Effects of Different Atmospheric CO2 Concentrations on Radish Growth and Nitrogen,Phosphorus and Potassium Nutrient Uptake
[Objective]It aimed to investigate whether elevated CO2 concentration affects radish growth and nutrient uptake by altering soil nutrients,and to provide theoretical references for rational fertilization of radish under elevated atmospheric CO2 concentration.[Method]Radish cultivar'Tangjing'was used as the experimental material.Four CO2 concentration levels including C0(atmospheric CO2 concentration),C1(C0+33%C0),C2(C0+67%C0)and C3(C0+100%C0)were set to study the effects of different CO2 concentrations on radish growth and nitrogen,phosphorus and potassium nutrient uptake.[Result]Compared with C0,the aboveground biomass increased by 0.52%—34.68%,the underground biomass increased by 63.00%—100.46%,and the total biomass increased by 37.83%—67.61%under C1,C2 and C3 treatment,which promoted the growth and dry matter accumulation of radish,and C2 was the most suitable treatment.Although increasing CO2 concentration reduced the concentration of underground nitrogen and phosphorus and aboveground potassium in radish,the accumulation of nitrogen,phosphorus and potassium in plants increased by 39.77%—43.30%,2.08%—17.27%and 38.38%—72.26%,respectively.In addition,soil nitrate nitrogen,available phosphorus and available potassium were decreased by 29.62%—34.20%,10.03%—14.12%and 1.92%—16.62%respectively as the CO2 concentration elevated.The accumulation of nitrogen and potassium in plants were positively correlated with plant dry weight,and negatively correlated with soil nitrate nitrogen,available phosphorus and available potassium.[Conclusion]Elevated CO2 improved soil fertility by increasing urease and phosphatase activities,and promoted the absorption of nitrogen,phosphorus and potassium nutrients,thereby increasing yield.Under the condition of elevated CO2 concentration,it is reasonable that increaing the application of nitrogen fertilizer,phosphorus fertilizer,potassium fertilizer,and the amount of nitrogen fertilizer should be greater than that of phosphorus fertilizer and potassium fertilizer.
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