ICS 65.060.30  
 
Reference number  
DRS 272:2015  
© RSB 2021  
  
 RWANDA 
STANDARD  DRS  
272 
 
First edition  
2015 -05-08 
Reaffirmed 2021 -mm-dd 
Seeder and planter — Test methods  
   
DRS 272: 2015   
©RSB 2012  - All rights reserved                  ii 
 In order to match with technological development and to keep continuous progress in industries, 
standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
© RSB 2021  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without 
prior written permission from R SB. 
Requests for permission to reprodu ce this document should be addressed to : 
Rwanda Standards  Board  
P.O Box 7099 Kigali -Rwanda  
KK 15 Rd, 49  
Tel. +250 788303492  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw   DRS 272: 2015  
iii                ©RSB 2021  - All rights reserved  
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ ...................  iv 
1 Scope  ................................ ................................ ................................ ................................ .............  1 
2 Normative references  ................................ ................................ ................................ ...................  1 
3 Terms and definitions  ................................ ................................ ................................ ..................  1 
4 General conditions for test and inspection  ................................ ................................ ...............  1 
4.1 Seeder on test  ................................ ................................ ................................ ...............................  1 
4.2 Role of the manufacturer/dealer  ................................ ................................ ................................ . 2 
4.3 Running -in and preliminary adjustment  ................................ ................................ ....................  2 
4.4 Test instruments and other needs  ................................ ................................ ..............................  2 
4.5 Suspension of test  ................................ ................................ ................................ .......................  2 
5 Test and i nspection  ................................ ................................ ................................ ......................  2 
5.1 Verification of the manufacturer’s technical data and information  ................................ ........  2 
5.2 Laboratory performance test  ................................ ................................ ................................ ...... 2 
5.2.1  Test for metering mechanism  ................................ ................................ ................................ ..... 2 
5.2.2  Investigation on pattern of seed and fertilizer deposited  ................................ ........................  2 
5.3 Field performance test  ................................ ................................ ................................ .................  3 
6 Data analysis  ................................ ................................ ................................ ................................ . 4 
7 Test report  ................................ ................................ ................................ ................................ ..... 4 
Annex  A (normative)  Inspection sheet for seeder  ................................ ................................ ................  5 
Annex  B (informative)  Laboratory performance test data sheet  ................................ .........................  8 
B.1 Seed metering  ................................ ................................ ................................ ...............................  8 
B.1.1  Test condition  ................................ ................................ ................................ ...............................  8 
B.2 Fertilizer  metering  ................................ ................................ ................................ ........................  9 
Annex  C (informative)  Field performance test data sheet  ................................ ................................ . 11 
Annex  D (informative)  Formulas used during calculations and testing  ................................ ...........  14 
D.1 Field performance test  ................................ ................................ ................................ ...............  14 
D.1.1  Delivery rate  ................................ ................................ ................................ ................................  14 
D.1.2  effective field capacity, 𝒆𝒇𝒄(m2/h) ................................ ................................ .............................  15 
D.1.3  Theoretical field capacity,  𝒕𝒇𝒄 (m2/h) ................................ ................................ ........................  15 
D.1.4  Field efficiency,  𝜺𝒇 ................................ ................................ ................................ ......................  15 
D.1.5  Fuel consumption, 𝑭𝑪, (L/h)  ................................ ................................ ................................ ...... 15 
 DRS 272: 2015   
©RSB 2012  - All rights reserved                  iv 
 Foreword   
Rwanda Standard s are prepared  by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards adopted 
by Technical committ ees are ratifie d by me mbers of RSB Board of Director s for publication and gazettment as 
Rwanda Standards.  
DRS  272 was prepared by Technical Committee RSB/TC 023, Road Vehicles . 
In the preparation of this standard, reference was made to the following standard : 
PAES 123: 2 001, Agricultural Machinery — Seeder and Planter — Methods of Test  
The assistance de rived from the above source is hereby acknowledged with thanks.  
The first edition (RS  272: 2015 ) has been re affirmed  by the Board on dd-mm-2021 . 
Committee membership  
The following organizations were represented on the Technical Committee on Road Vehicles  (RSB/TC 023) in 
the preparation of this standard.  
ATECAR  
KENSRIN COMPANY Ltd  
MOTA ENGIL  
PASCAL Technology Ltd  
PURE PRO Ltd  
Rwanda Polytechnic/ Integrated Polytechnic Regional College Ngoma (IPRC Ngoma)  
Rwanda Polytechnic / Integrated Polytechnic Regional College Kigali (RP/IPRC Kigali)  
University of Rwanda/ College of Science and Technology (UR -CST)  
VW Rwanda Ltd  
Rwanda  Standards Board  (RSB) – Secretariat  
  DRS 272: 2015  
1                ©RSB 2021  - All rights reserved  
 Seeder and planter — Test methods  
1 Scope   
This Draft Rwanda Standard specifies the  test and inspection  methods  for various types of seeders and planters 
such as manually -operated, animal -drawn and tractor power -driven drill and planter with or without fertilizer 
applicator.  
