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Regulation of Vapor Pressure Deficit by Greenhouse Micro-Fog Systems Improved Growth and Productivity of Tomato via Enhancing Photosynthesis during Summer Season.

Zhang D, Zhang Z, Li J, Chang Y, Du Q, Pan T - PLoS ONE (2015)

Bottom Line: These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant.Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity.Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

View Article: PubMed Central - PubMed

Affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China.

ABSTRACT
The role of a proposed micro-fog system in regulating greenhouse environments and enhancing tomato (Solanum lycopersicum L.) productivity during summer season was studied. Experiments were carried out in a multi-span glass greenhouse, which was divided into two identical compartments involving different environments: (1) without environment control and (2) with a micro-fog system operating when the air vapor pressure deficit (VPD) of greenhouse was higher than 0.5 KPa. The micro-fog system effectively alleviated heat stress and evaporative demand in the greenhouse during summer season. The physiologically favourable environment maintained by micro-fog treatment significantly enhanced elongation of leaf and stem, which contributed to a substantial elevation of final leaf area and shoot biomass. These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant. Relative growth rate (RGR) of micro-fog treatment was also significantly higher than control plants, which was mainly determined by the substantial elevation in net assimilation rate (NAR), and to a lesser extent caused by leaf area ratio (LAR). Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity. Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

No MeSH data available.


Related in: MedlinePlus

Scheme of the greenhouse and micro-fog system installation.(a)Schematic description of the micro-fog system, (b) top view of the greenhouse compartments.
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pone.0133919.g001: Scheme of the greenhouse and micro-fog system installation.(a)Schematic description of the micro-fog system, (b) top view of the greenhouse compartments.

Mentions: Tomato plants (Cultivar: JinPeng) were grown in a six-span glass greenhouse (south-north oriented). The greenhouse-dimensions were 36m in length and 54m in width, the height was 5.6 m from ground to the gutter (Fig 1). The cultivation system was a rock bed and the distance between bed centers was 1.8 m. The cultivation bed consisted of D-shaped pots of 250 ml volume with a 10cm space. The nutrient solution of same standard composition was supplied to plants via a fertigation system. Irrigation was automatically controlled by a fertirrigation computer. Plants were transplanted at four-leaf stage on July 11 in 2014 and cultivated with single-truss, making it possible to realize a systematic year-round production. The planting density is 6 plants per m2.


Regulation of Vapor Pressure Deficit by Greenhouse Micro-Fog Systems Improved Growth and Productivity of Tomato via Enhancing Photosynthesis during Summer Season.

Zhang D, Zhang Z, Li J, Chang Y, Du Q, Pan T - PLoS ONE (2015)

Scheme of the greenhouse and micro-fog system installation.(a)Schematic description of the micro-fog system, (b) top view of the greenhouse compartments.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519188&req=5

pone.0133919.g001: Scheme of the greenhouse and micro-fog system installation.(a)Schematic description of the micro-fog system, (b) top view of the greenhouse compartments.
Mentions: Tomato plants (Cultivar: JinPeng) were grown in a six-span glass greenhouse (south-north oriented). The greenhouse-dimensions were 36m in length and 54m in width, the height was 5.6 m from ground to the gutter (Fig 1). The cultivation system was a rock bed and the distance between bed centers was 1.8 m. The cultivation bed consisted of D-shaped pots of 250 ml volume with a 10cm space. The nutrient solution of same standard composition was supplied to plants via a fertigation system. Irrigation was automatically controlled by a fertirrigation computer. Plants were transplanted at four-leaf stage on July 11 in 2014 and cultivated with single-truss, making it possible to realize a systematic year-round production. The planting density is 6 plants per m2.

Bottom Line: These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant.Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity.Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

View Article: PubMed Central - PubMed

Affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China.

ABSTRACT
The role of a proposed micro-fog system in regulating greenhouse environments and enhancing tomato (Solanum lycopersicum L.) productivity during summer season was studied. Experiments were carried out in a multi-span glass greenhouse, which was divided into two identical compartments involving different environments: (1) without environment control and (2) with a micro-fog system operating when the air vapor pressure deficit (VPD) of greenhouse was higher than 0.5 KPa. The micro-fog system effectively alleviated heat stress and evaporative demand in the greenhouse during summer season. The physiologically favourable environment maintained by micro-fog treatment significantly enhanced elongation of leaf and stem, which contributed to a substantial elevation of final leaf area and shoot biomass. These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant. Relative growth rate (RGR) of micro-fog treatment was also significantly higher than control plants, which was mainly determined by the substantial elevation in net assimilation rate (NAR), and to a lesser extent caused by leaf area ratio (LAR). Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity. Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

No MeSH data available.


Related in: MedlinePlus