Effects of different ratios of nitrogen,phosphorus,and potassium fertilization on the growth and leaf nutrient content of Cypomandra Betacea seedlings
To investigate the effects of different ratios of nitrogen(N),phosphorus(P),and potassium(K)fertilization on the growth and leaf nutrient content of Cypomandra betacea seedlings,taking 1-year-old Cypomandra betacea seedlings as the object,an orthogonal experimental design L9(34)of three factors and three levels of nitrogen was adopted,and no fertilization was used as the control group(CK).The effects of different ratios of N,P and K fertilization on the growth and leaf nutrient content of Cypomandra betacea seedlings were determined and analyzed.The results showed that under different fertilization ratios of N,P and K,the accumulation of biomass in the roots,stems and leaves of Cypomandra betacea seedlings was significantly increased,and the distribution of biomass in each organ showed as root＞leaf＞stem.The nutrient accumulation in the leaves of Cypomandra betacea seedlings was N＞K＞P,and the optimal treatments for leaf N and K were A3B2C1 and A2B2C3 treatments,in which 6 g/plant nitrogen and 6 g/plant potassium were added,respectively.The plants of CK group were limited by N because of nitrogen phosphorus ratio＜14.The content of photosynthetic pigments,soluble sugars and starch were the best in A1B3C3 treatment,the activity of soluble proteins and SOD was the best in A2B2C3 treatment,the activity of POD was the best in A2B3C1 treatment,and the MDA content was the lowest in A2B1C2 treatment,which had the best protective effect on Cypomandra betacea seedlings from damage.Correlation analysis showed that there was a significant positive correlation(P＜0.01)between the biomass,leaf traits,photosynthetic pigments,nitrogen,phosphorus,potassium,NSC,protective enzymes and MDA of tomato seedlings under different fertilization treatments.According to principal component analysis,the cumulative contribution rate of each indicator reached 79.69％,and the comprehensive evaluation of fuzzy membership function showed that A1B3C3 treatment had the best effect on the growth of tree tomato seedlings.According to the comprehensive experimental results,the growth indicators,leaf nutrient content,photosynthetic pigments,protective enzymes and MDA content of Cypomandra betacea seedlings were determined.The optimal fertilization ratio was A1B3C3 treatment,which applied 2.0 g/plant urea,6.0 g/plant superphosphate,and 6.0 g/plant potassium sulfate.
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