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Assessing strategies to mitigate phosphorus leaching from drained clay soils

机译:评估减轻流失粘土土壤中磷浸出的策略

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摘要

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.
机译:评估缓解地下排水系统中磷(P)的淋溶性具有挑战性,因为淋溶的时空变化很大。在八年的研究期内(每次处理重复四次)从黏性土壤中测得的平均P淋溶总量为(kg·ha -1 year -1 ):1.21(浅层)秋季耕作(ShT),未受精休耕(UF)的0.84,常规秋季耕作(CT)的0.81和结构石灰(SL–CT)的0.57。使用Richards-Baker流量指数或距离因子作为协变量,治疗意义不显着(p = 0.084和0.057)。将SL-CT与ShT进行比较,可以获得较低的浸出趋势(p分别调整为0.060和0.009)。提出了一种适合于排水条件和田间不同地区粘土含量的措施的组合,因为在三年后的三年中,与邻近田地(4.3公顷)相比,P浸出大约减少了一半用于整个现场的结构石灰和排水系统的翻新,以及结构石灰排水的回填。

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