This standard is not applicable to broadcaster and wetland seeder.  
2 Normative references   
The following documents are referred to in the text in such a way that some or all of  their content constitutes 
requirements of this document.  For dated references, only the edition  cited applies. For undated references, the 
latest ed ition of the referenced document (including any amendments) applies.  
RS 241, Agricultural machinery — Methods of sampling  
3 Terms and definitions   
For the purposes of this standard , the follow ing terms and definitions apply . 
3.1  
fuel consumption  
volume  of fuel consumed by the engine on per hour basis  
3.2  
wheel slip of seeder or planter  
Wheels slip is determined by the following formula:  
𝑊ℎ𝑒𝑒𝑙 𝑠𝑙𝑖𝑝=𝑁1−𝑁0
𝑁1×100 
where  
 𝑁1 is the sum of the revolutions of all driving wheels for a given distance with slip, revolution per minute 
(rpm);  
𝑁0  is the sum of the revolutions of all driving wheels for the same distance without slip, rpm . 
4 General conditions for test and inspection  
4.1 Seeder on test  
The seeder or planter submitted for test shall be taken from production model or series of production and shall 
be sampled in accordance with RS 241.   
©RSB 2012  - All rights reserved                  2 
 4.2 Role of the manufacturer/dealer  
The manufacturer/dealer/client should comply with the test pro cedures of national testing authority.  
4.3 Running -in and preliminary adjustment  
The seeder to be tested shall be run -in prior to test as recommended by the manufacturer.  
4.4 Test instruments and other needs  
The instruments to be used shall have been checked and c alibrated by the authorized authority prior to the 
measurements. The seeds to be used during the test shall be of varieties accepted by authorized authority in 
the country.  
4.5 Suspension of test  
If during the test run, the seeder stops due to breakdown or mal function so as to affect the seeder’s performance, 
the test shall be suspended at the discretion of the test engineer and concurred by the company representative.  
5 Test and inspection  
5.1 Verification of the manufacturer’s technical data and information  
5.1.1  This inspection is carried out to verify the mechanism, main dimensions, materials and accessories of the 
seeder in comparison with the list of manufacturer’s technical data and information.  
5.1.2  A plain and level surface shall be used as reference plane for verification of dimensional seeder 
specifications.  
5.1.3  The items to be inspected and verified shall be recorded in Annex A . 
5.2 Laboratory performance test  
5.2.1  Test for metering mechanism  
5.2.1.1  This is carried out  to examine the performance of metering mechanism, the result of which can provide 
the basic data for the field performance.  
5.2.1.2  This test shall be conducted on the kind of seed/fertilizers of which the machine is suitable as specified 
by the manufactu rer.  
5.2.1.3  In case of hand seeder, the number of seeds delivered by one action of an operator’s hand under 
appropriate adjustment of metering mechanism shall be confirmed for each kind of seed.  
5.2.1.4  In case of other seeders, they are jacked up and t he drive wheel of the metering mechanisms is rotated 
in a number of revolutions to collect sufficient amount of seeds/fertilizer to compute for its delivery rate. The 
delivery rates per hectare are calculated with the weight of seeds/fertilizer from the de livery tube with the 
corresponding distance travelled by the seeder based on the number of revolutions of the drive wheel.  
5.2.1.5  The test shall be carried out at full, half and one -eight of the seeder’s hopper capacity with three delivery 
rate settings – maximum, minimum and intermediate.  
5.2.2  Investigation on pattern of seed and fertilizer deposited  
5.2.2.1  This is carried out to investigate the pattern of seed and fertilizer deposited by the seeder.  DRS 272: 2015  
3                ©RSB 2021  - All rights reserved  
 5.2.2.2  This test may be accomplished by running the seed er with full outfit over a greased board or a sheet of 
blanket or felt at the same speed as in the field. The seeds and fertilizer are trapped on the board or the sheet 
at the points where they fall.  
5.2.2.3  The items to be investigated and measured shall  be recorded in Annex B.  
5.3 Field performance test  
5.3.1 The test is carried out to obtain actual data on overall machine performance, operating accuracy, work 
capacity and adaptability to varied crops and field conditions.  
5.3.2 The test shall be conducted for at least two test trials for each kind of seed the seeder is suitable.  
5.3.3 The seeds to be used for the test shall be the same as the ones used in metering mechanism test. Each 
test trial shall be conducted in an area of not less than 500 m2 for man ual seeding implement and 1 000 m2 for 
power -operated seeders.  
5.3.4  Measure at random two -meters along each row for at least ten rows planted by the seeder. For each two 
meter distance, measure/record the following:  
a) depth of seeding;  
b) distance between h ills (if applicable);  
c) number of seeds planted per hill;  
d) number of missed hill;  
e) number of damaged/cracked seeds; and  
f) number of hills with incorrect number of seeds delivered . 
5.3.5  The additional following items shall be measured, observed and computed:   
a) performance  and accuracy; and the following items shall be recorded:  
1) space of rows planted;  
2) population of seeds planted in unit area;  
3) rate of missing hill (in hill planting);  
4) wheel slippage and sinkage;  
5) ease of handling and operation;  
6) ease of turning;  
7) ease of refilling seed or fertilizer; and  
8) ease of adjustments .  
b) work rate and labour requirement, the following items shall be recorded:  
1) actual travelling speed;  
2) actual operating time;   
©RSB 2012  - All rights reserved                  4 
 3) time spent for turning at headland;  
4) time spen t for adjustment of machine;  
5) time spent for machine trouble;  
6) working capacity (ha/h);  
7) fuel consumption (for tractor power -driven seeders); and  
8) required number of workers  
5.3.6  The items to be measured and observed shall be recorded in Annex C.  
6 Data an alysis  
The formulas to be used during calculations and testing are given in Annex D.  
7 Test report  
The test report shall include the following information:  
a) name of testing agency;  
b) test report number;  
c) title;  
d) summary;  
e) purpose and scope of test;  
f) methods of test;  
g) description of the machine;  
h) table 1 — Machine specifications;  
i) table 2 — Laboratory performance test data;  
j) table 3 — Field performance test data;  
k) observations; and  
l) name and signature of test engineer.  DRS 272: 2015  
5                ©RSB 2021  - All rights reserved  
 Annex  A 
(normative)  
 
