Dynamics of iron fractions in calcareous Vertic ustochrepts under AICRP-LTFE soils

The dynamics of Fe fractions in the selective treatments were studied by collecting the surface soil samples (0-15 cm) from the LTFE’s conducted on groundnut-wheat-fodder at Instructional Farm, Junagadh Agricultural University, Junagadh during the year 1999 – (Initial soil), 2002-03 (4th year), 2006-07 (8th year) after completion of crop cycle. In a long run after 8th year the significant values were recorded in T9 followed by T4, T10 and T11. Exchangeable Fe content did not showed any significant differences either through treatments or through years. The DTPA available and reducible Fe was significant when pooled over year and also Y x T interaction was significant. Total and residual-Fe content showed significant change, when pooled over the year and Y x T interaction was also significant. Highest value was recorded under application of FYM @ 25 t/ha to G’nut. Overall mean value was depleted on long term basis. The percentage availability and available total-Fe were also exhibited more or less same trend but in available total Y x T interaction was not significant.