Spraying and Fertigation
For the selection of the optimum time for spraying and fertigation, the following parameters are taken into account:
Delta T - Optimal Spraying Time
This is the difference in temperature between the dry bulb and the wet bulb.
Low values of △T mean that the atmosphere is highly charged with water, so if spraying is carried out we would have large losses of product through condensation and dripping.
On the other hand, with high values of △T the atmosphere is dry, so if spraying is carried out we would have high product evaporation losses.
- 0-2 °C 🡪 Condensation and drip losses
- 2-8 °C 🡪 Optimum spraying range
- 8-10 °C 🡪 Evaporation losses
- >10 ºC 🡪 Spraying is not recommended
DPV - Optimal Fertigation Timing
It indicates the amount of water vapour in the atmosphere, which is closely linked to crop activity. When the relative humidity of the air is high, the vapour precision deficit will be low and vice versa.
- 4 – 7 kpa 🡪 High humidity, Low plant/atmosphere moisture gradient – NO TRANSPIRATION
- 8 – 12 kpa 🡪 Optimal fertigation range – HIGH RATE OF TRANSPIRATION
- 12 – 16 kpa 🡪 Low relative humidity, closure of stomata by the crop – NO TRANSPIRATION
The following equipment is available to choose the optimum spraying and fertigation time:
Basic station:
nMETOS 80
It includes the following sensors:
- Temperature & Relative air humidity
- Delta T – Optimum Spraying Time
- Dew Point – Frost Protection
- DPV – Optimal Fertigation Timing
Advanced station:
μMETOS Pulverización
It includes the following sensors:
- Temperature & Relative air humidity
- Delta T – Optimum Spraying Time
- Dew Point – Frost Protection
- DPV – Optimal Fertigation Timing
- Wind Speed and Direction – Drift
Possibility of using 30, 40, 60, 80, 90 or 120 cm probes.
Possibility of incorporating a flowmeter or rain gauge.
Possibility of incorporating other climatic sensors