Effects of Ratio Fertilization on Growth and Photosynthetic Characteristics of Ailanthus altissima'Liaohong'Seedlings
In order to explore the effects of nitrogen,phosphorus and potassium ratio fertilization on the growth and photosynthetic characteristics of Ailanthus altissima'Liaohong'seedlings,one-year-old A ilanthus altissima'Liaohong'seedlings were used as experimental materials,and L16(43)orthogonal design was used for pot experiment,aiming to provide reference for scientific fertilization of Ailanthus altissima'Liaohong'seedlings.The results showed that the growth index,quality index,chlorophyll content,net photosynthetic rate(Pn),stomatal conductance(Gs)and intercellular CO2 concentration(Ci)of T9 group were the maximum values in each treatment group,and the transpiration rate(Tr)of T7 group was the maximum value in each treatment group.Nitrogen fertilizer had a very significant effect on the growth index and photosynthetic index of seedlings,and had a significant effect on the quality index of seedlings.Potassium fertilizer had a very significant effect on net photosynthetic rate,stomatal conductance and intercellular CO2 concentration,and had a significant effect on leaf area,underground biomass,total chlorophyll content and chlorophyll a content.Phosphorus fertilizer had significant effects on leaf area,stomatal conductance and transpiration rate.The effects of nitrogen,phosphorus and potassium on plant height,ground diameter,leaf area,aboveground biomass,total biomass,mass index,total chlorophyll,chlorophyll a content,net photosynthetic rate,stomatal conductance and intercellular CO2 concentration were N＞K＞P,the effects on chlorophyll b content and transpiration rate were N＞P＞K,and the effects on underground biomass were K＞N＞P.According to the analysis of the membership function,the T9 group(nitrogen fertilizer 6 g/plant,phosphate fertilizer 3 g/plant,potassium fertilizer 4.5 g/plant)was the best fertilization scheme.
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