Assessing strategies to mitigate phosphorus leaching from drained clay soils

作者：Ulen Barbro^*; Lar**o Mats; Koestel Johannes; Hellner Qarin; Blomberg Maria; Geranmayeh Pia

来源：Ambio, 2018, 47(S1): 114-123.

DOI：10.1007/s13280-017-0991-x

• Drain renovation
• Hydrological index
• Lime-filter ditch
• Soil tillage

Assessing mitigation of phosphorus (P) leaching from subsurface drainage systems is challenging due to high spatial and temporal variation in leaching. Mean measured total P leaching from a clayey soil in an eight-year study period (four replicates per treatment) was (kg ha(-1) year(-1)): 1.21 from shallow autumn tillage (ShT), 0.84 from unfertilised fallow (UF), 0.81 from conventional autumn ploughing (CT) and 0.57 from structure liming (SL-CT). Treatment was not significant using Richards-Baker flow index or a distance factor as covariate (p = 0.084 and 0.057). A tendency for lower leaching was obtained comparing SL-CT with ShT (p (adjusted) = 0.060 and 0.009 respectively). A combination of measures adapted to drainage conditions and clay content in different parts of the field is proposed since P leaching was approximately halved from an adjacent field (4.3 ha) in a three-year post-period compared with a three-year pre-period for structure liming the entire field and drainage system renovation plus structure lime drain backfilling.

• 出版日期2018-1