The Effects of Different Fertilization Treatments on Growth Characteristics of Dalbergia cochinchinensis
To reveal the effects of nitrogen,phosphorus and potassium(NPK)formula fertilization on the growth and root development of Dalbergia cochinchinensis,the optimal formula for NPK fertilization was select-ed to provide technical support for the seedling breeding of D.cochinchinensis.Using 1-year-old D.cochinchinensis seedlings as materials,3414 orthogonal experimental design was used to study effects of dif-ferent fertilization treatments on growth and root morphology characteristics of D.cochinchinensis seedlings.There were highly significant or significant differences in the effects of nitrogen,phosphorus,and potassium fertilizers on seedling height,stem,leaf,and total biomass.However,there was an insignificant difference in their effects on the main root length,root surface area,and number of primary lateral roots.There were highly significant or significant differences in the effects of nitrogen and phosphorus fertilizers on ground diameter,root diameter,leaf area,and root biomass.The influences of phosphorus on seedling height,ground diameter,stem and leaf biomass,leaf area,main root length,root surface area,and number of primary lateral roots were greater than that of nitrogen and potassium.The influences of phosphorus on seedling height,ground diam-eter,stem and leaf biomass,leaf area,main root length,root surface area,and number of primary lateral roots were greater than those of nitrogen and potassium.The influences of phosphorus and nitrogen on height-to-diameter ratio and root diameter were equivalent,which were greater than those of potassium.The impacts of nitrogen on root biomass and total biomass were greater than those of phosphorus and potassium.According to the result of principal component analysis and comprehensive quality evaluation,the treatment of T6(N2P2K2),T7(N2P3K2),T10(N2P2K3),and T11(N2P3K2)were all suitable fertilization combinations for the growth of D.cochinchinensis seedlings.The growth of D.cochinchinensis seedlings could be promote by fertilization with nitrogen,phosphorus and potassium.The optimum fertilization formula for the growth of D.cochinchinensis seedlings is N2P3K2(300 mg N per plant,80 mg P per plant and 70 mg K per plant).The growth and root development of D.cochinchinensis seedlings was the best with a high level of N application and a moderate level of P and K application.
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