Effect of foliar spraying of iron nanoparticles on the growth and quality of spinach
Using substrate cultivation,spinach variety Dabo 6 was used as the test material,and foliar spraying of nano-zero-valent iron(NZVI)at different concentrations(5,50,150,300 and 450 mg·L-1)was applied to study the effects of NZVI on the growth,photosynthetic characteristics and quality of spinach.The results showed that dif-ferent concentrations of NZVI treatments increased the biomass,photosynthesis and leaf soluble sugar and vitamin C content of spinach,and showed a tendency to increase and then decrease with the increase of iron nanoparticles con-centration;The largest increase was with 150 mg·L-1.Compared with CK,its dry and fresh weight increased by 75.73％and 49.44％,net photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr),in-creased by 48.39％,52.34％,and 52.38％,respectively,root vigor increased by 80.21％,and the content of sol-uble sugar and vitamin C increased by 42.34％and 25.60％,respectively.Different concentrations of NZVI treat-ments were could effect the content of nitrate and oxalic acid to different degrees,with the 150 mg·L-1 NZVI treat-ment showing the greatest reduction of 64.56％and 56.86％,respectively.
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