Effects of Foliar Application of Carbon Nanosol on Growth of Potted Tobacco Seedlings
To explore the effects of carbon nanosol on potted tobacco seedlings through foliar application,five mass concentrations[0(CK),10,40,70,and 100µg/mL]were employed in this experiment.Several growth parameters were measured,including the maximum leaf length and width,fresh weight,photosynthesis,plastid pigments,leaf nitrate reductase activity,root morphology and characteristics of tobacco seedlings,as well as the absorption of nitrogen,phosphorus,and potassium nutrients.The results indicated that carbon nanosol promoted the length extension of leaves,but had little effect on the width within the concentration range from 40 µg/mL to 100 µg/mL.At the concentration of 40 µg/mL and 70 µg/mL,significant differences in fresh weight were observed in aboveground part between the treated and control groups.The net photosynthetic rate(Pn),transpiration rate(Tr)and stomatal conductivity(Gs)of tobacco seedlings initially increased and then decreased with the concentration rising of carbon nanosol,with the most significant differences occurring at 40 µg/mL and 70 µg/mL.The contents of pigment chlorophyll and carotenoid in leaves increased with higher carbon nanosol concentration,and there were significant differences of pigment contents between the 40 µg/mL,100 µg/mL treatment groups and the control group.The nitrate reductase activity of 40,70,100µg/mL treatments was significantly higher than that of control group,and nitrate reductase activity of 40µg/mL treatment reached the maximum value.Foliar application of 40 µg/mL and 70 µg/mL carbon nanosol had positive effects on the root average diameter,surface area,volume and tip number.The treatments of 40µg/mL and 70µg/mL significantly promoted the absorption of nitrogen,phosphorus,and potassium nutrients by the seedlings.In conclusion,foliar application of carbon nanosol at concentration of 40-70µg/mL is most beneficial for promoting the growth of potted tobacco seedlings.
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