Abstract In agricultural land use, organic residues such as compost, digestate, and sewage sludge are discussed as costeffective soil conditioner that may improve the water holding capacity and crop available soil moisture. The objective of this study is to determine the effect of application of digestates with different compositions in maize, sugar beet and winter wheat, compost of shrub debris and sewage sludge on shrinkage behaviour and contact angle of till-derived loamy topsoil of a Haplic Luvisol under agricultural use. Novelty is the simultaneous determination of contact angle and shrinkage of soils amended with digestates composed of different composition in maize, sugar beet and winter wheat, compost of shrub debris and sewage sludge. The results suggest that the application of organic residues impacts the air capacity, while the contact angles remained in the subcritical range between > 0° and < 90°. The relationship between CA values and moisture ratios, ϑ, during proportional shrinkage was positive and linear (r2 of 0.98) and negative during residual- and zero-shrinkage (r2 of 0.93).

中文翻译：

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同时测定有机残留物改良的壤土表土的润湿性和收缩率

摘要 在农业土地利用中，有机残留物如堆肥、消化物和污水污泥被讨论为具有成本效益的土壤调节剂，可以提高持水能力和作物可用土壤水分。本研究的目的是确定在玉米、甜菜和冬小麦中施用不同成分的消化物、灌木碎片堆肥和下水道污泥对 Haplic Luvisol 的耕作衍生的壤土表土的收缩行为和接触角的影响。农业用途。新颖性是同时测定用玉米、甜菜和冬小麦中不同成分组成的消化物、灌木碎片堆肥和污水污泥改良的土壤的接触角和收缩率。结果表明，有机残留物的应用会影响空气容量，而接触角保持在 > 0° 和 < 90° 之间的亚临界范围内。CA 值与水分比率 ϑ 之间的关系在比例收缩期间呈正线性（r2 为 0.98），而在残余收缩和零收缩期间为负（r2 为 0.93）。