Inspection sheet fo r seeder  
Name of applicant: ____________________________________________________________________  
             Address:__________________________________________________________________________  
            Telephone No.: ____________________________________ ________________________________  
Name of distributor: _______________________________________________________________________  
           Address: __________________________________________________________________________  
Name of manufacturer: _____________ _______________________________________________________  
          Factory address:_____________________________________________________________________  
General information  
Brand:_________________________________________Model:_______________________________ ____  
Serial No.:______________________________________  
Classification (hand seeder, planter, seed drill): _________________________________________________  
Production date of seeder to be tested (if available): _____________________________________________  
Table  A.1 — Items to be inspected  
Items  Manufacturer’s 
specification  Verification by 
testing agency  
A.1 Dimensions and weight of the seeder    
Overall length, mm    
Overall width, mm    
Overall height, mm    
Weight (hoppers empty), kg    
A.2 Number of rows and row spacing, mm    
A.3 Nominal working width, mm    
A.4 Hill distance, mm (if applicable)    
A.5 Seeds and their condition for which 
equipment is suitable    
A.6 Numbers of fertilizer openings and 
fertilizers for which the equipment is suitable    
A.7 Suitable field conditions    
A.8 Travelling    
A.8.1 Source of power     
©RSB 2012  - All rights reserved                  6 
 Manual    
Animal -drawn    
Tractor -power driven    
Seed drill    
planter    
A.8.2 Recommended travelling speed of 
equipment, m/s    
Recommended minimum drawbar output    
A.9 Metering mechanism    
A.9.1 Type and method of changing delivery 
rate   
Seed    
Fertilizer    
A.9.2 Source of power of metering 
mechanism    
Ground wheel    
PTO   
Others    
A.9.3 Recommended PTO speed, rpm (if 
applicable)    
A.9.4 Transmission mechanism and speed 
ratio of of metering shaft to put shaft (ground 
wheel or PTO shaft)    
A.10 Hill -dropping mechanism    
A.11 Hopper    
A.11.1Number    
Seed    
Fertilizer    
A.11.2 Capacity, L    
Seed    
Fertilizer    
A.11.3 Material    
Seed    
Fertilizer    
A.12 Clutch for metering mechanism    
Type    
 Location    
A.13 Furrow or hole opener    
Type    
Material    
A.14 Seed covering device    
Type    DRS 272: 2015  
7                ©RSB 2021  - All rights reserved  
 Material    
A.15 Location of fertilizer outlet related to 
seed outlet    
A.15.1 Fertilizer covering device (if 
applicable)    
Type    
Material    
A.16 Ground wheel    
Diameter, mm    
Material    
A.16 Handle of animal -drawn equipment    
Construction    
Height of handle from ground level, mm    
Detail of adjustment    
A.17  Marking device (detail of marking)    
A.18  Hitch shape and construction (in case 
of tractor mounted with category of three 
point linkage)    
A.19 Safety arrangement    
Cover    
transmission    
Other moving parts    
Other details    
A.20Recommended travelling speed, m/s    
A.21 Working capacity, ha/h (given by the 
manufacturer)    
A.22  Any other detail (special features)    
  
