Multi-factors Fertilization Trial of Tectona grandis in Seedling Stage

The trial,designed by orthogonal design with a L8(41×24) of N,P,K,Mg and Zeolite(Z) for 2,4,2,2,2 levels respectively,was to research the effects of different fertilizer treatments on the growth and dry biomass of seedlings of Tectona grandis.The results of variance analysis of fertilizer trial of Tectona grandis in seedling stage showed that there were high significant difference among different fertilizer treatments on the growths and dry biomass in 7 months,treatment 5(P12N1K1Mg2) of which was the best treatment among 8 fertilizer treatments on growth and each dry biomass,and had high significant or significant difference with other 7 fertilizer treatments.Compared with the contrast(no fertilizer treatment),treatment 5 on seedling height,ground diameter,total dry biomass,root dry biomass,stem dry biomass and leaf dry biomass at 7 months were 3.58,2.74,11.78,11.29,10.24,17.79 and 8.15 times that of the contrast respectively.Zeolite can promote the growth of seedling stock of T.grandis and the formation of biomass of each organ.Treatments with zeolite on seedling height,ground diameter,total dry biomass,root dry biomass, stem dry biomass and leaf dry biomass at 7 months were 2.10,1.69,4.02,3.17,2.94 and 2.60 times that of treatments without zeolite.There are also high significant differences on growths and dry biomass of seedlings among different P levels,the low P levels of which were superior to the high P levels on growths and dry biomasses of seedlings.The best application of P fertilizer in containerized seedling stock culture was 0.7% of weight of medium.Treatment added Mg could also promote the growth of seedling stocks and increase the biomass of seedling stocks.This trial will provided scientific references for field fertilizer application in the future.