ABSTRACT

It is necessary to know the effect of organic matter on soil physical properties for successful soil management. A short-term incubation study was carried out to investigate the effects of different compost materials on soil aggregation and mechanical properties. Compost materials derived from cattle, sheep, poultry manure, plant residues, and a blend of an equal amount of those residues/wastes (called as mixture) were mixed with soil at doses of 1%, 2%, 3% and 4% with control treatment and subjected to a 60-day incubation period. It was revealed that compost materials significantly increased the values of water-stable aggregate (WSA), organic carbon (OC) and moisture content at tension values of pF 0 (saturation), pF 1.7 (aeration porosity), pF 2.54 (field capacity) and pF 4.2 (permanent wilting point), as well as the hydraulic conductivity (HC) and liquid limit (LL) values; however, they decreased the bulk density (BD) and coefficient of linear extensibility (COLE) values. On the other hand, WSA, OC, saturation, BD, LL, and shrinkage limit (SL) values showed distinct changes in application doses. However, it was found that material and dose applications had no effect on the plasticity index (PI), shrinkage index (SI) or clay activity (CA). The increases in WSA, HC and OC values compared to the control due to the increasing amount of compost were more evident than other aggregation properties. Overall, the results showed that compost materials and dose applications are more effective on the soil aggregation properties compared to the mechanical properties.

摘要

为了成功地进行土壤管理，有必要知道有机物对土壤物理特性的影响。进行了短期孵化研究，以研究不同堆肥材料对土壤聚集和机械性能的影响。来自牛，羊，家禽粪便，植物残渣的混合肥料，以及等量的这些残渣/废物的混合物（称为混合物））与土壤以对照处理分别以1％，2％，3％和4％的剂量混合，并经历60天的温育期。结果表明，堆肥材料在pF 0（饱和度），pF 1.7（曝气孔隙率），pF 2.54（田间持水量）的张力值下显着提高了水稳定集料（WSA），有机碳（OC）和水分含量。 pF 4.2（永久萎point点），水力传导率（HC）和液体极限（LL）值；但是，它们降低了堆积密度（BD）和线性延伸系数（COLE）值。另一方面，WSA，OC，饱和度，BD，LL和收缩极限（SL）值显示出施用剂量的明显变化。然而，发现材料和剂量的施加对可塑性指数（PI），收缩指数（SI）或粘土活性（CA）没有影响。由于堆肥量的增加，与对照相比，WSA，HC和OC值的增加比其他聚集特性更为明显。总体而言，结果表明，与机械性能相比，堆肥材料和剂量施用对土壤团聚性能更有效。