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

In a green house experiment 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, safflower 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 safflower using different extractants standerd statistical method was followed. The critical limit of available S for different extractants for safflower were 5.2 mg kg^-1(0.001 M HCl), 6.2 mg kg^-1(0.25 M HCl), 8.6 mg kg^-1(NaOAc+CH₃COOH), 10.4 mg kg^-1(Water soluble), 13.6 mg kg^-1(NH₄OAc+CH₃COOH), 16.2 mg kg^-1(0.15% CaCl₂), 16.8 mg kg^-1(1% NaCl), 19.6 mg kg^-1(Heat soluble), 38.2 mg kg^-1(CaH₂PO₄), 47.8 mg kg^-1(KH₂PO₄), respectively.