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Phosphorus Availability in a Calcareous Soil After High Loading Rates of Animal Manure
Author(s) -
Meek B. D.,
Graham L. E.,
Donovan T. J.,
Mayberry K. S.
Publication year - 1979
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/sssaj1979.03615995004300040024x
Subject(s) - calcareous , manure , phosphorus , zoology , chemistry , sowing , agronomy , environmental science , biology , botany , organic chemistry
The fixing of phosphorus (P) added to calcareous soils is rapid but can be reduced by applying organic sources. The objectives of this study were to measure in the field the residual NaHCO 3 ‐extractable P resulting from manure applications at high rates and to contrast the NaHCO 3 ‐extractable P levels for manure vs. inorganic P fertilizers. When inorganic P was applied at 490 kg/ha for each of 2 years the NaHCO 3 ‐extractable P was increased from 16 to 31 ppm at the 0‐ to 30‐cm depth. The application of 98 kg/ha of P as triple superphosphate each of 2 years applied just before planting lettuce (September‐October) was as effective for increasing NaHCO 3 ‐extractable P during the lettuce‐growing season (November 1976) as applying 490 kg/ha of P in May or June each of 2 years. High rates of P (5,344 kg/ha) applied from manure sources (treatment 720E) resulted in high levels of NaHCO 3 ‐extractable P up to 377 ppm. Total application of more than 360 metric tons/ha of manure (2,672 kg P/ha) resulted in movement of P to the 30‐ to 60‐cm depth. The increased level of NaHCO 3 ‐extractable P from a manure application (treatment 360B) was still evident in the 0‐ to 30‐cm depth 6 years after manure application had ceased. The application of 392 kg P/ha as triple superphosphate for each of 2 years increased the NaHCO 3 ‐extractable P over the check by 11 ppm (November 1976). In contrast, the application of 334 kg P/ha from applied manure (treatment 180B) each of 2 years increased the NaHCO 3 ‐extractable P over the check (after harvest in 1972) by 100 ppm.