5691 OSI) International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPFAHVW3AUWA NIO CTAHAAPTM3ALMW+ORGANISATION INTERNATIONALE DE NORMALISATION ANsi Internat Doc Sec: Equipment for planting --- Potato planters --- Method of testing First edition - 1981-07-01 UDC 631.332.7 Ref. No. ISO 5691-1981 (E) ISO 5691-1981 (E) Descriptors : agricultural machinery, planting machines, potatoes, definitions, tests. Price based on 3 pages Copyright International Organization for Standardization Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (IsO member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 5691 was developed by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, and was circulated to the member bodies in February 1980 Australia Finland Romania France Austria South Africa, Rep. of Belgium Germany, F. R. Spain Bulgaria India Switzerland China Italy Turkey Korea, Dem. P. Rep. of USSR Czechoslovakia Denmark Poland Portugal Egypt, Arab Rep. of The member body of the following country expressed disapproval of the document on technical grounds : United Kingdom International Organization for Standardization, 1981 ? Printed in Switzerland Copyright International Organization for Standardization Not for Res ISO 5691-1981 (E) INTERNATIONAL STANDARD Equipment for planting -- Potato planters --- Method of testing 1 Scope 4.6 tuber density : Number of tuber positions per hectare (ha), expressed in hectares to the power minus one (ha- 1) and This International Standard specifies a method of testing calculated according to the formula : potato planters to obtain comparable and reproducible measurements with regard to uniform placement of tubers and 108 Tuber density = other aspects of performance of the machine. Actual planting × Row spacing (cm) distance (cm) 2 Field of application 4.7 tuber mass : Mass, expressed in grams (g), of potato tuber. The average mass each tuber in a potato batch deter- This International Standard applies to all types of potato mined by weighing at least 30 tubers. planters. (Fertilizer distribution attachments should be removed from the machine during testing.) 4.8 tuber quantity or plant rate : Total mass of potatoes planted per hectare expressed in tonnes per hectare (t/ha) and 3 Reference calculated according to the formula : ISo 7256, Sowing equipment -- Single seed drills (precision Tuber mass (g) Tuber quantity = 100 × drills) - Methods of test 1) Actual planting Row distance (cm) spacing (cm) 4 Definitions 4.9 planting frequency : Average number of tubers planted For the purpose of this International Standard, the following per minute and per ridge expressed in minutes to the power definitions apply. minus one (min -1). 4.1 tuber distance : Distance between adjacent tubers in a 4.10misses : (See clause 3.9 of Is0 7256). row, measured from tuber centre to tuber centre and expressed in centimetres. 4.11 multiples : (See clause 3.10 of 1S0 7256). 4.2 rated planting distance : Planting distance, expressed 4.12 coefficient of variation (CV) : Variation of the in centimetres, claimed by the manufacturer in his operating in- actual distance within a row, given as a percentage of the rated structions. planting distance. 4.3 actual planting distance : Mean value, expressed in 4.13 planting errors : Deviations from the desired equal centimetres, of at le