Irrigation

WATER POWERED DOSING TECHNOLOGYfertigation andchemigationThe objectives of fertigation are tocontrol water quantities and addednutrients necessary for optimumgrowth of crops.Dosatron offers a constant injectionratio and uniform and proportionalinjection, adding flexibility to simpleor automated systems, so that theproducer can very easily take actionwhenever he considers it necessary.Waterpoweredvolumetricproportionaldosing

Advantagesof the fertigation■ Significantly better agronomicefficiency by simultaneous supplyof water and minerals.■ Small but numerous applicationsof nutrients to best satisfy thedifferent needs of crops.■ Limitation of "leaching"due to small but frequentadditions of nutrients.■ Application of nutrientsolutions through theirrigation system, providinghomogenous distributionin the differentparcels.■ Thus, minerals reach theheart of the root system,and crop needs can besatisfied immediately at allstages.■ Savings of water, products andlabor.■ Automation possibilities.Sandfilter300 micronfilterTotal bypass installationsPrinciple of centralized installation (automated or not)SolenoidvalveTankMixerAMixerProgrammerBSolenoid valveNon-returnvalve80 to 120micron filterSector solenoidvalvesPressurereducersDripsystem300micronfilterStocksolutiontank AStocksolutiontank BSprayingnozzleProgrammerConnectorto watercircuitStock solutiondrumSolenoid valvePrinciple of mobilinstallationProgrammerSprinklerheaderAdvantagesof DosatronSandfilter300micronfilterTankSolenoidvalveNonreturnvalve80 to 120micron filterSector solenoidvalvesDripsystem■ Hydraulic, no electricityrequired.■ Precise: Dosing proportionalto the waterflow passing through theDosatron.■ Unlike other systems, proportionaldosing provides uniform distributionof the products over theentire sector(s).■ Dosing and treatments can bechanged at any time withoutchanging the programming ofthe entire irrigation or controlsystem.■ Ease of use and maintenance.■ Flexibility and speed of use(fixed or mobile).ProgrammerPrinciple ofdecentralizedinstallation(automated or not)SolenoidvalveSolenoidvalveMixerNonreturnvalve80 to120 micronfilterStock solution tankMixerStock solutiontankSector solenoidvalvesPressurereducersPressurereducersDrip tape

How to chooseyour DosatronThe choice of the Dosatron essentially depends on therequired irrigation flow.ExampleSoftware forpreparation of the stock solutionfrom water soluble or liquid fertilizersSoftware for fertigation is available in the form of Excel spreadsheets.Basic principle for preparation of the stock solution(from water soluble fertilizers):1 st sector:3000 2 l/h drippersManualvalvesNonreturnvalve2 nd sector:1000 2 l/h drippersIrrigationwater%Fertigation water orsub-concentration3 rd sector:2000 2 l/h drippers1. Calculation ofthe required irrigation flowMinimum irrigation flow:Multiply the number of drippers (or sprinklers or nozzles)in the smallest sector by their unit flow:1 000 x 2 l/h= 2 000 l/h = 2 m 3 /hMaximum irrigation flow:Multiply the total number of drippers in all sectors bytheir unit flow:3 000 + 1 000 + 2 000= 6 000 x 2 l/h= 12 000 l/h = 12 m 3 /h2. Choice of the DosatronIts minimum flowIts minimum flow capacity must be equal to or lessthan the required irrigation flow in the smallest sector.E.g.: Sector 2: 2 m 3 /hPossibilities:D 45: 100 l/h to 4.5 m 3 /hD 8 R: 500 l/h to 8 m 3 /hD 20 S: 1 m 3 /h to 20 m 3 /hIts maximum flowPossibilities:1°For simultaneous fertigation of all sectors:Maximum required irrigation flow,namely ≥ 12 m 3 /h:the required Dosatron is the D 20 S, up to 20 m 3 /h2°For fertigation, one sector at a time:Required irrigation flow in the largest sector,namely 3 000 x 2 l/h = 6 000 l/h, namely ≥ 6 m 3 /h:the required Dosatron in the D8R up to 8 m 3 /hNote: it is preferable to choose a Dosatron witha maximum flow capacity higher than the requiredirrigation flow in order to optimize its life.1 literNote: this solution preparation example isgiven for guidance only, and we cannot beresponsible for it. Please call your chemicalsupplier for further information.Recommendations:Adjustment %0.20.40.60.81.01.21.41.61.82.00,52501258363504236312825■ Standards and regulations in force in the countrymust be respected during installation and use onthe drinking water network.■ The installation must comprise a disconnector or anon-return valve upstream the injection system toprevent from any pollution of the water source.■ Install a 300-micron filter upstream the Dosatron,depending on the water quality.Note: the built-in filter in some models is no morethan a final safety device, and it must never be usedto replace the filter upstream.■ For assemblies in parallel, a single stock solutiontank should be used to supply the various Dosatrons.■ Never use an inlet T at the intake to draw in twodifferent solutions.■ The motor is lubricated by water, never apply greaseto the motor.For protection against water hammer, it is recommendedthat:■ Slowly opening and closing solenoid valves shouldbe used.■ If a Dosatron is used to supply several sectors, activatethe solenoid valves simultaneously (close onesector and open another sector at the same time).■ Start irrigation first, and start fertilization (totalbypass installation) only once the whole irrigationsystem is full of water (after a few minutes).Final concentration or sub-concentration in grams/liter0,7518812594756354474238125016712510083716356501.25 1.50 1.7520815612510489787063188150125107948375219175146125109978822001671431251111002.5Fertilizer weight in grams to be placedin a receptacle and topped up to 1 liter(thus the fertilizer density is ignored)250208179156139125The level in the stock solution tank must never behigher than the Dosatron (risk of siphoning).For acid dosing, it is preferable to move the aciddrum away from the Dosatron and put a cover onthe drum.Note: If the weight of acid in the stock solution ismore than 6% and up to 10%, choose a PVDFmodel (see option on page 4).325021418816715042502222005250

