Abstract
Core Ideas Rainfed Mediterranean environments might be suitable for double‐purpose hemp production. Hemp is a good predecessor for wheat under rainfed Mediterranean conditions. The beneficial effects of hemp on the subsequent wheat yield appear to last for 2 yr. Monocropping hemp over 2 yr, does not reduce its grain and biomass yields. Hemp ( Cannabis sativa L.) has a low impact on the environment requiring few added resources, and has multiple downstream applications. There is little information on hemp biomass, seed yields, and response to NPK fertilization under humid rainfed Mediterranean conditions. Moreover, the effects of hemp on subsequent wheat ( Triticum aestivum L.) crops have not been determined. To address these issues, we performed a field study for 6 yr in Catalonia (northeastern Spain). Hemp treatments included: hemp monoculture, unfertilized hemp succeeding wheat, and NPK‐fertilized hemp succeeding wheat. In turn, wheat treatments included: wheat monoculture, first‐, second‐, and third‐year wheat succeeding unfertilized hemp, and first‐, second‐, and third‐year wheat succeeding NPK‐fertilized hemp. The hemp biomass yields (5340–10,090 kg ha −1 ) were similar to or lower than those achieved in other European regions whereas the hemp seed yields were relatively high (604–1434 kg ha −1 ). Both the biomass yield and seed yield greatly increased with NPK fertilization. The rotation effects of hemp on the subsequent wheat crops increased the wheat yield by 1368 and 155 kg ha −1 in the first and second years, respectively, but in the third year the yield was similar to the wheat monoculture. The beneficial effects of hemp on wheat therefore appear to last for 2 yr. We conclude that dual‐purpose hemp (harvested for fiber and seed) is an excellent predecessor for wheat, improving the sustainability of cereal‐based cropping systems under humid rainfed Mediterranean conditions.
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Claims 9
Claim · model-written summary
Hemp biomass yields of 5340–10,090 kg ha −1 were similar to or lower than yields elsewhere in Europe.
- Taxon
- hemp
Cannabis sativa subsp. sativae0 - Outcome
- biomass yieldse0
- Direction
- similar to or lowere0
- Value
- 5340–10,090 kg ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hemp biomass yields (5340–10,090 kg ha −1 ) were similar to or lower than those achieved in other European regions”
Claim · model-written summary
Hemp seed yields of 604–1434 kg ha −1 were relatively high.
- Taxon
- hempCannabis sativa subsp. sativat0
- Outcome
- seed yieldse0
- Direction
- relatively highe0
- Value
- 604–1434 kg ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hemp seed yields were relatively high (604–1434 kg ha −1 ).”
t0“Hemp Yields”
Claim · model-written summary
NPK increased hemp biomass yield.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- NPK fertilizatione0
- Outcome
- biomass yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the biomass yield and seed yield greatly increased with NPK fertilization.”
t0“Hemp Yields”
Claim · model-written summary
NPK increased hemp seed yield.
- Taxon
- hempCannabis sativa subsp. sativat0
- Treatment
- NPK fertilizatione0
- Outcome
- seed yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the biomass yield and seed yield greatly increased with NPK fertilization.”
t0“Hemp Yields”
Claim · model-written summary
Hemp rotation increased first year wheat yield by 1368 kg ha −1.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- hempe0
- Outcome
- wheat yielde0
- Direction
- increasede0
- Value
- 1368e0
- Comparator
- wheat monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rotation effects of hemp on the subsequent wheat crops increased the wheat yield by 1368 and 155 kg ha −1 in the first and second years, respectively, but in the third year the yield was similar to the wheat monoculture.”
Claim · model-written summary
Hemp rotation increased second year wheat yield by 155 kg ha −1.
- Taxon
- wheatTriticum aestivume0
- Treatment
- hempe0
- Outcome
- wheat yielde0
- Direction
- increasede0
- Value
- 155 kg ha −1e0
- Comparator
- wheat monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rotation effects of hemp on the subsequent wheat crops increased the wheat yield by 1368 and 155 kg ha −1 in the first and second years, respectively, but in the third year the yield was similar to the wheat monoculture.”
Claim · model-written summary
Third year wheat yield after hemp was similar to monoculture.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Hempt0
- Outcome
- yielde0
- Direction
- similare0
- Comparator
- wheat monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the third year the yield was similar to the wheat monoculture.”
t0“Hemp Yields and Its Rotation Effects on Wheat”
Claim · model-written summary
Two years of hemp monocropping did not reduce its grain or biomass yields.
- Taxon
- hempCannabis sativa subsp. sativae0
- Treatment
- Monocropping hemp over 2 yre0
- Outcome
- grain and biomass yieldse0
- Direction
- does not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Monocropping hemp over 2 yr, does not reduce its grain and biomass yields.”
Claim · model-written summary
The authors conclude dual purpose hemp is an excellent wheat predecessor.
- Taxon
- wheatTriticum aestivume0
- Outcome
- excellent predecessor for wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dual‐purpose hemp (harvested for fiber and seed) is an excellent predecessor for wheat, improving the sustainability of cereal‐based cropping systems under humid rainfed Mediterranean conditions.”
The same questions in other papers
Cannabis sativa subsp. sativa · yield · Triticum aestivum (wheat)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
2 papers more in this group
See all 6 papers →rotation · yield · Cannabis sativaPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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.