Effect of rhizobia on seedling growth of Falcataria falcata
An attempt was made to analyze the effect of rhizobia on seedling growth of Falcataria falcata,which could provide scientific basis for the application of rhizobia in seedling cultivation of F.falcata.A rhizobium strain ZS530-8 isolated and purified was used as an inoculant,and an inoculation and nutrient application comparative trial was made in different culture substrates.Seedling height and ground diameter were regularly measured to analyze the differences in seedling growth dynamics and growth effects in different treatments.From planting to 30 d,the seedlings of F.falcata grew normally in different treatments,and the difference in seedling height was only observed in the different culture substrates.The growth rate of seedling height and ground diameter of the inoculated seedlings gradually increased from 30 d to 60 d,and the growth peak occurred from 60 d to 90 d,showing a trend of steady and then accelerated growth.The seedlings treated with nutrients maintained a trend of continuous growth at a certain rate,while the control failed to grow normally after 60 d.At 90 d,the height and ground diameter of inoculated seedlings were 8.18-10.10 cm and 1.67-2.14 mm,which were 3.2％-9.4％and 16.0％-33.8％higher than those of the nutrient treated seedlings in the corresponding substrates,respectively.The ground diameter of the quartz sand+rhizobia treatment was consistently better than that of the vermiculite+rhizobia treatment,and the difference reached a highly significant level(P＜0.001).Rhizobia provide nitrogen-based essential nutrient elements for the growth of the seedlings of F.falcata,and have a significant effect on the growth of the seedlings,especially the growth of seedling ground diameter,and their growth-promoting effect is enhanced with the growth of the seedlings.The culture substrates with stable,loose and well-aerated texture and pH neutral acid are more conducive to growth-promoting of rhizobia.
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