Abstract
Abstract Intercropping is a common practice in developing countries because it may produce higher total yields than monocropping. The objective of this study was to apply intercropping principles to alternative and traditional crops in the USA under mechanized conditions. Although these crops have been examined in intercropping systems, in most cases studies were not conducted with improved varieties found in the USA or in strip widths that can accommodate machinery. A field study was conducted at two central Missouri locations in 1991 and 1992 to determine the effect of intercropping on grain yields of pearl millet [ Pennisetum glaucum (L.) R. Br.], amaranth ( Amaranthus hypochondriacus L. × A. hybridus L.), cowpea [ Vigna unguiculata (L.) Walp.], guar [ Cyamopsis tetragonoloba (L.) Taub.], and soybean [ Glycine max (L.) Merrill]. Treatments were assigned in an incomplete factorial design and consisted of planting pattern (monocrops, narrow and wide row strips, and alternate row intercrops), N fertilizer (0, 56, or 112 kg N ha −1 ), and component crop combination. Each intercrop consisted of a legume (cowpea, soybean, or guar) and a nonlegume (pearl millet or amaranth). In the strip intercrops, only cowpea showed a consistent yield response to planting pattern, with the narrow strip arrangement with amaranth yielding 53 and 39% lower than its monocrop in two environments. Land equivalent ratios of amaranth and pearl millet grown in alternate rows with cowpea were not significantly different from their monocrops. At the Columbia site, yields of alternate row intercrops generally did not increase upon addition of N and in 1992, amaranth yield at 0 kg N ha −1 was 25% higher in the alternate row intercrop than it was at the same N rate in the monocrop. In general, grain yields were similar in the various intercrops compared with monocrops.
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Claims 7
Claim · model-written summary
Cowpea in narrow strips with amaranth yielded 53% less than monocrop in one environment.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- narrow strip arrangement with amaranthe0
- Outcome
- yielde0
- Direction
- lowere0
- Value
- 53e0
- Comparator
- monocrope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the strip intercrops, only cowpea showed a consistent yield response to planting pattern, with the narrow strip arrangement with amaranth yielding 53 and 39% lower than its monocrop in two environments.”
Claim · model-written summary
Cowpea in narrow strips with amaranth yielded 39% less than monocrop in another environment.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- narrow strip arrangement with amaranthe0
- Outcome
- yielde0
- Direction
- lowere0
- Value
- 39%e0
- Comparator
- monocrope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the strip intercrops, only cowpea showed a consistent yield response to planting pattern, with the narrow strip arrangement with amaranth yielding 53 and 39% lower than its monocrop in two environments.”
Claim · model-written summary
amaranth alternate rows with cowpea had land equivalent ratios not significantly different from monocrops.
- Taxon
- amaranth
.JPG?width=60)
Amaranthus caudatuse0 - Treatment
- alternate rows with cowpeae0
- Outcome
- Land equivalent ratiose0
- Direction
- not significantly differente0
- Comparator
- monocropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“Land equivalent ratios of amaranth and pearl millet grown in alternate rows with cowpea were not significantly different from their monocrops.”
Claim · model-written summary
pearl millet alternate rows with cowpea had land equivalent ratios not significantly different from monocrops.
- Taxon
- pearl millet
Cenchrus americanuse0 - Treatment
- alternate rows with cowpeae0
- Outcome
- Land equivalent ratiose0
- Direction
- not significantly differente0
- Comparator
- monocropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Land equivalent ratios of amaranth and pearl millet grown in alternate rows with cowpea were not significantly different from their monocrops.”
Claim · model-written summary
At Columbia, added nitrogen generally did not increase alternate-row intercrop yields.
- Treatment
- addition of Ne0
- Outcome
- yields of alternate row intercropse0
- Direction
- did not increasee0
- Setting
- Columbia sitee0
Not reportedTaxonComparator
Verbatim
e0“At the Columbia site, yields of alternate row intercrops generally did not increase upon addition of N and in 1992, amaranth yield at 0 kg N ha −1 was 25% higher in the alternate row intercrop than it was at the same N rate in the monocrop.”
Claim · model-written summary
Amaranth yield at zero N was 25% higher in alternate rows than monocrop at Columbia in 1992.
- Taxon
- amaranthAmaranthus caudatuse0
- Treatment
- alternate row intercrope0
- Outcome
- amaranth yielde0
- Direction
- highere0
- Value
- 25%e0
- Qualifier
- 0 kg N ha −1e0
- Comparator
- monocrope0
- Setting
- Columbia sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the Columbia site, yields of alternate row intercrops generally did not increase upon addition of N and in 1992, amaranth yield at 0 kg N ha −1 was 25% higher in the alternate row intercrop than it was at the same N rate in the monocrop.”
Claim · model-written summary
Grain yields were generally similar between intercrops and monocrops.
Not reportedTaxon
Verbatim
e0“In general, grain yields were similar in the various intercrops compared with monocrops.”
The same questions in other papers
intercropping · yield · Amaranthus caudatus (amaranth)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.