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Roses

Roses. Application of the Phytomonitoring techniques for adjustment and validation of climate and irrigation regimes. Phytech Ltd. 2003. Phytomonitoring is an operative information channel based on direct measurement of plant condition. Recommended setup for Roses. Data Repeater.

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Roses

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  1. Roses Application of the Phytomonitoring techniques for adjustment and validation of climate and irrigation regimes Phytech Ltd. 2003

  2. Phytomonitoring is an operative information channel based on direct measurement of plant condition

  3. Recommended setup for Roses Data Repeater Solar Radiation Sensor Air Temperature and Humidity Sensor Leaf Temperature Sensor (OPTIONAL) Sap Flow Sensor (OPTIONAL) 2 x Stem Diameter Sensor (0 to 5 mm stroke) Soil Moisture Sensor PhytoGraph™ Software

  4. Greenhouse Roses:The use of the phytomonitoring in climate and irrigation control practice • Adjustment of the Irrigation Rate • Nighttime air dryness effect: diagnostics and control of elimination. • Excess of salinity: diagnostics and control of elimination • Control of growth rate by air temperature. • Dewfall warning and control.

  5. Call for measures: • Negative stem diameter trend • Midday depression of transpiration Adjustment of irrigation schedule Probable cause: Lack of water Trial action: Increased irrigation rate since February 27 Adjustment of the Irrigation Rate (Example 1)

  6. Results of the trial: • Increase of Soil moisture level • Uptrend of stem diameter • Higher transpiration rate • No midday depression of transpiration Adjustment of irrigation schedule Conclusion: Positive effect of new irrigation regime Adjustment of the Irrigation Rate (Example 1)

  7. Call for measures: • Instant response of stem diameter to the daytime watering (2nd daily one) Adjustment of irrigation schedule Probable cause : Lack of water before the 2nd watering Trial action: Three waterings a day with higher daytime rate since November 8 Adjustment of the Irrigation Rate (Example 2)

  8. Results of the trial: • Lesser Diameter contraction amplitude • Uptrend of stem diameter • No instant response of stem diameter to irrigation 55 µ/day 40 µ/day Adjustment of irrigation schedule Conclusion: Positive effect of new irrigation regime Adjustment of the Irrigation Rate (Example 2)

  9. Call for measures: • Depression of stem diameter growth at night Adjustment of irrigation schedule Probable cause : Lack of water at night Trial action : Supplemental nighttime watering since February 18 Nighttime air droughteffect

  10. Results of the trial: • Apparent effect of the first supplemental nighttime watering • Uptrend of stem diameter • Nighttime stem diameter growth Adjustment of irrigation schedule Conclusion: Positive effect of new irrigation regime Nighttime air droughteffect

  11. Call for measures: • Nighttime air dryness • Negative stem diameter trend Adjustment of irrigation schedule Probable cause : Lack of water at night Trial action : Additional nighttime watering on October 15 Soil Moisture not scaled Diagnostics and elimination of the excess of salinity

  12. Results of the trial: • Continued negative stem diameter trend (no effect of the trial action). Adjustment of irrigation schedule Next probable cause: Excess of salinity in substrate Trial action : Flushing of substrate on October 17 Soil Moisture not scaled Diagnostics and elimination of the excess of salinity

  13. Results of the trial: • Uptrend of stem diameter Adjustment of irrigation schedule Conclusion : Flushing was favourable. To repeat if necessary Soil Moisture not scaled Diagnostics and elimination of the excess of salinity

  14. Trunk Soil moisture Adjustment of irrigation schedule Regular flushing based on Phytomonitoring indications Soil Moisture not scaled Diagnostics and elimination of the excess of salinity

  15. Adjustment of climate control Grower’s demand: To slow down stem growth rate on the eve of Valentine Trial action : Air temperature reduced since January 13 Control of growth rate by air temperature

  16. Results of the trial: • No effect on stem diameter trend Adjustment of climate control Grower’s demand: To slow down stem growth rate on the eve of Valentine Trial action : Air temperature reduced since January 13 Control of growth rate by air temperature

  17. Results of the trial : • Deceleration of stem diameter growth rate Adjustment of climate control Next action: Elevated nighttime temperature since January 16 (for reducing net dry matter accumulation) Conclusion: The goal was reached Control of growth rate by air temperature

  18. Dewfall warning and control By comparison of leaf temperature (LT) and dew point temperature (DPT), calculated by PhytoGraph RH Air T DPT Leaf T An example of effective dew control by combination of heating and ventilation. Leaf temperature exceeds DPT despite cooling effect on the leaf. An example of ineffective dew control by combination of heating and ventilation. Leaf temperature is below both air temperature and DPT that may cause dewfall on leaves.

  19. Summary: • The recommended PhyTalk Decision-Support unit (DSU) for greenhouse roses includes the following sensors: • 2 x Trunk diameter sensors (0-5 mm stroke; 1-2 µm resolution) • 1x Leaf temperature sensor (optional) • 1 x Sap flow sensor (optional) • 1 x Solar radiation sensor • 1 x Soil moisture sensors • 1 x Air Temperature and Humidity Sensor • This DSU allows adjusting irrigation and climate regime according to the trunk diameter trend, stem daily contraction and sap flow diurnal curve. • Comparison of the dew point temperature, calculated automatically by PhytoGraph software, with the leaf and air temperature is useful for dewfall control in greenhouses.

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