Effects of different substrate ratios on physiological characteristics of Ormosia xylocarpa container seedlings
[Objective]The matrix formula suitable for container seedling growth of Ormosia xylocarpa was screened to provide reference for cultivating high-quality container seedling of O.xylocarpa.[Method]A single factor completely randomized block design was used.Peat,coconut chaff,perlite,vermiculite and pond mud were used as matrix materials,and 7 kinds of substrates were configured according to the volume ratio to carry out container seedling raising test on O.xylocarpa.The physical and chemical properties of different matrix ratios were determined,and the effects of different matrix ratios on the growth and physiological indexes of O.xylocarpa container seedlings were analyzed.The membership function was used to comprehensively evaluate the quality of seedlings.[Result]The physical and chemical properties of different substrate ratios were significantly different.The bulk density of the 7 groups of substrates ranged from 0.14 to 0.44 g·cm-3,among which the bulk density of the T6 treatment was the largest and the T3 treatment was the smallest.The alkali-hydrolyzable nitrogen content of T6 treatment was the highest,which was 276.75 mg·kg-1.There were significant differences in the growth of O.xylocarpa container seedlings cultivated with different ratios of substrates.The seedling height,ground diameter,root growth,biomass,nitrate nitrogen,chlorophyll content and photosynthetic parameters of O.xylocarpa container seedlings treated with T6 were the best,followed by T5.Correlation analysis showed that substrate bulk density and alkali-hydrolyzable nitrogen were significantly positively correlated with seedling height,ground diameter,underground biomass and nitrate nitrogen(P＜0.05).The comprehensive evaluation of the membership function of 14 indexes such as the growth and physiology of the container seedlings of O.xylocarpa showed that the membership function value of T6 ranked the first.[Conclusion]T6(peat∶vermiculite∶pond mud=1∶1∶1)matrix formula has large bulk density,good cohesiveness,and good water and fertilizer retention capacity;its high nitrogen content is conducive to the synthesis of chlorophyll and photosynthetic enzymes,and enhances photosynthetic capacity.Therefore,it is an ideal substrate for cultivating the container seedling of O.xylocarpa.
NETL
NSTL
万方数据
