Liquid Output When Using Drop Hoses

In the case of manual spraying, the spraying pressure must be adjusted as follows in order to spray a specific quantity in liters/hectare:

1. In the spray volume table (see "Adjusting the nozzle output" in this section), find the output per nozzle in l/min, at the desired application rate per hectare and the driving speed in km/h, and divide this value by 2 (on account of the nozzle spacing of 25 cm).

2. Find the spraying pressure in the table with which this output is obtained for the fitted metering disc. Disc CP4916-40 is the standard disc.

3. Multiply the spraying pressure found with the density of the liquid (for AHL 1.28 kg/l). Determine the density by weighing exactly 1 liter.

4. Determine the pressure loss (see "Adjusting the nozzle output" in this section) between pressure gauge and the pressure piece on the drop hose with the liquid fertilizer. The pressure loss is also dependent on the liquid viscosity.

When working with a spraying computer, the liquid output can be set to working with liquid fertilizers as described in the relevant section. If the computer works with a pressure sensor, the density correction factor must be programmed and activated. In addition, the nozzle spacing must be set to 25 cm. If the computer works with a flow sensor, no correction is necessary for the application rate control, but necessary for displaying the correct (calculated) liquid pressure.

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Drop Hose Nozzles Spraying Table

Spraying table metering discs for drop hoses
    Output Dosage in l AHL/ha (nozzle spacing 25 cm)
Metering
disca		 Press.
(bar)		 Water
(l/min)		 AHLb
(l/min)		 6
km/h		 7
km/h		 8
km/h		 9
km/h		 10
km/h		 12
km/h
CP4916-28 0.5 0.16 0.13 52 45 39 35 31 26
  1.0 0.22 0.19 76 65 57 51 46 38
  1.5 0.27 0.24 96 82 72 64 58 48
  2.0 0.32 0.28 112 96 84 75 67 56
CP4916-34 0.5 0.24 0.21 84 72 63 56 50 42
  1.0 0.34 0.30 120 103 90 80 72 60
  1.5 0.41 0.36 144 123 108 96 86 72
  2.0 0.47 0.41 164 141 123 109 98 82
CP4916-40 0.5 0.33 0.29 116 100 87 77 70 58
(standard) 1.0 0.47 0.41 164 141 123 109 98 82
  1.5 0.57 0.50 200 171 150 133 120 100
  2.0 0.66 0.58 232 199 174 155 139 116
CP4916-49 0.5 0.48 0.42 168 144 126 112 101 84
  1.0 0.69 0.61 244 209 183 163 146 122
  1.5 0.82 0.72 288 247 216 192 173 144
  2.0 0.95 0.83 332 285 249 221 199 166
CP4916-59 0.5 0.70 0.61 244 209 183 163 146 122
  1.0 0.99 0.88 352 302 264 235 211 176
  1.5 1.21 1.06 424 363 318 283 254 182
  2.0 1.40 1.23 492 422 369 328 295 211
aOther metering discs on request
bAHL = Ammonium Harnstoff Lösung, density = 1.28 kg/l, concentration 28 wght.- %

 

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