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a Effect of different concentrations of CS–NPK NPs on root growth and lateral root formation. Representative picture of pea seedlings grown for 7 days in the presence of different concentrations of CS–NPK nanoparticles. Seedlings were grown either a vertically in test tubes or b immersed horizontally in Petri dishes supplemented with the applied concentrations. Note the inhibition of lateral root formation at higher concentrations of 1 and 0.5 R
