1.1 本规范涵盖了对含有有机材料的土壤进行物理评估，并将其用作绿化和施工中植被生长的表土。对于分类，可以使用完整的农业纹理分类。评估用作表土的土壤必须满足 表1 . 1.2 当对土壤进行物理评估时，相对于其支持植物生长（主要是草）的适宜性，必须进行测试，以确定有机物、水分含量、无机物（砂、淤泥和粘土）、pH值、含盐量、阳离子交换容量百分比和有害物质的存在和数量。 1.3 土壤中正确的营养素、盐分和pH值是植物健康生长所必需的。 本规范不包括营养素的测定，也不包括其可用性。 1.4 表土成分的典型范围见 表1 落在这些范围内的土壤通常会形成合适的表层土。土壤用作表层土，有机质含量介于10至90 %, 可能需要在使用前进行修改。然而，必须认识到，在某些地理区域 表1 可能很困难。在这种情况下，可能需要考虑替代规范，或采用符合 表1 不包括砂、粉土和粘土含量，因为这些材料将来自被修正的地下土壤。 当使用工程土壤改良剂时，有机质值需要大于75 % 以帮助重建地下土层。 1.5 单位- 以SI单位表示的值应视为标准值。本标准不包括其他计量单位。 1.6 所有观察值和计算值应符合实践中制定的有效数字和四舍五入指南 第6026页 ，除非被本试验方法取代。 1.6.1 用于规定如何在标准中收集/记录和计算数据的程序被视为行业标准。此外，它们代表了通常应保留的有效数字。使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑； 通常的做法是增加或减少报告数据的有效位数，以与这些考虑相称。考虑工程数据分析方法中使用的有效数字超出了这些测试方法的范围。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers a physical evaluation of a soil containing organic material, relative to its use as a topsoil for vegetative growth purposes in landscaping and construction. For classification, a full agricultural textural classification may be used. Soils being evaluated for use as a topsoil must meet the requirements in Table 1 . 1.2 When physically evaluating a soil, relative to its suitability to support plant growth (primarily grasses), tests must be made to determine the presence and the amount of organic matter, moisture content, inorganic matter (sand, silt and clay), pH, salt content, cation exchange capacity percentages and deleterious materials. 1.3 The presence in the soil of the correct nutrients, salts, and pH is necessary for healthy plant growth. This specification does not cover a determination of the nutrients, nor their availability. 1.4 Typical ranges of topsoil composition are presented in Table 1 . Soils falling within these ranges will generally form a suitable topsoil. Soils being used as a topsoil with organic matter contents between 10 and 90 %, may need to be amended prior to use. It must, however, be recognized that in some geographic regions, achieving the values in Table 1 could be difficult. In such cases, alternative specifications may need to be considered, or an engineered soilamendment meeting the requirements in Table 1 excluding the sand, silt, and clay content as those materials will come from the subsurface soil being amended. When using an engineered soil amendment, the organic matter values need to be >75 % to help rebuild the subsoil layers. 1.5 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 , unless superseded by this test method. 1.6.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of these test methods to consider significant digits used in analysis methods for engineering data. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.