Srivastava, AnjanaSarkar, Subrata2018-12-272018-12-272008-06http://krishikosh.egranth.ac.in/handle/1/5810086439Fantac(N-ATCA) is a synthetic biostimulant which is a mixture of 5% N-acetyl thiazolidine 4-carboxylic acid and 0.1% Folic acid.It enhances plant metabolism and grants a better response under stressing conditions.Alaboratory study wsa undertaken to examine UV spectra of N-acetyl thiazolidine 4-carboxylic acid(N-ATCA) in 0.005%CaCl2 and to investigate the adsorption behavior of (N-ATCA) on Ca 􀂲kaolinite Ca-bentonite.The adsorbance of 5 mg (N-ATCA) solution in water and 0.005M CaCl2 decreased with the increasing wavelength in the range of 200 to 300 nm.The wavelength at which the adsorbance was least affected by the presence of electrolyte was found to be at 210 nm.. The adsorption kinetics of N-ATCA on both the soil clays occurred in two phases, an initial faster and later slower rate. Each adsorption phase followed the first order kinetics. The computed values of the initial adsorption rate coefficient (k1) were 0.0085 for Ca-kaolinite and 0.02 for Ca-bentonite.Similarly,the values of later slower adsorption rate coefficient s(k2) were 0.0003 for Ca-kaolinite and 0.0017 for Cabentonite. The values of adsorption maximum (Xm) were found to be 416.67mg kg-1 for Ca-kaolinite and 769.23 mg kg-1 for Ca-bentoniteennullThesis