©RSB 2012  - All rights reserved                  8 
 Annex  B  
(informative)  
 
Laboratory performance test data sheet  
B.1 Seed  metering  
Date of test:  _____________________________________________________________________________  
B.1.1  Test condition  
B.1.1.1  Conditions  of seeds  
B.1.1.1.1  Name of seed: _________________________________________________________________  
B.1.1.1. 2 Variety of seeds: ________________________ _______________________________________  
B.1.1.1. 3 Shape: _______________________________________________________________________  
B.1.1.1. 4 Average size of seeds: ___________________________________________________________  
 Length,mm: 
____________________________________________________________________________________  
 Width,mm: 
____________________________________________________________________________________  
 Thickness,mm: 
______________________________________________________________ ______________________  
B.1.1.1. 5 Weight of 1000 seeds, g__________________________________________________________  
B.1.1.1. 6 Moister content % wb: ___________________________________________________________  
B.1.1.1. 7 Bulk density, kg/L: ___________________ ___________________________________________  
B.1.1.1. 8 Purity (%), uniformity of size, etc.: __________________________________________________  
B.1.1.2  Condition  of grain  seeder: ________________________________________________________  
B.1.1.2.1  Metering shaft speed (adjustment, if any): ____________________________________________  
B.1.1.2. 2 Mechanism and speed: __________________________________________________________  
B.1.1.2. 3  Delivery opening adjustment: _____________________________________________________ _ 
Table  B.1.2  — Delivery rate setting  
Particulars  Delivery rate setting  
Maximum quantity of 
seeds in hopper  Intermediate quantity 
of seeds in hopper  Minimum quantity of 
seeds in hopper  
1 1/2 1/8 1 1/2 1/8 1 1/2 1/8 DRS 272: 2015  
9                ©RSB 2021  - All rights reserved  
 B 1.2.1 Hand -operated metering (dibbler, jabber)  
B1.2.1.1 Number of seeds delivered by one hand 
action           
B1.2.1.2 Estimated delivery rate,  
kg/ha at  
row spacing, mm  
hill distance, mm  
          
         
         
