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The objectives of fertigation are to

control water quantities and added

nutrients necessary for optimum growth

of crops.

Dosatron offers a constant injection

ratio and uniform and proportional

injection, adding flexibility to simple orautomated systems, so that the producer

can very easily take action whenever he

considers it necessary.

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Total bypass installations

Advantagesof the fertigation

I Significantly better agronomic

efficiency by simultaneous

supply of water and minerals.

I Small but numerous applications

of nutrients to best satisfy the dif-

ferent needs of crops.

I Limitation of leaching due to

small but frequent additions of

nutrients.

I Application of nutrient solutions

through the irrigation system, pro-

viding homogenous distribution in

the different parcels.

I Thus, minerals reach the heart of

the root system, and crop needs

can be satisfied immediately at

all stages.

I Savings of water, products and labor.I Automation possibilities.

I Hydraulic, no electricity required

I Precise: Dosing proportional to the water flow passing

through the Dosatron

I Unlike other systems, proportional dosing provides

uniform distribution of the products over the entire

sector(s).

I Dosing and treatments can be changed at any time

without changing the programming of the entire

irrigation or control system.

I Ease of use and maintenance.

I Flexibility and speed of use (fixed or mobile).

BA

Advantages of Dosatron

Principle of mobileinstallation

Principle of centralized installation (automated or not)

Principle of decentralized installation (automated or not)

300 micronfilter

80 to 120micron filter

Non-returnvalve

Sand filter Tank Timer

Solenoid valve

Stocksolutiontank A

Stocksolutiontank B

Mixer

Sector solenoidvalves

Dripsystem

Pressurereducers

Stocksolution

drum

300micron filter

Sprayingnozzle

Connectorto watercircuit

Mixer

Solenoid valve

Timer

TankSand filter

300micron filter

Solenoid valve

Timer

Timer

80 to 120micron filter

Non-returnvalve

Pressurereducers Drip

system

Solenoid valve

Spray boom

Sectorsolenoid valves

Non-returnvalve

Mixer

Sectorsolenoid valves

80 to120 micron

filter

Stocksolution

tank

Stocksolution

tank

Pressurereducers

Drip tape

Pressurereducers

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0,5

250

125

83

63

50

42

36

31

28

25

0,75

188

125

94

75

63

54

47

42

38

1

250

167

125

100

83

71

63

56

50

1.25

208

156

125

104

89

78

70

63

1.50

188

150

125

107

94

83

75

1.75

219

175

146

125

109

97

88

2

200

167

143

125

111

100

2.5

250

208

179

156

139

125

3

250

214

188

167

150

4

250

222

200

5

250

Final concentration or daughter solution in grams/liter

Adjustment%

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

Fertilizer weight in grams to be placedin a receptacle and topped up to 1 liter

(thus the fertilizer density is ignored)

Irrigationwater

%

1 liter

Note: this solution preparation exampleis given for guidance only, and we cannotbe responsible for it. Please call yourchemical supplier for further information.

Fertigation water orsub-concentration

The choice of the Dosatron essentially depends on the

required irrigation flow.

Example

1. Calculationof the 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 m3/h

Maximum irrigation flow:

Multiply the total number of drippers in all sectors by

their unit flow:

3 000 + 1 000 + 2 000

= 6 000 x 2 l/h

= 12 000 l/h = 12 m3/h

2. Choice of the DosatronIts minimum flow

Its minimum flow capacity must be equal to or less than

the required irrigation flow in the smallest sector.

E.g.: Sector 2: 2 m3/h

Possibilities:

D 45: 100 l/h to 4.5 m3/h

D 8 R: 500 l/h to 8 m3/h

D 20 S: 1 m3/h to 20 m3/h

Its maximum flow

Possibilities:

1 For simultaneous fertigation of all sectors:

Maximum required irrigation flow,

namely ! 12 m3/h:

the required Dosatron is the D 20 S, up to 20

m3/h

2 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 m3

/h:The required Dosatron in the D8R up to 8 m 3/h

Note: it is preferable to choose a Dosatron with a

maximum flow capacity higher than the required

irrigation flow in order to optimize its life.

Basic principle for preparation of the stock solution(from water soluble fertilizers):

Software for preparation of the stock solutionfrom water soluble or liquid fertilizers

Software for fertigation is available in the form of Excel spreadsheets.

Recommendations:

I Standards and regulations in force in the country

must be respected during installation and use on

the drinking water network.

I The installation must comprise a disconnector or

a non-return valve upstream the injection system

to prevent from any pollution of the water source.

I Install a 300-micron filter upstream the Dosatron,

depending on the water quality.

Note: the built-in filter in some models is no more

than a final safety device, and it must never be usedto replace the filter upstream.

I For assemblies in parallel, a single stock solution

tank should be used to supply the various Dosatrons.

I Never use an inlet T at the intake to draw in two

different solutions.

I The motor is lubricated by water, never apply

grease to the motor.

How to choose your Dosatron

1st sector:3000 2 l/h drippers

Non-returnvalve

Manualvalves

2nd sector:1000 2 l/h drippers

3rd sector:2000 2 l/h drippers

For protection against water hammer, it is

recommended that:

I Slowly opening and closing solenoid valves

should be used.

I If a Dosatron is used to supply several sectors,

activate the solenoid valves simultaneously

(close one sector and open another sector at

the same time).

I Start irrigation first, and start fertilization(total bypass installation) only once the whole

irrigation system is full of water (after a few

minutes).

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