1.1 泥炭材料由大小不同的颗粒组成。本规程涵盖了使用2.36 mm（8号）和0.850 mm（20号）筛子将泥炭颗粒分离为粗粒、中粒和细粒级。本规程适用于园艺行业中使用的泥炭材料，可用于验证泥炭的分解程度和确定异物含量。 1.2 单位- 以SI单位表示的值应视为标准值。括号中给出的值仅供参考，不被视为标准值。以SI以外的单位报告试验结果不应视为不符合本标准。 1.2.1 在工程/建筑专业中，通常同时使用磅表示质量单位（lbm）和力单位（lbf）。 这种做法隐含地结合了两种不同的单位制；绝对系统和引力系统。从科学上讲，在一个标准中使用两套独立的英寸磅单位是不可取的。如前所述，本标准包括以英寸磅为单位的重力系统，不使用/表示弹芯质量单位。但是，使用天平和天平记录质量磅（lbm）或记录密度磅/英尺 3. 不得视为不符合本标准。 1.3 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 . 1.3.1 本标准中用于规定数据收集/记录或计算方式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。考虑工程设计分析方法中使用的有效数字超出了本标准的范围。 1.4 本实践提供了一组用于执行一个或多个特定操作的说明。本文件不能取代教育或经验，应与专业判断一起使用。并非本惯例的所有方面都适用于所有情况。 本ASTM标准并非旨在代表或取代判断特定专业服务是否充分的谨慎标准，也不应在未考虑项目的许多独特方面的情况下应用本文件。本文件标题中的“标准”一词仅表示该文件已通过ASTM共识程序获得批准。 1.5 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。 1.6 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。 =====意义和用途====== 5.1 这种做法主要用于园艺行业，根据粒度将泥炭材料分离成任意部分。根据粒度对泥炭材料的物理分离提供了泥炭样品性质的有用指标，例如未处理泥炭的孔隙空间和分解程度。它还提供了一种方法来确定未处于分裂状态的异物（如棍子、石头和玻璃）的数量。 注1: 本标准产生的结果质量取决于执行人员的能力以及所用设备和设施的适用性。符合实践标准的机构 第3740列 通常被认为能够胜任和客观的测试/取样/检查等。 本标准的使用者应注意遵守实践 第3740列 其本身不能保证可靠的结果。可靠的结果取决于许多因素；实践 第3740列 提供了评估其中一些因素的方法。

1.1 Peat materials consist of particles with various sizes. This practice covers the separation of peat particles into coarse, medium, and fine size fractions using the 2.36 mm (No. 8) and 0.850 mm (No. 20) sieves equipped with cover and bottom pan. This practice is applicable for peat materials used in the horticultural industry and can be used to verify the degree of decomposition of peat and to determine the foreign matter content. 1.2 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard. 1.2.1 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) or recording density in lbm/ft 3 shall not be regarded as nonconformance with this standard. 1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.3.1 The procedures used to specify how data are collected/recorded or calculated in this 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 this standard to consider significant digits used in analysis methods for engineering design. 1.4 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. The word “Standard” in the title of this document means only that the document has been approved through the ASTM consensus process. 1.5 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. 1.6 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. ====== Significance And Use ====== 5.1 This practice is primarily used in the horticulture industry to separates peat material into arbitrary fractions based on particle size. Physical separation of peat material according to particle size provides a useful indicator of the properties of a peat specimen such as pore space and degree of decomposition for unprocessed peat. It also provides a means of determining the amount of foreign matter not in a divided state such as sticks, stones, and glass. Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.