B1.2.1.3 Rate of damaged seed by metering 
mechanism, %           
B1.2.2 Ground wheel -driven metering  
B1.2.2.1 Effective rolling diameter of ground 
wheel, m           
B1.2.2.2 Revolution of ground wheel  for 
measuring delivery           
B1.2.2.3 Delivery for B1.2.2.2, kg           
B1.2.2.4 Delivery rate, kg/ha           
B1.2.2.5 Rate of damaged seeds by metering 
mechanism           
B1.2.2.6 Observations           
B1.2.3 PTO -driven metering  
B1.2.3.1 PTO speed, rpm           
B1.2.3.2Tractor travelling speed in relation to 
B1.2.2.1, m/s           
B1.2.3.3 Time for measuring delivery, s           
B1.2.3.4 Delivery for B1.2.2.3,kg           
B1.2.3.5 Delivery rate, kg/ha           
B1.2.3.6 Quantity of damaged seeds by metering 
mechanism, %           
B1.2.4 Pattern of seed deposition (line, band, hill, 
single seed, precision planting)           
B.2 Fertilizer metering  
Date of test :....................................................  
B2.1 Test condition  
B2.1.1 Conditions of fertilizer  
B2.1.1.1 Kind:................................  
B2.1.1.2 Name :.,................................  
B2.1.1.3 Moisture content,%db:....................................  
B2.1.1.4 Bulk density, kg/L:....................................   
©RSB 2012  - All rights reserved                  10 
 B2.1.2 Condition of grain seeder  
B2.1.2.1 Metering shaft speed adjustment (if any):..... ........................................  
B2.1.2.2 Mechanism and speed:...................................................................  
B2.1.2.3 Delivery opening adjustment:.....................................  
B2.2 Delivery rate  
Particulars  Delivery rat e setting  
Maximum quantity of 
fertilizer in hopper  Intermediate quantity 
of fertilizer in hopper  Minimum quantity of 
fertilizer in hopper  
1 1/2 1/8 1 1/2 1/8 1 1/2 1/8 
B 2.2.1 Ground wheel -driven metering  
B2.2.1.1 Effective rolling diameter of ground  
wheel, m           
B2.2.1.2 Revolution of ground wheel for 
measuring delivery           
B2.2.1.3 Delivery of B2.2.1.2, kg           
B2.2.1.4 Delivery rate, kg/ha           
B2.2.1.5 Observations           
B2.2.2 PTO -driven metering  
B2.2.2.1 PTO speed, rpm           
B2.2.2.2Tractor travelling speed in relation to 
B2.2.2.1, m/s           
B2.2.2.3 Time for measuring delivery, s           
B2.2.2.4 Delivery rate, kg/ha           
B2.2.2.5 Observations           
B2.2.3 Pattern of seed deposition (line, 
band,spaced,etc)           
 
 
 
 
 
 
 
 
 
 DRS 272: 2015  
11                ©RSB 2021  - All rights reserved  
 Annex  C 
(informative)  
 
Field performance test data sheet  
 Table C.1 — Items to be inspected   
Particulars  Test number  
1 2 3 Ave. 
Date of test  
C1 Test condition  
C1.1 Condition of seed  
C1.1.1 Name      
C1.1.2 Variety      
C1.1.3 Shape      
C1.1.4 Size      
C1.1.4.1 Length, mm      
C1.1.4.2 Width, mm      
C1.1.4.3 Thickness, mm      
C1.1.5 Weight of 1000 seeds, g      
C1.1.6 Moisture content, %wb      
C1.1.7 Bulk density, kg/l      
C1.1.8 Germination rate, %      
C1.2 Condition of fertilizer  
C1.2.1 Name      
C1.2.2 Kind      
C1.2.3 Moisture content, %db      
C1.2.4 Bulk density, kg/L      
C1.3 Condition of field  
C1.3.1 Location      
C1.3.2 Field type and soil condition      
C1.3.3 Length, m      
C1.3.4 Width, m      
C1.3.5 Area, m2     
C1.3.6 Shape      
C1.3.7 Method of land preparation      
C1.3.8 Distribution of soil particles in seedbed      
C1.3.9 Soil moisture content, %db      
C1.3.10 Bulk density of soil, kg/m3      
©RSB 2012  - All rights reserved                  12 
 C1.3.11 Penetrometer profile and cone index in depth of 
seeding in case of no -land preparation      
C1.4 Condition of operation  
C1.4.1 Raw spacing, mm      
C1.4.2 Seed rate, kg/ha      
C1.4.3 Depth of seeding, mm      
C1.4.4 Fertilizer rate, kg/ha      
C1.5 Condition of metering mechanism  
C1.5.1 Metering shaft speed adjustment (if any)      
C1.5.2 delivery opening adjustment      
C1.6 Condition of power source  
C1.6.1 Draft animal      
C1.6.1.1 Breed      
C1.6.1.2 Number      
C1.6.2 Power tiller or tractor      
C1.6.2.1 Make and model      
C1.6.2.2 Rated engine horsepower, kW      
C1.6.2.3 Rated drawbar horsepower, kW      
C1.6.2.4 Gear shift setting      
C1.6.2.5 PTO speed, rpm (if used)      
C1.6.2.6 Speed of rotary tiller, rpm (if used)      
C2 Field performance  
C2.1 Actual operating time, min      
C2.2 Time lost owing to      
C2.2.1 Turning at headland, min      
C2.2.2Adjustment, min      
C2.2.3 Refilling of seed/fertilizer, min      
C2.2.4 Repair, min      
C2.3 Actual area covered, m2     
C2.4 Effective working width(no. Of rows × row spacing), 
m     
C2.5 Travelling speed, m/s      
C2.6 Effective field capacity, ha/h      
C2.7 Field efficiency, %      
C2.8 Travel pattern      
C2.9 width of headland, m      
C2.10 Wheel slip, %      
C2.11 Fuel consumption  
L/h 
L/ha     DRS 272: 2015  
13                ©RSB 2021  - All rights reserved  
 C2.12 Depth of seeding, mm      
C2.13 In case of hill  planting  
Distance between hills, mm  
Number of seeds per hill  
Missing hills,%      
C2.14 In case of drill  
No. Of seeds sown per area      
C2.15 Comments and observations on the following:  
C2.15.1 ease of operation  in travelling straight 
path......................................................................................................................... ..............................................................
.... 
C2.15.2 Ease of turning................ ..........................................  
C2.15.3 Ease of refilling seed and fertilizer....................................................................  
C2.15.4 Ease of replacing and adjusting the parts........................................................  
C2.15.5 Safety features........................... .............  
C2.15.6 Failure or abnormalities that may be observed on the tractor or its component parts ……………………….  
C2.15.7 Others ………………………… ………………………………………………………………………………………  
 
