Abstract

                                Field experiments were conducted using Typic Chromusterts (Black calcareous soil) and Typic Haplustalf (Red non-calcareous soil) with sorghum var: TNS.27 as the test crop to com- pare the organic sources of iron with that of the inorganic iron sources. In black calcareous soil (S) the treatment FYM 10t+ pyrite 700 kg/ha was found to be superior and: recorded 4.8 ppm DTPA extractable Fo The available Fe in soil was higher at 30th day and decreased thereafter (60th day and harvest stage) due to the age of the crop. In addition to the above field experiments an incubation experiment was also conducted using the same soils (black calcareous and red-non calcareous soil) with same set of treatments to study the changes in DTPA extractable Fe status in soil for the period of 60 days under laboratory condition. This study revealed that availability of Fe content was increasing upto 45th day and decreased thereafter.

Key words : Soil, Black calcareous, Red non-calcareous, Iron content