Abstract
Upland rice ( Oryza sativa L.) cultivation has been increasing in global importance due to the decreasing water availability for flood‐irrigated rice. The use of sprinkler irrigation to supplement rainfall and the identification of cultivars more adapted to lower water availability could be effective alternatives for producing upland rice without yield losses while using less water. The objective of this field study was to evaluate the root distribution, plant nutrition, and grain yield of two drought tolerant upland rice cultivars under two water regimes in the Cerrado Region of Brazil during two growing seasons. The main plots were two water regimes (rainfed and sprinkler‐irrigation plus rainfall). Subplots were two upland rice cultivars Carajás and IAC 201. Low water availability reduced root growth by 7% and grain yields were from 2644 to 4002 kg ha −1 on average for rainfed and sprinkler irrigation treatments, respectively. Carajás had a significantly better root distribution, nutrient uptake, and higher grain yield (3732 kg ha −1 ) compared with IAC 201 (2914 kg ha −1 ) averaged over two growing seasons and water regimes. There were no treatment interactions. Our results suggest that, even when cultivars with a higher tolerance to less water availability are used, using sprinkler irrigation to augment limited rainfall during dry periods may be a viable method to increase upland rice grain yields.
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Claims 6
Claim · model-written summary
Low water availability reduced upland rice root growth by 7%.
- Taxon
- Upland Rice
Oryza sativat0 - Treatment
- Low water availabilitye0
- Outcome
- root growthe0
- Direction
- reducede0
- Value
- 7%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low water availability reduced root growth by 7%”
t0“Upland Rice”
Claim · model-written summary
Average grain yield was 2644 kg per ha under rainfed and 4002 kg per ha under sprinkler irrigation.
- Taxon
- Upland RiceOryza sativat0
- Treatment
- sprinkler irrigatione0
- Outcome
- grain yieldse0
- Direction
- increaseinferrede0
- Value
- 2644 to 4002 kg hae0
- Comparator
- rainfede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yields were from 2644 to 4002 kg ha −1 on average for rainfed and sprinkler irrigation treatments”
t0“Upland Rice”
Claim · model-written summary
Carajás had significantly better root distribution and nutrient uptake than IAC 201.
- Taxon
- Upland RiceOryza sativat0
- Material
- Carajáse0
- Outcome
- root distribution, nutrient uptakee0
- Direction
- bettere0
- Comparator
- IAC 201e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carajás had a significantly better root distribution, nutrient uptake, and higher grain yield (3732 kg ha −1 ) compared with IAC 201”
t0“Upland Rice”
Claim · model-written summary
Carajás had higher grain yield (3732 kg per ha) than IAC 201 (2914 kg per ha), averaged over two growing seasons and water regimes.
- Taxon
- Upland RiceOryza sativat0
- Material
- Carajáse0
- Outcome
- grain yielde0
- Direction
- highere0
- Value
- 3732 kg hae0
- Qualifier
- 2914 kg hae0
- Comparator
- IAC 201e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carajás had a significantly better root distribution, nutrient uptake, and higher grain yield (3732 kg ha −1 ) compared with IAC 201 (2914 kg ha”
t0“Upland Rice”
Claim · model-written summary
There were no treatment interactions between water regime and cultivar.
- Taxon
- Upland RiceOryza sativat0
- Outcome
- treatment interactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no treatment interactions”
t0“Upland Rice”
Claim · model-written summary
The authors suggest that sprinkler irrigation to augment limited rainfall during dry periods may be a viable method to increase upland rice grain yields.
- Taxon
- upland riceOryza sativae0
- Outcome
- increase upland rice grain yieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“using sprinkler irrigation to augment limited rainfall during dry periods may be a viable method to increase upland rice grain yields”
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