Abstract
Abstract. In a soilless culture, water and nutrients must be frequently and precisely applied due to the reduced volume and low water holding capacity of the substrate. We describe a low-cost and efficient control system for the irrigation management of soilless culture based on an irrigation tray. Both irrigation and drainage volumes from the irrigation control tray are measured automatically. The proposed irrigation scheduling options were based on applying both variable timing and amounts. A Proportional Integral Derivative (PID) algorithm was used to establish the irrigation timing option while two different irrigation application options, based on measurements from the drainage hydrograph, were developed and tested. A field test performed on a tomato crop was carried out to assess the performance of the two irrigation application options. Both irrigation algorithms performed well as they fitted the leaching fraction for every irrigation event to the target value. The fruit yield and quality were comparable to results obtained from the control treatment of the tomato crop. The designed low-cost irrigation control system, if implemented on commercial farms, could prove to be economically very beneficial. Keywords: Automation, Drainage hydrograph, Irrigation control tray, Irrigation scheduling, Proportional-Integral-Derivative (PID) controller, Substrate culture.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Both irrigation algorithms fitted each event’s leaching fraction to the target.
- Taxon
- tomato
Solanum lycopersicume1 - Outcome
- leaching fractione0
- Direction
- fittede0
- Comparator
- target valuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both irrigation algorithms performed well as they fitted the leaching fraction for every irrigation event to the target value”
e1“A field test performed on a tomato crop”
Claim · model-written summary
Fruit yield with the irrigation algorithms was comparable to the control treatment.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- irrigation algorithmse1
- Outcome
- fruit yielde0
- Direction
- comparablee0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fruit yield and quality were comparable to results obtained from the control treatment of the tomato crop”
e1“Both irrigation algorithms performed well”
Claim · model-written summary
Fruit quality with the irrigation algorithms was comparable to the control treatment.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- irrigation algorithmse1
- Outcome
- qualitye0
- Direction
- comparablee0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fruit yield and quality were comparable to results obtained from the control treatment of the tomato crop”
e1“Both irrigation algorithms performed well”
Claim · model-written summary
The authors suggest that the irrigation system could be economically beneficial on commercial farms.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- irrigation control systeme0
- Qualifier
- if implemented on commercial farmse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The designed low-cost irrigation control system, if implemented on commercial farms, could prove to be economically very beneficial”
e1“control treatment of the tomato crop”
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