Abstract
Hemp currently regains certain importance as fiber, oil and medical crop not least because of its modest requirements of biocides, fertilizer and water. During recent years, crops were exposed to a combination of drought and heat, even in northern Central-Europe. Dynamic responses of photosynthesis and stomatal conductance to these stresses and their persistent effects had been studied, if at all, in controlled environment experiments. Comprehensive field studies on diurnal and long-term net photosynthesis and gas exchange, and yield properties of hemp during a drought prone, high-temperature season in northern Central-Europe are obviously missing. Thus, in whole season field trails, the essential actual physiological (rates of net photosynthesis and transpiration, stomatal conductance, water use efficiencies, ambient and internal CO2 concentrations) and the yield performance of modern high-yielding multi-purpose hemp cultivars, ‘Ivory’ and ‘Santhica 27’, were evaluated under extreme environmental conditions and highly limited soil water supply. This provides comprehensive information on the usability of these cultivars under potential future harsh production conditions. Plants of both cultivars differentially cope with the prevailing climatic and soil water conditions. While ‘Ivory’ plants developed high rates of CO2 gain and established large leaf area per plant in the mid-season, those of ‘Santhica 27’ utilized lower CO2 uptake rates at lower leaf area per plant most time. This and the higher germination success of ‘Santhica 27’ resulted in nearly twice the yield compared to ‘Ivory’. Although stomatal control of CO2 gain was pronounced in both cultivars, higher stomatal limitations in ‘Ivory’ plants resulted in higher overall intrinsic water use efficiency. Cultivation of both hemp cultivars with only basic irrigation during seed germination was successful and without large effects on yield and quality. This was valid even under extremely hot and dry climatic conditions in northern Central Europe.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
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 6
Claim · model-written summary
Hemp cultivar Ivory developed high CO2 gain rates and large leaf area per plant in the mid-season.
- Taxon
- Hemp
Cannabis sativa subsp. sativat0 - Material
- Ivorye0
- Outcome
- high rates of CO2 gain and established large leaf area per plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“‘Ivory’ plants developed high rates of CO2 gain and established large leaf area per plant in the mid-season”
t0“Hemp”
Claim · model-written summary
Hemp cultivar Santhica 27 had lower CO2 uptake rates at lower leaf area per plant most of the time.
- Taxon
- HempCannabis sativa subsp. sativat0
- Material
- Santhica 27e0
- Outcome
- lower CO2 uptake rates at lower leaf area per plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those of ‘Santhica 27’ utilized lower CO2 uptake rates at lower leaf area per plant most time”
t0“Hemp”
Claim · model-written summary
Hemp cultivar Santhica 27, with higher germination success, gave nearly twice the yield of Ivory.
- Taxon
- HempCannabis sativa subsp. sativat0
- Material
- Santhica 27e0
- Outcome
- yielde0
- Direction
- higherinferrede0
- Value
- nearly twicee0
- Comparator
- Ivorye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher germination success of ‘Santhica 27’ resulted in nearly twice the yield compared to ‘Ivory’”
t0“Hemp”
Claim · model-written summary
Stomatal control of CO2 gain was pronounced in both hemp cultivars.
- Taxon
- HempCannabis sativa subsp. sativat0
- Outcome
- stomatal control of CO2 gaine0
- Qualifier
- pronounced in both cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stomatal control of CO2 gain was pronounced in both cultivars”
t0“Hemp”
Claim · model-written summary
Higher stomatal limitations in Ivory plants resulted in higher overall intrinsic water use efficiency.
- Taxon
- HempCannabis sativa subsp. sativat0
- Material
- Ivorye0
- Outcome
- higher overall intrinsic water use efficiencye0
- Qualifier
- higher stomatal limitationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher stomatal limitations in ‘Ivory’ plants resulted in higher overall intrinsic water use efficiency”
t0“Hemp”
Claim · model-written summary
Cultivation of both hemp cultivars with only basic irrigation during seed germination was successful and without large effects on yield and quality, even under extremely hot and dry conditions.
- Taxon
- HempCannabis sativa subsp. sativat0
- Treatment
- only basic irrigation during seed germinatione0
- Outcome
- yield and qualitye0
- Direction
- without large effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivation of both hemp cultivars with only basic irrigation during seed germination was successful and without large effects on yield and quality”
t0“Hemp”
The same questions in other papers
irrigation · quality: general · Cannabis sativaResults agree
1 paper in the same direction as this paper
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.