Abstract
ABSTRACT The Brazilian Savannah region presents a great potential for the expansion of upland rice crops. However, studies are necessary to identify practices that can improve the crop performance, especially in no-tillage systems. This study aimed to assess the effect of cover crops in association with corn on the development and yield of rice cultivated in rotation and cover fertilized with nitrogen doses. The sprinkler irrigation system was used and the experiment was developed in the 2014/2015 and 2016/2017 harvest years, using a randomized block design, in a 5 × 4 factorial scheme. The treatments consisted of the crop remains combinations of single corn crop, corn + Crotalaria spectabilis, corn + pigeon pea, corn + jack bean and corn + Urochloa ruziziensis, as well as cover nitrogen doses (0 kg ha-1, 40 kg ha-1, 80 kg ha-1 and 120 kg ha-1) in the rice. The cultivation of upland rice in rotation with corn + pigeon pea was favored by the greater soil cover and nitrogen supply via cycling, if compared to the rotation with single corn crop. The intercropped corn + pigeon pea cultivation in the previous summer resulted in a 15 % increase in the yield of rice grains seeded in the rotation, when compared to the single corn crop. The cover nitrogen application positively influenced the grain yield with the maximum estimated doses of 46 kg ha-1 and 105 kg ha-1 of nitrogen, respectively in the 2014/2015 and 2016/2017 harvest years.
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Claims 4
Claim · model-written summary
Corn and pigeon pea rotation favored upland rice through soil cover and nitrogen cycling.
- Taxon
- upland rice
Oryza sativae0 - Treatment
- corn + pigeon peae0
- Outcome
- cultivation of upland ricee0
- Qualifier
- greater soil cover and nitrogen supply via cyclinge0
- Comparator
- single corn crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cultivation of upland rice in rotation with corn + pigeon pea was favored by the greater soil cover and nitrogen supply via cycling, if compared to the rotation with single corn crop”
Claim · model-written summary
Prior corn and pigeon pea intercropping increased rice grain yield by 15% versus corn alone.
- Taxon
- riceOryza sativae0
- Treatment
- intercropped corn + pigeon pea cultivatione0
- Outcome
- yield of rice grainse0
- Direction
- increasee0
- Value
- 15 %e0
- Comparator
- single corn crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The intercropped corn + pigeon pea cultivation in the previous summer resulted in a 15 % increase in the yield of rice grains seeded in the rotation, when compared to the single corn crop”
Claim · model-written summary
Cover nitrogen increased grain yield with a maximum estimated dose of 46 kg ha-1 in 2014/2015.
- Taxon
- riceOryza sativae1
- Treatment
- cover nitrogen applicatione0
- Outcome
- grain yielde0
- Direction
- positively influencede0
- Value
- 46 kg ha-1e0
- Qualifier
- 2014/2015e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cover nitrogen application positively influenced the grain yield with the maximum estimated doses of 46 kg ha-1 and 105 kg ha-1 of nitrogen, respectively in the 2014/2015 and 2016/2017 harvest years”
e1“upland rice crops”
Claim · model-written summary
Cover nitrogen increased grain yield with a maximum estimated dose of 105 kg ha-1 in 2016/2017.
- Taxon
- riceOryza sativae1
- Treatment
- cover nitrogen applicatione0
- Outcome
- grain yielde0
- Direction
- positively influencede0
- Value
- 105 kg ha-1e0
- Qualifier
- 2016/2017e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cover nitrogen application positively influenced the grain yield with the maximum estimated doses of 46 kg ha-1 and 105 kg ha-1 of nitrogen, respectively in the 2014/2015 and 2016/2017 harvest years”
e1“upland rice crops”
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