Studies on the Status and Distribution of Sulphur in Black Soils (Vertisols) of Karimnagar District, Andhra Pradesh

The black soils of Karimnagar used for the study were non-saline clay to sandy loams and calcareous. The available nitrogen was low (137.98 to 217.2 kg ha⁻¹). P,0 content was medium to high (4.6 to 60.0 kg ha⁻¹) and K₂O varied from 185.2 to 360.0 kg ha⁻¹. The total sulphur content of Karimnagar District black soils (Vertisols) ranged from 117.0 to 406.0 ppm. It showed positive and significant correlation with clay (r = 0.54) and negative significant with sand (r = -0.39) and highly positive significant correlation with organic + non-SO₄-S (r = 0.99” and r = 0.98**). Organic + non-SO₄-S content were ranged from 95.0 to 380.87 ppm and showed positive significant correlation with clay (r = 0.57**) and highly positive significant relation with total - S (r = 0.99 and r = 0.98**). Inorganic sulphur ranged from 11.0 to 26.0 ppm. 500 ppm KH₂PO₄ inorganic sulphur had negative significant correlation with E.C. (r = -0.39) and positive and significant with clay (r = 0.46). 0.15 per cent CaCl₂ extractable sulphur had a high significant positive correlation with (r = 0.96**) 500 ppm KH₂PO₄ extractant and significant positive correlation with Organic + non-SO₄-S (r=0.51**) and total - S (r = 0.55**).