fertigation and chemigationOperating principleInstalled directly in the water supply line, theDosatron operates by using the flow of water as thepower source. The water activates the Dosatron,which takes up the required percentage of concentratedirectly from the container and injects it into thewater. Inside the Dosatron, the concentrate is mixedwith the water, and the water pressure forces thesolution downstream. The dose of concentrate will bedirectly proportional to the volume of water enteringthe Dosatron, regardless of variations in flow or pressure,which may occur in the main line.Recommended models*2.5m 3 /h Operating water flow:10 l/h to 2.5 m 3 /href. - injection rate:DI 1500 - 0.07 to 2 %DI 2 - 0.5 to 2 %DI 16 - 0.2 to 1.6 %DI 150 - 1 to 5 %4.5m 3 /h Operating water flow:100 l/h to 4.5 m 3 /href. - injection rate:D 45 RE 1.5 - 0.2 to 1.5 %D 45 RE 3 - 0.5 to 3 %VacuumbreakerThe vacuum breaker at the outletprevents the solution tank fromuncontrolled suction when the irrigationnetwork is not under pressure.It must be installed before theDosatron is put into operation.Pest-controloptionMotorpistonSolutionwater + %additive8m 3 /h Operating water flow:500 l/h to 8 m 3 /href. - injection rate:D 8 R - 0.2 to 2 %D 8 R 150 - 1 to 5 %ClearwaterirrigationDosingpistonConcentratedproduct intakeDosingadjustment (%)20m 3 /h Operating water flow:1 m 3 /h to 20 m 3 /href. - injection rate:D 20 S - 0.2 to 2 %30m 3 /h Operating water flow:10 m 3 /h to 30 m 3 /href. - injection rate:D 30 S - 0.25 to 1.25 %*The PVDF option is needed for pestcontroltreatments, strong acids orchlorine based products.Other Dosatronapplications■ Pest-control *■ Maintenance of networks andirrigation systems■ Acidification*■ Soil disinfection■ Post-harvest treatment■ Conservation and disinfectionof cut flowers■ ...A wide range of dosing unitscombined with a broad choice ofoptions (high flow, micro dosage,highly chemical resistant materials...)means that we can addressall your needs.60DOSATRON INTERNATIONAL S.A.Rue Pascal - B.P. 6 - 33370 TRESSES (BORDEAUX) - FRANCETel. 33 (0)5 57 97 11 11 - Fax. 33 (0)5 57 97 11 29 / 33 (0)5 57 97 10 85e.mail : info@dosatron.com - http://www.dosatron.comS.A. DOSATRON INTERNATIONAL au capital de 3 050 000 EUROS . SIRET BORDEAUX 418826 822 00011 . APE 291B . N¡TVA/VAT : FR96418828822m 3 /h Operating water flow:10 m 3 /h to 60 m 3 /href. - injection rate:D 60 S - 0.1 to 0.65 %*WARNING: Please call your dealer for dosing of corrosiveproducts before use, in order to confirm compatibility withthe Dosatron.CUSTOMER SERVICE - SERVICE CLIENTÈLEThis document does not form a contractual engagementon the part of Dosatron International and is for informationonly. Dosatron International reserves the right to alterproduct specification or appearance without priornotice. © DOSATRON INTERNATIONAL S.A. 2004FA/C2-21- IRRIGATION - GB/10/04Crédit photo de couverture : Vakblad voor de Bloemisterij