Abstract
Mixed intercropping of spring barley ( Hordeum vulgare L.) with field pea ( Pisum sativum L.), faba bean ( Vicia faba var. minor L.) or narrow-leafed lupin ( Lupinus angustifolius L.) was compared with sole cropping in two field experiments at different locations, on a sandy loam soil and a sandy soil, in Denmark in 2001. Grain legumes were dominant in intercrops on the sandy loam soil, except for lupin, whereas barley was dominant in intercrops on the sandy soil site. Combined intercrop grain yields were comparable to grain yields of the respective sole cropped grain legume or sole cropped, fertilized barley on each soil site. On the sandy loam soil, pea–barley and faba bean–barley intercrops increased the proportion of plant N derived from N 2 fixation in grain legumes and increased the barley grain N concentration (from 1·7 to 2·2 mg/g) compared with sole cropping. However, the later maturity of faba bean compared with barley caused problems at harvest. The grain N concentration of intercropped barley was increased where grain legumes were the dominant intercrops and not on the sandy soil site. Lupin-barley intercrops did not show intercropping advantages to the same degree as faba bean and pea, but lupin constituted a more stable yield proportion of the combined intercrop yield over locations. Furthermore, the study indicated that the natural 15 N abundance at certain locations might not always be sufficient to ensure a reliable estimate of N 2 fixation using the 15 N natural abundance method.
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Claims 10
Claim · model-written summary
Grain legumes were dominant in intercrops on the sandy loam soil, except for lupin.
Verbatim
e1“Grain legumes were dominant in intercrops on the sandy loam soil, except for lupin, whereas barley was dominant in intercrops on the sandy soil site”
Claim · model-written summary
Barley was dominant in intercrops on the sandy soil site.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Outcome
- dominant in intercropse1
- Setting
- sandy soil sitee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“Grain legumes were dominant in intercrops on the sandy loam soil, except for lupin, whereas barley was dominant in intercrops on the sandy soil site”
Claim · model-written summary
Combined intercrop grain yields were comparable to sole-cropped grain legume or fertilized barley yields.
- Taxon
- spring barleyHordeum vulgaree0
- Treatment
- Mixed intercroppinge0
- Outcome
- Combined intercrop grain yieldse2
- Direction
- comparablee2
- Comparator
- sole cropped grain legume or sole cropped, fertilized barleye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mixed intercropping of spring barley ( Hordeum vulgare L.) with field pea ( Pisum sativum L.)”
e2“Combined intercrop grain yields were comparable to grain yields of the respective sole cropped grain legume or sole cropped, fertilized barley on each soil site”
Claim · model-written summary
Pea-barley and faba bean-barley intercrops increased the proportion of plant N from N2 fixation in grain legumes on the sandy loam soil.
Verbatim
e3“On the sandy loam soil, pea–barley and faba bean–barley intercrops increased the proportion of plant N derived from N 2 fixation in grain legumes and increased the barley grain N concentration (from 1·7 to 2·2 mg/g) compared with sole cropping”
Claim · model-written summary
Pea-barley and faba bean-barley intercrops increased barley grain N concentration on the sandy loam soil, from 1.7 to 2.2 mg/g.
- Taxon
- barleyHordeum vulgaree3
- Treatment
- pea–barley and faba bean–barley intercropse3
- Outcome
- barley grain N concentratione3
- Direction
- increasede3
- Value
- 1·7 to 2·2 mg/ge3
- Comparator
- sole croppinge3
- Setting
- sandy loam soile3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“On the sandy loam soil, pea–barley and faba bean–barley intercrops increased the proportion of plant N derived from N 2 fixation in grain legumes and increased the barley grain N concentration (from 1·7 to 2·2 mg/g) compared with sole cropping”
Claim · model-written summary
Barley grain N concentration increased where grain legumes were the dominant intercrops, but not on the sandy soil site.
- Taxon
- barleyHordeum vulgaree5
- Treatment
- where grain legumes were the dominant intercropse5
- Outcome
- grain N concentration of intercropped barleye5
- Direction
- increasede5
- Qualifier
- not on the sandy soil sitee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The grain N concentration of intercropped barley was increased where grain legumes were the dominant intercrops and not on the sandy soil site”
Claim · model-written summary
The later maturity of faba bean caused problems at harvest.
- Taxon
- faba bean
Vicia fabae4 - Outcome
- problems at harveste4
- Qualifier
- later maturity of faba bean compared with barleye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“However, the later maturity of faba bean compared with barley caused problems at harvest”
Claim · model-written summary
Lupin-barley intercrops showed lower intercropping advantages than faba bean and pea intercrops.
Verbatim
e6“narrow-leafed lupin ( Lupinus angustifolius L.)”
e7“Lupin-barley intercrops did not show intercropping advantages to the same degree as faba bean and pea”
Claim · model-written summary
Lupin gave a more stable yield proportion of the combined intercrop yield over locations.
LupinusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lupin constituted a more stable yield proportion of the combined intercrop yield over locations”
Claim · model-written summary
The natural 15N abundance method may not always give a reliable estimate of N2 fixation at some locations.
- Taxon
- spring barleyHordeum vulgaree0
- Outcome
- reliable estimate of N 2 fixatione1
- Qualifier
- at certain locationse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mixed intercropping of spring barley ( Hordeum vulgare L.) with field pea ( Pisum sativum L.)”
e1“the natural 15 N abundance at certain locations might not always be sufficient to ensure a reliable estimate of N 2 fixation using the 15 N natural abundance method”
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See all 11 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.