Articles
Analysis of environmental monitoring in greenhouse for the cultivation of mother plants of Cannabis sativa in the Colombian Andes
Article number
1360_33
Pages
259 – 266
Language
English
Abstract
Most Cannabis sativa crops in Colombia are grown in greenhouses to ensure control of the microclimate, pests, and diseases.
The plant requires constant monitoring of environmental variables inside and outside the greenhouse to make appropriate control decisions and increase productivity and reduce costs.
The Semillero de Investigación de Cannabis y Derivados (SICAD), carried out one experiment in a greenhouse of mother plants in the municipality of La Calera, Cundinamarca, Colombia.
Internal variables such as PAR radiation, substrate temperature, and internal and external air variables such as carbon dioxide concentration, temperature, and relative humidity were measured for 20 days.
Other variables, such as the VPD (vapor pressure deficit), were calculated in plants photosynthetically active, i.e., when (PAR) was greater than 100 µmol m‑2 s‑1. It was determined that mother plants are only 35.8% of the time in optimal VPD conditions (0.8-1.4 kPa), 27.0% with low VPD (<0.8 kPa), 22.0% with high VPD (1.4-2 kPa) and 15.3% with very high VPD (>2 kPa) in the greenhouse.
VPD has better performance in plants outside the greenhouse, where 49.4% of the time was in optimal VPD conditions (0.8-1.4 kPa), 36.4% with low VPD (<0.8 kPa), 14.0% with high VPD (1.4-2 kPa). The CO2 concentration in the greenhouse was, on average, 474 ppm with a 17.5% coefficient of variation (CV), and together with the average PAR radiation of 371 µmol m‑2 s‑1 (6 am-4 pm) with a 58.5% CV, suppose limiting factors to increase the photosynthetic rate.
Lack of automation in the irrigation pulses may affect the temperature of the pots, the substrate of the plants after midday registered higher temperatures than those of the air (higher than 30°C), subjecting the roots to thermal stress.
The plant requires constant monitoring of environmental variables inside and outside the greenhouse to make appropriate control decisions and increase productivity and reduce costs.
The Semillero de Investigación de Cannabis y Derivados (SICAD), carried out one experiment in a greenhouse of mother plants in the municipality of La Calera, Cundinamarca, Colombia.
Internal variables such as PAR radiation, substrate temperature, and internal and external air variables such as carbon dioxide concentration, temperature, and relative humidity were measured for 20 days.
Other variables, such as the VPD (vapor pressure deficit), were calculated in plants photosynthetically active, i.e., when (PAR) was greater than 100 µmol m‑2 s‑1. It was determined that mother plants are only 35.8% of the time in optimal VPD conditions (0.8-1.4 kPa), 27.0% with low VPD (<0.8 kPa), 22.0% with high VPD (1.4-2 kPa) and 15.3% with very high VPD (>2 kPa) in the greenhouse.
VPD has better performance in plants outside the greenhouse, where 49.4% of the time was in optimal VPD conditions (0.8-1.4 kPa), 36.4% with low VPD (<0.8 kPa), 14.0% with high VPD (1.4-2 kPa). The CO2 concentration in the greenhouse was, on average, 474 ppm with a 17.5% coefficient of variation (CV), and together with the average PAR radiation of 371 µmol m‑2 s‑1 (6 am-4 pm) with a 58.5% CV, suppose limiting factors to increase the photosynthetic rate.
Lack of automation in the irrigation pulses may affect the temperature of the pots, the substrate of the plants after midday registered higher temperatures than those of the air (higher than 30°C), subjecting the roots to thermal stress.
Authors
J.M. Galindo, P.A. Uribe, L.C. González
Keywords
temperature, vapor pressure deficit, radiation, carbon dioxide, mountain zone, variables, photosynthetically active radiation
Groups involved
- Division Precision Horticulture and Engineering
- Division Plant-Environment Interactions in Field Systems
- Division Vine and Berry Fruits
- Division Tropical and Subtropical Fruit and Nuts
- Division Plant Genetic Resources, Breeding and Biotechnology
- Division Temperate Tree Nuts
- Division Temperate Tree Fruits
- Division Vegetables, Roots and Tubers
- Division Sustaining Horticulture in a Changing World
- Working Group Mechanization, Digitization, Sensing and Robotics
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