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Reactions and Availability of Banded Polyphosphate in Field Studies
Author(s) -
Miner Gordon,
Kamprath Eugene
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500060024x
Subject(s) - polyphosphate , phosphate , hydrolysis , chemistry , phosphate fertilizer , ion , fertilizer , inorganic chemistry , biochemistry , organic chemistry
The concentration of fertilizer P from both superphosphate and polyphosphate decreased rapidly with increasing lateral distance from the band. Aluminum phosphate and lesser amounts of Fe phosphates were the soil reaction products formed with essentially no difference between the two P materials. A higher proportion of the condensed phosphate ions were in the difficultly extractable form as compared with the orthophosphate ions, indicating that the condensed phosphate ions are held more strongly. The apparent hydrolysis of condensed phosphates increased with increasing lateral distance from the center of the band. Hydrolysis was greater in the Lynchburg, a low P‐fixing soil, than in the Georgeville, a high P‐fixing soil. Polyphosphate was as effective as superphosphate in supplying P for plant growth. The residual effectiveness of the polyphosphate was similar to that for superphosphate. Although condensed phosphate ions are held more strongly than orthophosphate by soil materials, there appears to be no difference in their effectiveness as sources of P for plants.