Abstract
Hemp (Canabis sativa L) has been grown in Southern Africa for medicinal purpose for many centuries, but cultivated during the past half century as an illegal drug crop marijuana, “dagga”. Although this plant was declared illegal in South Africa in 1928, its high fibre content warrants more research for the later purpose. Field experiments were conducted during 2006/2007 and 2007/ 2008 seasons at Addo in the Eastern Cape Province. The objective of the study was to determine the influence of nitrogen fertiliSer rates (0. 50, 100 and 150 kg ha-1) on yield and quality of two hemp cultivars viz, Kompolti and Felina/Novosadska. In 2007/2008 Novosadska was used to replace Felina whose fibre was very short. Treatments were four nitrogen levels (0, 50, 100 and 150 kg ha-1) and hemp cultivars (Kompolti and Felina). Data collected from for two cropping seasons included; wet biomass biomass yield (dry), stem diameter, plant height and fibre percentage. There were significantly higher yields in fertilised units than in the control treatments. The highest plant height, fresh and dry biomass yield were obtained with 100 and 150 kg N ha-1 were applied at Addo during 2006/2007. Higher nitrogen levels tended to have an increasing effect on both yield and plant height in both seasons. Of the two cultivars, kompolti performed better than Felina 35 and Novosadska. For stem diameter, only the cultivar effect was significant, similarly the highest diameters were found at 50 and 100 kg N ha-1 for Kompolti in both seasons. The highest fibre percentage the following data were collected from two cropping seasons; wet biomass,biomass yield (dry), stem diameter, plant height and fibre percentage were obtained at 50 kg N ha-1 in 2006/2007; while in 2007/2008 the highest fibre percentage was observed at 100 and 150 kg N ha-1. Kompolti had higher fibre percentage than other cultivars, also Kompolti showed better response in fibre quality parameters (finess, length, strength and colour) in both season.
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Claims 9
Claim · model-written summary
Fertilised hemp plots yielded significantly more than the control treatments.
- Taxon
- hemp
Cannabis sativa subsp. sativat0 - Treatment
- nitrogen fertiliSer rates (0. 50, 100 and 150 kg ha-1)e2
- Outcome
- yieldse0
- Direction
- highere0
- Comparator
- control treatmentse0
- Setting
- Addo in the Eastern Cape Provincee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e0“There were significantly higher yields in fertilised units than in the control treatments”
e1“Field experiments were conducted during 2006/2007 and 2007/ 2008 seasons at Addo in the Eastern Cape Province”
e2“The objective of the study was to determine the influence of nitrogen fertiliSer rates (0. 50, 100 and 150 kg ha-1) on yield and quality of two hemp cultivars viz, Kompolti and Felina/Novosadska”
Claim · model-written summary
Plant height, fresh biomass yield and dry biomass yield were highest at 100 and 150 kg N ha-1 at Addo in 2006/2007.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- 100 and 150 kg N ha-1e3
- Outcome
- plant height, fresh and dry biomass yielde3
- Direction
- higheste3
- Setting
- Addo during 2006/2007e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e3“The highest plant height, fresh and dry biomass yield were obtained with 100 and 150 kg N ha-1 were applied at Addo during 2006/2007”
Claim · model-written summary
Higher nitrogen levels tended to increase both yield and plant height in both seasons.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- Higher nitrogen levelse4
- Outcome
- yield and plant heighte4
- Direction
- increasinge4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e4“Higher nitrogen levels tended to have an increasing effect on both yield and plant height in both seasons”
Claim · model-written summary
For stem diameter, only the cultivar effect was significant; the nitrogen effect was not.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- cultivare5
- Outcome
- stem diametere5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e5“For stem diameter, only the cultivar effect was significant”
Claim · model-written summary
Stem diameter was highest at 50 and 100 kg N ha-1 for Kompolti in both seasons.
- Taxon
- hempCannabis sativa subsp. sativat0
- Material
- Kompoltie6
- Treatment
- 50 and 100 kg N ha-1e6
- Outcome
- diameterse6
- Direction
- higheste6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e6“the highest diameters were found at 50 and 100 kg N ha-1 for Kompolti in both seasons”
Claim · model-written summary
Kompolti performed better than Felina 35 and Novosadska.
- Taxon
- hempCannabis sativa subsp. sativat0
- Material
- kompoltie7
- Outcome
- performed bettere7
- Direction
- bettere7
- Comparator
- Felina 35 and Novosadskae7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e7“Of the two cultivars, kompolti performed better than Felina 35 and Novosadska”
Claim · model-written summary
Kompolti had a higher fibre percentage than the other cultivars.
- Taxon
- hempCannabis sativa subsp. sativat0
- Material
- Kompoltie7
- Outcome
- fibre percentagee7
- Direction
- highere7
- Comparator
- other cultivarse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e7“Kompolti had higher fibre percentage than other cultivars”
Claim · model-written summary
The highest fibre percentage was obtained at 50 kg N ha-1 in 2006/2007.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- 50 kg N ha-1e2
- Outcome
- fibre percentagee2
- Direction
- higheste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e2“The highest fibre percentage the following data were collected from two cropping seasons; wet biomass,biomass yield (dry), stem diameter, plant height and fibre percentage were obtained at 50 kg N ha-1 in 2006/2007”
Claim · model-written summary
The highest fibre percentage was observed at 100 and 150 kg N ha-1 in 2007/2008.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- 100 and 150 kg N ha-1e2
- Outcome
- fibre percentagee2
- Direction
- higheste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Performance of hemp cultivars”
e2“while in 2007/2008 the highest fibre percentage was observed at 100 and 150 kg N ha-1”
The same questions in other papers
nitrogen · quality: grain · Cannabis sativaPositive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
3 papers more in this group
See all 7 papers →nitrogen · yield · Cannabis sativaPositive and negative results
14 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
12 papers more in this group
See all 16 papers →fertilization · yield · Cannabis sativaPositive and negative results
24 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- no effect
27 papers more in this group
See all 31 papers →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.