1、Designation:D297722Standard Practice forParticle Size Range of Peat Materials for HorticulturalPurposes1This standard is issued under the fixed designation D2977;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 Peat materials consist of particles with various sizes.This practice covers the separation of peat particles into coarse,medium,and f
3、ine size fractions using the 2.36 mm(No.8)and0.850 mm(No.20)sieves equipped with cover and bottompan.This practice is applicable for peat materials used in thehorticultural industry and can be used to verify the degree ofdecomposition of peat and to determine the foreign mattercontent.1.2 UnitsThe v
4、alues stated in SI units are to be regardedas standard.The values given in parentheses are provided forinformation only and are not considered standard.Reporting oftest results in units other than SI shall not be regarded asnonconformance with this standard.1.2.1 It is common practice in the enginee
5、ring/constructionprofession to concurrently use pounds to represent both a unitof mass(lbm)and of force(lbf).This practice implicitlycombines two separate systems of units;the absolute and thegravitational systems.It is scientifically undesirable to com-bine the use of two separate sets of inch-poun
6、d units within asingle standard.As stated,this standard includes the gravita-tional system of inch-pound units and does not use/present theslug unit of mass.However,the use of balances and scalesrecording pounds of mass(lbm)or recording density in lbm/ft3shall not be regarded as nonconformance with
7、this standard.1.3 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.3.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as theindustry standard.In addition,th
8、ey are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant di
9、gits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design.1.4 This practice offers a set of instructions for performingone or more specific operations.This document cannot rep
10、laceeducation or experience and should be used in conjunctionwith professional judgment.Not all aspects of this practice maybe applicable in all circumstances.This ASTM standard is notintended to represent or replace the standard of care by whichthe adequacy of a given professional service must be j
11、udged,nor should this document be applied without consideration ofa projects many unique aspects.The word“Standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus process.1.5 This standard does not purport to address all of thesafety concerns,if
12、any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with international
13、ly recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology
14、Relating to Soil,Rock,and ContainedFluidsD2974 Test Methods for Determining the Water(Moisture)Content,Ash Content,and Organic Material of Peat andOther Organic SoilsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design
15、 and Construction1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.22 on Media for PlantGrowth.Current edition approved Oct.1,2022.Published October 2022.Originallyapproved in 1971.Last previous edition approved in 201
16、4 as D2977 14.DOI:10.1520/D2977-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance wi
