An Asian Journal of Soil Science

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Dynamics of Copper Fractions in the LTFE's Soils


Affiliations
1 Department of Agricultural Chemistry and Soil Science, Junagadh Agricultural University, Junagadh (Gujarat), India
2 Krishi Vigyan Kendra, Junagadhh Agricultural University, Jamnagar (Gujarat), India
     

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The dynamics of Cu fractions in the selective treatments were studied by collecting the surface soil samples (0-15 cm) from the L TFE’s conducted on groundnut-wheat-fodder sorghum at Instructional Farm, Junagadh Agril.University, Junagadh during the year 1979-80 (15t 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. The water soluble-Cu varied significantly in pooled results and the highest values were recorded in T5 (0.119 ppm) followed by T4 (0.115 ppm). Exchangeable form of Cu did not differ significantly during individual years and in pooled results. The RD of fertilizers + potassium (T6) recorded the highest value of DTP A-Cu at initial and 10th year and triggering utilization in long run rendering lower value at 20th year. Reducible-Cu was not affected significantly in pooled results, but untreated control (T1) recorded the highest value (0.269 ppm) at 20th year. Total and residual form of Cu content remain unaffected by different treatments during individual years and in pooled results, however, there was distinct numerical reduction in total and residual form of Cu over the year. Application of fertilizers enhanced utilization of available total-Cu, while conversion of total to available form and under utilization in T1 (1.907 ppm) and T2 (1.947 ppm) resulted in higher values after 20th year. The per cent availability of Cu content increased from initial to 20th year crop cycles in untreated control (T1) and FYM (T2) treatments.

Keywords

LTFE’s Soil, Cu Fraction, Water Soluble-Cu, Exchangeable-Cu, DTPA Available-Cu, Total-Cu, Per cent Available-Cu.
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  • Dynamics of Copper Fractions in the LTFE's Soils

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Authors

A. V. Rajani
Department of Agricultural Chemistry and Soil Science, Junagadh Agricultural University, Junagadh (Gujarat), India
J. N. Naria
Krishi Vigyan Kendra, Junagadhh Agricultural University, Jamnagar (Gujarat), India
J. V. Polara
Department of Agricultural Chemistry and Soil Science, Junagadh Agricultural University, Junagadh (Gujarat), India
B. A. Golakiya
Department of Agricultural Chemistry and Soil Science, Junagadh Agricultural University, Junagadh (Gujarat), India

Abstract


The dynamics of Cu fractions in the selective treatments were studied by collecting the surface soil samples (0-15 cm) from the L TFE’s conducted on groundnut-wheat-fodder sorghum at Instructional Farm, Junagadh Agril.University, Junagadh during the year 1979-80 (15t 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. The water soluble-Cu varied significantly in pooled results and the highest values were recorded in T5 (0.119 ppm) followed by T4 (0.115 ppm). Exchangeable form of Cu did not differ significantly during individual years and in pooled results. The RD of fertilizers + potassium (T6) recorded the highest value of DTP A-Cu at initial and 10th year and triggering utilization in long run rendering lower value at 20th year. Reducible-Cu was not affected significantly in pooled results, but untreated control (T1) recorded the highest value (0.269 ppm) at 20th year. Total and residual form of Cu content remain unaffected by different treatments during individual years and in pooled results, however, there was distinct numerical reduction in total and residual form of Cu over the year. Application of fertilizers enhanced utilization of available total-Cu, while conversion of total to available form and under utilization in T1 (1.907 ppm) and T2 (1.947 ppm) resulted in higher values after 20th year. The per cent availability of Cu content increased from initial to 20th year crop cycles in untreated control (T1) and FYM (T2) treatments.

Keywords


LTFE’s Soil, Cu Fraction, Water Soluble-Cu, Exchangeable-Cu, DTPA Available-Cu, Total-Cu, Per cent Available-Cu.