Abstract
The feasibility of no-tillage in the Cerrado (Savanna-like vegetation of Brazil) depends on the production of sufficient above-ground crop residue, which can be increased by corn-forage intercropping. This study evaluated how above-ground crop residue production and yields of soybean and late-season corn in a soybean-corn rotation were influenced by the following crops in the year before soybean: corn (Zea mays L.) intercropped with Brachiaria (Urochloa) brizantha cv. Marandu, B. decumbens cv. Basilisk, B. ruziziensis, cv. comum., Panicummaximum cv. Tanzânia, sunn hemp (Crotalaria juncea L.), pigeon pea [Cajanus cajan (L.) Millsp]; sole corn, forage sorghum [Sorghum bicolor (L.) Moench (cv. Santa Elisa)], and ruzi grass. In March 2005, corn and forage species were planted in alternate rows spaced 0.90 m apart, and sole forage species were planted in rows spaced 0.45 m apart. In October 2005, the forages were killed with glyphosate and soybean was planted. After the soybean harvest in March 2006, sole late-season corn was planted in the entire experimental area. Corn grain and stover yields were unaffected by intercropping. Above-ground crop residue was greater when corn was intercropped with Tanzania grass (10.7 Mg ha-1), Marandu (10.1 Mg ha-1), and Ruzi Grass (9.8 Mg ha-1) than when corn was not intercropped (4.0 Mg ha-1). The intercropped treatments increased the percentage of soil surface covered with crop residue. Soybean and corn grain yields were higher after sole ruzi grass and intercropped ruzi grass than after other crops. The intercropping corn with Brachiaria spp. and corn with Panicum spp. increases above-ground crop residue production and maintains nutrients in the soil without reducing late-season corn yield and the viability of no-till in the midwestern region of Brazil.
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Claims 9
Claim · model-written summary
Corn grain and stover yields were unaffected by intercropping.
- Taxon
- Corn
Zea mays subsp. mayse0 - Treatment
- intercroppinge0
- Outcome
- Corn grain and stover yieldse0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn grain and stover yields were unaffected by intercropping”
Claim · model-written summary
Above-ground residue was greater with corn intercropped with Tanzania grass (10.7 Mg ha-1) than with sole corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- intercropped with Tanzania grasse0
- Outcome
- Above-ground crop residuee0
- Direction
- greatere0
- Value
- 10.7 Mg ha-1e0
- Qualifier
- 4.0 Mg ha-1e0
- Comparator
- when corn was not intercroppede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above-ground crop residue was greater when corn was intercropped with Tanzania grass (10.7 Mg ha-1), Marandu (10.1 Mg ha-1), and Ruzi Grass (9.8 Mg ha-1) than when corn was not intercropped (4.0 Mg ha-1)”
Claim · model-written summary
Above-ground residue was greater with corn intercropped with Marandu (10.1 Mg ha-1) than with sole corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Marandue0
- Outcome
- Above-ground crop residuee0
- Direction
- greatere0
- Value
- 10.1 Mg ha-1e0
- Qualifier
- 4.0 Mg ha-1e0
- Comparator
- when corn was not intercroppede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above-ground crop residue was greater when corn was intercropped with Tanzania grass (10.7 Mg ha-1), Marandu (10.1 Mg ha-1), and Ruzi Grass (9.8 Mg ha-1) than when corn was not intercropped (4.0 Mg ha-1)”
Claim · model-written summary
Above-ground residue was greater with corn intercropped with Ruzi grass (9.8 Mg ha-1) than with sole corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Ruzi Grasse0
- Outcome
- Above-ground crop residuee0
- Direction
- greatere0
- Value
- 9.8 Mg ha-1e0
- Qualifier
- 4.0 Mg ha-1e0
- Comparator
- when corn was not intercroppede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above-ground crop residue was greater when corn was intercropped with Tanzania grass (10.7 Mg ha-1), Marandu (10.1 Mg ha-1), and Ruzi Grass (9.8 Mg ha-1) than when corn was not intercropped (4.0 Mg ha-1)”
Claim · model-written summary
Intercropped treatments increased the percentage of soil surface covered with crop residue.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- intercropped treatmentse1
- Outcome
- percentage of soil surface covered with crop residuee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Above-ground crop residue was greater when corn was intercropped with Tanzania grass (10.7 Mg ha-1), Marandu (10.1 Mg ha-1), and Ruzi Grass (9.8 Mg ha-1) than when corn was not intercropped (4.0 Mg ha-1)”
e1“The intercropped treatments increased the percentage of soil surface covered with crop residue”
Claim · model-written summary
Soybean grain yield was higher after sole and intercropped ruzi grass than after other crops.
- Taxon
- Soybean
Glycine maxe0 - Treatment
- sole ruzi grass and intercropped ruzi grasse0
- Outcome
- grain yieldse0
- Direction
- highere0
- Comparator
- other cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean and corn grain yields were higher after sole ruzi grass and intercropped ruzi grass than after other crops”
Claim · model-written summary
Corn grain yield was higher after sole and intercropped ruzi grass than after other crops.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- sole ruzi grass and intercropped ruzi grasse0
- Outcome
- grain yieldse0
- Direction
- highere0
- Comparator
- other cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean and corn grain yields were higher after sole ruzi grass and intercropped ruzi grass than after other crops”
Claim · model-written summary
Intercropping corn with Brachiaria spp. maintains soil nutrients.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- The intercropping corn with Brachiaria spp.e0
- Outcome
- nutrients in the soile0
- Direction
- maintainse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropping corn with Brachiaria spp. and corn with Panicum spp. increases above-ground crop residue production and maintains nutrients in the soil without reducing late-season corn yield and the viability of no-till in the midwestern region of Brazil”
Claim · model-written summary
Intercropping corn with Brachiaria spp. does not reduce the viability of no-till.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- The intercropping corn with Brachiaria spp.e0
- Outcome
- viability of no-tille0
- Direction
- without reducinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropping corn with Brachiaria spp. and corn with Panicum spp. increases above-ground crop residue production and maintains nutrients in the soil without reducing late-season corn yield and the viability of no-till in the midwestern region of Brazil”
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See all 834 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.