phosphorus requirements of cotton and wheat under changing atmospheric CO2 concentrations

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The influence of increasing atmospheric CO2 on shoot growth, leaf nitrogen and phosphorus concentrations and carbohydrate composition was investigated in cotton and wheat. Shoot dry weight of both species was generally higher at elevated CO2, especially at high rates of available soil N and P. Critical leaf N concentration was reduced but critical P concentration was increased in both species at high CO2.