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Nutrient leaching from clay soil monoliths with variable past manure inputs
Author(s) -
Ulén Barbro,
Eriksson Ann Kristin,
Etana Ararso
Publication year - 2013
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.201200412
Subject(s) - lysimeter , manure , topsoil , leaching (pedology) , environmental science , soil water , agronomy , environmental chemistry , slurry , chemistry , zoology , soil science , environmental engineering , biology
Overall, arable soils in Sweden are currently generally close to phosphorus (P) balance, but excessive P accumulation has occurred on animal fur farms, i.e., those rearing mink ( Mustela vison ) and foxes ( Alopex lagopus and Vulpes vulpes ). Manure P from these farms has sometimes regarded as sparingly soluble. Laboratory lysimeter topsoil trials with simulated rain demonstrated that potential leaching of P in dissolved reactive form (DRP) can be very high, even for heavy clay (50%–65%) soils. The Swedish/Norwegian soil test P‐AL (soil P extracted with acid NH 4 lactate, AL) proved useful as a potential indicator of DRP leaching risk (regression coefficient [ R 2 ] = 0.89) from fur farms. The upper 5‐cm soil layer, with 190% higher (median) soil P status than the 5–20 cm layer, was the major source of potential DRP leaching through soil columns at the site, despite having been under grass or green fallow for the past 8 y. In percolate from topsoil lysimeters, DRP concentration increased by 0.29 mg L –1 after the long‐term manure application but only by 0.14 mg L –1 after the single slurry application when compared to no addition of slurry. Therefore, the build‐up to a high soil P status due to the long‐term application of mink manure was more important than a single application of pig slurry at a rate corresponding to 22 kg P ha –1 with respect to soil leachate DRP losses in this lysimeter study. The study stresses the importance of precision farming, in which the amount of slurry‐P applied is based on testing the already existing soil P content.