Critical Limit of Sulphur for Mustard in Alfisols and Ultisols of Jharkhand

A green house experiment was carried out with surface soil samples (0-15 cm) collected in bulk from twenty different sites from plateau region of Jharkhand comprising the districts of Dhanbad, Giridih, Hazaribagh and Ranchi. Mustard was taken as a test crop. The dry matter yield and per cent relative yield were taken. To determine the critical limit of available S in soil for mustard using different extractants. The critical limit of available S for different extractants for mustard were 6.6 mg kg^-1(0.001 M HCl), 17.2 mg kg^-1(0.25 M HCl), 9.8 mg kg^-1(NaOAc+CH₃COOH), 10.2 mg kg^-1(Water soluble), 15.6 mg kg^-1(NH₄OAc+CH₃COOH), 15.6 mg kg^-1(0.15% CaCl₂), 13.2 mg kg^-1(1% NaCl ), 18.2 mg kg^-1(Heat soluble), 38.6 mg kg^-1(CaH₂PO₄), 48.8 mg kg^-1(KH₂PO₄).