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Dynamics of Iron Fractions in the LTFE’s Soils
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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 sorghum at instructional farm, Junagadh Agril. University, Junagadh during the year 1979-80 (1st year), 1989-90 (10th year) and 1999-2000 (20th year) after completion of crop cycle. The selected treatments were T1-Control, T2-FYM @ 25 t/ha at an interval of 3 years, T3-½ RD of NP, T4-1/2 RD of NP+K, T5-RD of NP and T6-RD of NP+K to respective crops. On a long run, after 20th year the values of water soluble-Fe were recorded highest in T2 (0.722 ppm) and T1 (0.504 ppm) and the lowest in T5 (0.082 ppm) and T3 (0.130 ppm). The significantly highest exchangeable-Fe was recorded in T5 (2.084 ppm), at 10th year. The DTPA available and reducible Fe was found significantly higher under T1 and T2, while application of fertilizer registered mostly a decline in long term at 20th year. The total and residual-Fe content did not showed any significant differences either through treatment or through years. The percentage availability and available total-Fe were not affected significantly in pooled years, but Y x T interaction was found significant and in the initial years T5 and T6, while in the 20th years T1 and T2 recorded the highest values.
Keywords
LTFE’s Soil, Fe Fraction, Water Soluble-Fe, Exchangeable-Fe, DTPA Available-Fe, Total-Fe, Per cent Available-Fe.
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