Abstract
An accurate moisture control with precise estimation of transpiration of plants is required for low capacity and small size of growing substrate in soilless culture. In this study, a relationship among cumulative transpiration, radiation, vapor pressure deficit, and a relationship between cumulative irrigation and drainage with growth stage were analyzed for development of an optimum irrigation system. Paprika (Capsicum annuum L., cv. Cupura) plants were grown with a plant density of 4.05 plants/m. For obtaining leaf area index (LAI), leaves were sampled every month. The LAI increased from 2.39 to 3.51 for 4 months, reflecting growth stage. Cumulative transpiration was calculated by subtracting the sum of cumulative drainage and an increase in slab weight from cumulative irrigation. Transpiration rate was changed responding proportionally to irradiation. By detailed analysis of transpiration and radiation, cumulative transpiration was regressed well with radiation integral by 2nd-order linear equations in different growth stages, while those with cumulative vapor pressure deficit was regressed by 1st-order linear equations. With increase of LAI, the slopes of cumulative irrigation and drainage curves and the difference between two slopes increased from 0.312 to 0.611, from 0.154 to 0.358, and from 0.158 to 0.253, respectively. In this study, we estimated cumulative transpiration of paprika with several environmental factors according to the plant growth stage and expect this data will contribute to making accurate irrigation strategy based on environmental and growing conditions.
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Claims 7
Claim · model-written summary
Paprika leaf area index increased from 2.39 to 3.51 over four months.
Not reportedTaxon
Verbatim
e0“The LAI increased from 2.39 to 3.51 for 4 months, reflecting growth stage.”
Claim · model-written summary
Transpiration rate changed proportionally with irradiation.
- Outcome
- Transpiration ratee0
Not reportedTaxonSettingDirection
Verbatim
e0“Transpiration rate was changed responding proportionally to irradiation.”
Claim · model-written summary
Cumulative transpiration fitted radiation integral with second-order equations across growth stages.
Not reportedTaxon
Verbatim
e0“cumulative transpiration was regressed well with radiation integral by 2nd-order linear equations in different growth stages”
Claim · model-written summary
Cumulative transpiration fitted cumulative vapor pressure deficit with first-order equations.
Not reportedTaxon
Verbatim
e0“those with cumulative vapor pressure deficit was regressed by 1st-order linear equations.”
Claim · model-written summary
As leaf area index increased, cumulative irrigation slope rose from 0.312 to 0.611.
Not reportedTaxonOrgan / stage
Verbatim
e0“With increase of LAI, the slopes of cumulative irrigation and drainage curves and the difference between two slopes increased from 0.312 to 0.611, from 0.154 to 0.358, and from 0.158 to 0.253, respectively.”
Claim · model-written summary
As leaf area index increased, cumulative drainage slope rose from 0.154 to 0.358.
Not reportedTaxonSetting
Verbatim
e0“With increase of LAI, the slopes of cumulative irrigation and drainage curves and the difference between two slopes increased from 0.312 to 0.611, from 0.154 to 0.358, and from 0.158 to 0.253, respectively.”
Claim · model-written summary
The difference between irrigation and drainage slopes increased from 0.158 to 0.253.
Not reportedTaxonSetting
Verbatim
e0“With increase of LAI, the slopes of cumulative irrigation and drainage curves and the difference between two slopes increased from 0.312 to 0.611, from 0.154 to 0.358, and from 0.158 to 0.253, respectively.”