Effects of CO2 concentration enrichment, nitrogen and water on soil nutrient content and nutrient uptake of spring wheat

The study presented the effects of two atmospheric CO2 concentrations (350 and 700 mol/mol), two levels of soil moisture (wet and drought) and five rates of nitrogen fertilizer ( N 0,50,100,150,200 mgkg-1) on soil available nutriet content and nutrient uptake of spring wheat (Triticum aestivum L cv. Dingxi No. 8654). Results showed that high CO2 concentration significantly reduced N uptake of wheat, especially in low N treatment, but had little effect on P and K uptake of wheat. N, P and K uptake by wheat were significantly lower in well-watered treatments compared with in drought treatments. The effects of CO2 increased on soil available N depended on soil water status. In well-watered treatment, soil available N content was lower in the enriched CO2 treatment compared with in the ambient CO2 treatment, while in drought treatment, soil available N content was greater applied with N 50, 100, 150 mgkg-1. High CO2 concentration had little effect on soil available P and K content, but soil available P and K content were significantly greater at low N supply and insufficient water condition than at adequate N and water under adequate P and K supply.