 
 
 
 
 
 
 
 
 
 
 
  
©RSB 2012  - All rights reserved                  14 
 Annex  D 
(informative)  
 
Formulas used during calculations and testing  
D.1 Field performance test  
D.1.1  Delivery rate  
D.1.1.1  Nominal working width, W, m  
𝑊=𝑛×𝑑𝑟 
where 
 W is the nominal working width, m ; 
n is the number of rows ; 
dr is the row spacing . 
D.1.1.2  Ground wheel -driven machine  
D 1.1.2.1  Effective diameter of ground wheel under load  
𝐷𝑒=𝑑
𝜋×𝑁 
where  
De is the effective diameter, m ; 
N is the number of revolutions, rpm ; 
D is the distance for a given N, m. 
D 1.1.2.2  Delivery rate  
𝑄=𝐿×10,000
𝜋𝐷𝑒×𝑁×𝑊 
where  
Q is the delivery rate, kg/ha ; 
L is the delivery for a given N, kg. 
D.1.1.3  PTO-driven machine  
𝑄=𝐿×10,000
𝑣×𝑡×𝑊 
 DRS 272: 2015  
15                ©RSB 2021  - All rights reserved  
 where 
Q is the delivery rate, kg/ha ; 
L is the delivery for a given N, kg; 
V is the tractor speed, m/s ; 
T is the time for measuring delivery, s . 
D.1.2  effective field capacity, 𝒆𝒇𝒄(m2/h) 
𝑒𝑓𝑐 =𝐴
𝑡 
where  
A is the area covered, m2; 
t  is the time used during the operation, hr . 
D.1.3  Theoretical field capacity,  𝒕𝒇𝒄 (m2/h) 
𝑡𝑓𝑐 =0.36(𝑤×𝑣) 
where 
w is the nominal working width, m ; 
v is the speed of operation, m/s . 
D.1.4  Field efficiency,  𝜺𝒇 
𝜀𝑓=𝑒𝑓𝑐
𝑡𝑓𝑐×100 
where 
𝑒𝑓𝑐 is the effective field capacity, m2/h; 
𝑡𝑓𝑐 is the theoretical field capacity, m2/h. 
D.1.5  Fuel consumption, 𝑭𝑪, (L/h)  
𝐹𝐶=𝑉
𝑡 
where 
V is the volume of fuel consumed, L ; 
T is the total operating time, h . 
 
 DRS 272: 2015  
 
Price based on  15 pages  
©RSB 2015  - All right s reserved