Effect of lanthanum and cerium on chlorophyll content in soybean efflorescence

Soybean Dongnong number 42 and 47 were used for experiment materials with planting in the pot. The effect of La³⁺ and Ce³⁺ among different concentrations (RE₁/60 mg·L^-1, RE₂/90 mg·L^-1, RE₃/120 mg·L^-1 and RE₄/150 mg·L^-1) on chlorophyll content in soybean flowering period was studied using ethanol spectrophotometer method. The results showed that compared with CK, La promoted two kinds soybean chlorophyll content (Chl) under low concentration and inhibited Chl content under high concentration: under RE₁ treatment, chlorophyll content is higher than CK and to be maximize, Along with the increasing concentration, promotion was to reduce, inhibition was obvious, Chl content was lower than CK under RE₂~RE₄ treatment; Ce reduced two kinds soybean chlorophyll content, and Chl content decreased most significantly under RE₁ treatment, and increased under RE₂~RE₄ treatment and was lower than CK.