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Aim <p>Phosphorus (P) management in acid soils is crucial for improving crop productivity, however, the fate of different P fractions in response to various P sources and amendments is not fully understood. This study evaluated the impact of continuous P fertilization using different P sources on the distribution of P-fractions in an acid soil under wheat cultivation in Palampur, Himachal Pradesh, India.</p> Method <p>Over a two-year period, nine treatments, including chemical fertilizers, lime, farmyard manure (FYM), and phosphate-rich organic manure (PROM), were tested. Soil P-balance, relationship of crop yield and available P with soil P fractions were also worked out. Sequential P fractionation revealed significant changes in the distribution of inorganic (Pi) and organic phosphorus (Po) fractions.</p> Results <p>The highest increase in labile fraction (H<sub>2</sub>O-P and NaHCO<sub>3</sub>-P) was observed in T<sub>8</sub> treatment receiving integrated applications of PROM and chemical fertilizers, with the H<sub>2</sub>O-P and NaHCO<sub>3</sub>-Pi content increasing by up to 69.4 and 124% compared to the control, respectively. The NaOH-extractable Pi fraction, a dominant P pool primarily associated with Fe and Al oxides, was also significantly affected by different treatments. Residual-P was the largest fraction across all treatments, reflecting the cumulative buildup of stable P forms. Except for the natural farming treatment (T<sub>5</sub>), all other treatments were recorded with a positive P balance. Grain and straw yield showed a substantial correlation with NaHCO<sub>3</sub>-Pi, NaHCO<sub>3</sub>-P<sub>0</sub>, NaOH-Po. Available P showed a significant correlation with all P forms, except with HCl-P form.</p> Conclusion <p>The study demonstrates that integrating organic amendments with chemical fertilizers can significantly enhance the availability of various P fractions in acid soils, potentially improving P-use efficiency and long-term soil fertility.</p>

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Soil Phosphorus Fractions and Balance in Response to Integrated Phosphorus Management in an Acid Alfisol of North West Himalayas

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Dhanbir Singh,
  • Rewangini Ranjha,
  • Sanjay K. Sharma,
  • Prakriti Kaistha,
  • Varun Parmar

摘要

Aim

Phosphorus (P) management in acid soils is crucial for improving crop productivity, however, the fate of different P fractions in response to various P sources and amendments is not fully understood. This study evaluated the impact of continuous P fertilization using different P sources on the distribution of P-fractions in an acid soil under wheat cultivation in Palampur, Himachal Pradesh, India.

Method

Over a two-year period, nine treatments, including chemical fertilizers, lime, farmyard manure (FYM), and phosphate-rich organic manure (PROM), were tested. Soil P-balance, relationship of crop yield and available P with soil P fractions were also worked out. Sequential P fractionation revealed significant changes in the distribution of inorganic (Pi) and organic phosphorus (Po) fractions.

Results

The highest increase in labile fraction (H2O-P and NaHCO3-P) was observed in T8 treatment receiving integrated applications of PROM and chemical fertilizers, with the H2O-P and NaHCO3-Pi content increasing by up to 69.4 and 124% compared to the control, respectively. The NaOH-extractable Pi fraction, a dominant P pool primarily associated with Fe and Al oxides, was also significantly affected by different treatments. Residual-P was the largest fraction across all treatments, reflecting the cumulative buildup of stable P forms. Except for the natural farming treatment (T5), all other treatments were recorded with a positive P balance. Grain and straw yield showed a substantial correlation with NaHCO3-Pi, NaHCO3-P0, NaOH-Po. Available P showed a significant correlation with all P forms, except with HCl-P form.

Conclusion

The study demonstrates that integrating organic amendments with chemical fertilizers can significantly enhance the availability of various P fractions in acid soils, potentially improving P-use efficiency and long-term soil fertility.