Precision Agriculture and Decision Support Systems in Horticultural

Crops

Wolfram Spreer

Chiang Mai University

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Precision farming operations

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Precision irrigation

10/11/16Precision Agriculture and Decision Support

Systems in Horticultural Crops3

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Sample collection and geo-referencing

Drying of samples

Soil analyses

Leon Mostacero, 2012

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Descriptive statistics

interpolation

Soil variability maps

Leon Mostacero, 2012

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Solenoid valves

Reference map

Positioning system

Leon Mostacero, 2012

Control system

monitoring

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Actual application

Water use of the machine

Application map

Leon Mostacero, 2012

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Lá

min

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Lámina Aplicada Lámina colectada

Leon Mostacero, 2012

Control and operation

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Control and operation

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• Remote access to data

• Online control and operation

Automated irrigation

Automated irrigation

Greenhouse irrigation

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Automation in greenhouse

Decentrale relais

interface

Remote control via- Internet of things- peer to peer network

Control PC

Analogous input

Temeprature and humidity sensor

Radiation sum

Greenhouse

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Take me Home TomatoPong Yaeng, Chiang Mai

Fertigation

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Sensors for precision irrigation

• Climate data for climatic water balance (T, RH, u, Rad)

• Radiation sum

• Plant based sensors• Leaf temperature (CWSI)

• Sap flow

• Gas exchange

• Chlorophyll fluorescence

• Soil based sensors

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Thermal imaging

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Wiriya-Alongkornunpublished

Drought stress monitoring by root respiration

Experimental set up

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Moisture regime

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Volumetric substrate (sand) water content (SWC) of ten split-root potted longan trees.

Wiriya-Alongkorn et al., 2016

Rootzone CO2 concentration

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Increase in CO2 concentration as indicator for CO2 production by roots and substrate water

content (SWC) on the left side (A) and on the right side (B) of split-root potted longan trees.

Wiriya-Alongkorn et al., 2016

Influence of temperature

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Average daily ambient temperature and CO2 concentration as indicator for CO2

efflux from the rootzone in the control during the time of experiment.

Wiriya-Alongkorn et al., 2016

Continuous Monitoring of CO2

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Spohrer et al., 2016

Need for drainage

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GPS basics

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dGPS

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Water logging management

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Water logging management

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Visualization of flow

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Precise field levelling

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Combined application

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Direct injection

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Precision

Weed-control

23/08/16 Wiriya-Alongkorn et al.: Influence of water supply on CO2 concentration in the rootzone of split-root potted longan trees

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Wegener et al., 2016

Orchard sprayers

• Gap detection

• Recovery

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Pesticide application by UAV

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Pesticide application by UAV

• Promising technology

• Unsuitable to replace field sprayers

• Potential for SE Asia

• Need for dGPS control

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