BS EN 15761-2009 Pre-shaped growing media - Determination of length width height volume and bulk density《预成型生长介质 长度 宽度 高度 体积和松密度的测定》.pdf

《BS EN 15761-2009 Pre-shaped growing media - Determination of length width height volume and bulk density《预成型生长介质 长度 宽度 高度 体积和松密度的测定》.pdf》由会员分享，可在线阅读，更多相关《BS EN 15761-2009 Pre-shaped growing media - Determination of length width height volume and bulk density《预成型生长介质 长度 宽度 高度 体积和松密度的测定》.pdf（16页珍藏版）》请在麦多课文档分享上搜索。

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15761:2009Pre-shaped growing media Determination of length,width, height, volume and bulkdensityLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Unc

2、ontrolled Copy, (c) BSIBS EN 15761:2009 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 15761:2009.The UK participation in its preparation was entrusted to TechnicalCommittee AW/20, Top soil and other growing media.A list of organizations represented on this com

3、mittee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 61954 0ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obli

4、gations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2010Amendments issued since publicationDate Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EUROPEA

5、N STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15761 December 2009 ICS 65.080 English Version Pre-shaped growing media - Determination of length, width, height, volume and bulk density Supports de culture prforms - Dtermination de la longueur, de la largeur, de la hauteur, du volume et de la masse vo

6、lumique apparente Vorgeformte Kultursubstrate - Bestimmung von Lnge, Breite, Dicke, Volumen und Schttdichte This European Standard was approved by CEN on 1 November 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

7、 Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English,

8、French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyp

9、rus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION C

10、OMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15761:2009: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDAR

11、DS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 2 Contents Page Foreword . 3Introduction . 41 Scope 52 Normative references 53 Terms and definitions . 54 Principle . 65 Apparatus . 66 Procedure . 66.1 Accuracy 66.2 Number of measurements 66.3 Test procedure 76.3.1 G

12、eneral . 76.3.2 Test specimens with holes or grooves . 76.4 Determining the weight . 77 Calculations and expression of results 77.1 Length, width and height 77.2 Volume 77.2.1 Accuracy 77.2.2 Test specimens with no recesses . 77.2.3 Test specimens with recesses . 77.3 Bulk density . 88 Precision 89

13、Test report 8Annex A (informative) Results of an inter-laboratory trial 10A.1 Trials . 10A.2 Results 11Bibliography 12Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 3 Foreword This document (EN 15761:2009) has been

14、 prepared by Technical Committee CEN/TC 223 “Soil improvers and growing media”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2010, and conflicting

15、national standards shall be withdrawn at the latest by June 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN

16、/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, L

17、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 4 Introduction This European S

18、tandard has been produced so that there is a standard method to measure and weigh pre-shaped growing media and to calculate the volume and bulk density. The volume of growing media is a useful attribute for growers and is critical for ensuring plants have sufficient growing media for their root syst

19、em. The bulk density is crucial as the reporting of all chemical analyses is expressed in units of weight per volume, and the volume is determined from the weight of the sample used for the chemical analyses. Pre-shaped growing media is generally at present made from Stonewool or Rockwool or mineral

20、 wool. They are known by various names, typically: “plugs“ are small blocks used for seedlings, which are generally cylindrical in shape and with a diameter from 20 mm; once the seed has germinated the seedling in the plug may then be placed into “blocks“; “blocks“ may have holes to take plugs and c

21、an vary in size from 40 mm 40 mm 40 mm up to 100 mm 200 mm 65 mm; they are generally used for propagation purposes; “slabs“ are used for growing vegetables and range in size from 370 mm 240 mm 100 mm to 2 000 mm 200 mm 75 mm. It is anticipated that this standard will be developed to encompass other

22、new pre-shaped growing media in due course, e.g. coir blocks. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 5 1 Scope This European Standard describes a method of determination of length, width, height, volume and

23、 bulk density of rectangular pre-shaped growing media. In this standard “pre-shaped growing media“: includes solid, regular shaped, stable growing media sold, which are ready for use as a growing media, where the dimensions and corners are stable, and the surfaces and edges are perpendicular to each

24、 other including mineral wool and polyurethane products; does not include solid growing media that has to be hydrated for it to form, varies in dimension with varying water content for example coir or peat slabs or growing bags. The minimum linear dimension (length, width or height) for blocks to wh

25、ich this standard applies is 40 mm, and the maximum dimension is 2 000 mm. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referen

26、ced document (including any amendments) applies. CR 13456:1999, Soil improvers and growing media Labelling, specifications and product schedules 3 Terms and definitions For the purposes of this document, the terms and definitions given in CR 13456:1999 and the following apply. 3.1 length l longer li

27、near dimension of the major surface of the test specimen 3.2 width w shorter linear dimension of the major surface of the test specimen measured at right angles to the length 3.3 height h linear dimension measured perpendicularly to the length and the width planes 3.4 depth d linear dimension measur

28、ing how deep recess intrude into the media 3.5 bulk density indication of how much 1 l of the product weighs, with the volume being determined in a standardized way NOTE The bulk density is expressed in grams per litre (g/L) or in kilograms per cubic metre (kg/m). Licensed Copy: Wang Bin, ISO/EXCHAN

29、GE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 6 4 Principle The test specimen is placed on a flat surface and measurements for length, width and height are taken. The volume is calculated from these dimensions and, after the determination of the we

30、ight, the bulk density is calculated. 5 Apparatus 5.1 Flat surface, horizontal, flat stable surface, e.g. table top, which is large enough for the test specimen and the measuring devices. 5.2 Metal rule or metal tape, graduated in millimetres and permitting reading to 0,5 mm or less. NOTE Measures c

31、onforming to the requirements of OIML R35-1:2007, Material measures of length for general use. Part 1: Metrological and technical requirements 1, Class II are appropriate. This can be obtained from http:/www.oiml.org/publications/. 5.3 Height gauge, having an accuracy of at least 0,5 mm. 5.4 Pressur

32、e plate, square with a flat base and having sides of dimensions 100 mm x 100 mm, which weighs (50 1) g. NOTE Any other linear measuring device may be used if the results can be determined to within 0,5 mm. 5.5 Balance, having an accuracy of 0,1 g. NOTE Any balance conforming to the requirements of O

33、IML R76-1:2006, Non-automatic weighing instruments. Part 1: Metrological and technical requirements Tests 2, Class II is appropriate. This can be obtained from http:/www.oiml.org/publications/. 6 Procedure 6.1 Accuracy Record all dimensional measurements to the nearest 0,5 mm or less. Record weight

34、to the nearest 0,1 g or less. 6.2 Number of measurements For measurement of a nominal dimension of 150 mm or less, make one measurement using the pressure plate and the height gauge. Position the pressure plate centrally on the test specimen, covering the maximum area possible. For measurement of a

35、nominal dimension of more than 150 mm or less than 600 mm, make two measurements at one-third and two-third intervals laterally across the surface being measured, using an appropriate rule or tape. For measurement of a nominal dimension of more than 600 mm, make three measurements at one-quarter, on

36、e-half and three-quarter intervals laterally across the surface being measured, using an appropriate rule or tape. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 7 6.3 Test procedure 6.3.1 General Lay the test spec

37、imen carefully on a flat surface. Determine the linear measurements by making the required number of measurements (6.2) between undamaged edges of the test specimen, keeping the tape or rule perpendicular to the edge. 6.3.2 Test specimens with holes or grooves If the test specimen has holes or groov

38、es, such as a mineral wool block for culturing, then determine the volume of these recesses for subtracting from the external volume. Using the metal rule or tape (5.2), determine the length, width and determine the depth of each rectangular recess at two points on each axis. Determine the diameter

39、and depth of each cylindrical recess at two points for each axis. Ensure the depth is measured to the major recessed plane, and not to the depth of any guide hole used to drill the recessed hole. If the recess is neither rectangular nor cylindrical, then determine its volume in a mathematically corr

40、ect manner by using the average of at least two measurements per axis. 6.4 Determining the weight After determining length, width and height (6.2), determine the weight of the test specimen using the balance (5.5). 7 Calculations and expression of results 7.1 Length, width and height Use the recorde

41、d values of the length, width and height of the test specimen, which are all expressed in millimetres, to calculate the mean values for l, w and h. Round each mean to the nearest millimetre. 7.2 Volume 7.2.1 Accuracy Record all values for volume to the nearest cubic millimetre, and then divide by 10

42、6to obtain the volume in litres. Record to four significant figures. 7.2.2 Test specimens with no recesses Determine the volume by multiplying the values or, where more than one value has been determined, the mean values for the length, width and height measurements. 7.2.3 Test specimens with recess

43、es In the case of test specimens that have recesses, e.g. rock wool blocks, subtract the volume of plant holes and grooves from the externally measured volume. Calculate the volume of the recesses in the following way: In the case of a rectangular recess, substitute the mean values for the length (l

44、), width (w) and depth (d) into the following formula: v = l w d (1) where Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 8 v is the volume, expressed in cubic millimetres (mm3); l is the length, expressed in milli

45、metres (mm); d is the depth, expressed in millimetres (mm); w is the width, expressed in millimetres (mm). In the case of a cylindrical recess, substitute the mean values for the diameter (D) and depth (d) into the following formula: v = 0,25 D2 d (2) where v is the volume, expressed in cubic millim

46、etres (mm3); D is the diameter, expressed in millimetres (mm); d is the depth, expressed in millimetres (mm). 7.3 Bulk density Calculate the bulk density, in grams of substrate per litre. Quote the mean results to three significant figures in grams per litre or kilograms per cubic metre, which are n

47、umerically the same. Vm=d (3) where mdis the mass of the test specimen, expressed in grams (g); V is the volume of the test specimen, expressed in litres (L). 8 Precision Perform the analysis on the basis of a minimum of five replicates for mats and twenty replicates for blocks that have been taken

48、randomly from each batch. Record the results for each replicate. NOTE 1 Test specimens are randomly taken. NOTE 2 Typical performance characteristics for precision and accuracy are shown in Table A.1. 9 Test report Include the following information in the test report: a) a reference to this Standard

49、; b) a complete identification of the test specimen(s); c) the results of the determinations; Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/10/2010 07:44, Uncontrolled Copy, (c) BSIBS EN 15761:2009EN 15761:2009 (E) 9 d) any deviations from the procedure specified, as well as any other factor that might have affected the results. NOTE The test report may be prepared separately or in conjunction with the test re