Abstract
Abstract Global rice ( Oryza sativa L.) cultivation is expected to increase, especially in upland no‐tillage systems (NTS). The difficulty in producing and maintaining straw in NTS in the Brazilian Cerrado and comparative regions worldwide can be overcome by using cover crops in irrigated areas. The potential of straw accumulation, soil cover maintenance, and nutrient cycling is considered while choosing cover crop species, because these characteristics may interfere with subsequent crop cultivation. This study was conducted to determine whether cover crops could benefit the development, productivity, and industrial quality of upland rice grains irrigated by sprinklers and cultivated in succession. The experiment was conducted in the Cerrado, with a summer rainy season and a dry winter. The treatments consisted of six cover crops (millet [ Pennisetum glaucum ], sunn hemp [ Crotalaria juncea ], pigeonpea [ Cajanus cajan ], millet + sunn hemp, millet + pigeonpea, and fallow) sowed in winter or spring. Compared to fallow, the cover crops cultivated in winter or spring led to increased straw production, accumulation of approximately 150% more nitrogen in straw, and possibly improved rice nutritional value because of the higher N content. Rice plants cultivated after sunn hemp developed a greater dry mass than rice cultivated after the fallow treatment. Grain yield was not influenced by the cover crops. However, sunn hemp cultivation increased the milling yield, head rice yield, and the milled rice productivity (MRP), compared to cultivation following the fallow treatment. Cultivation of sunn hemp before the upland rice crop improved MRP compared to that following the fallow treatment.
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Claims 8
Claim · model-written summary
Winter or spring cover crops increased straw production versus fallow.
Verbatim
e0“Compared to fallow, the cover crops cultivated in winter or spring led to increased straw production”
Claim · model-written summary
Winter or spring cover crops accumulated about 150% more nitrogen in straw than fallow.
Verbatim
e0“Compared to fallow, the cover crops cultivated in winter or spring led to increased straw production, accumulation of approximately 150% more nitrogen in straw”
Claim · model-written summary
Cover crops may improve rice nutritional value through greater nitrogen content.
- Taxon
- rice
Oryza sativae0 - Outcome
- rice nutritional valuee0
- Direction
- improvede0
- Qualifier
- possiblye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“possibly improved rice nutritional value because of the higher N content.”
Claim · model-written summary
Rice after sunn hemp developed more dry mass than rice after fallow.
- Taxon
- RiceOryza sativae0
- Treatment
- sunn hempe0
- Outcome
- dry masse0
- Direction
- greatere0
- Comparator
- fallow treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice plants cultivated after sunn hemp developed a greater dry mass than rice cultivated after the fallow treatment.”
Claim · model-written summary
Cover crops did not influence rice grain yield.
- Taxon
- riceOryza sativat0
- Treatment
- cover cropse0
- Outcome
- Grain yielde0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield was not influenced by the cover crops.”
t0“rice”
Claim · model-written summary
Sunn hemp increased rice milling yield relative to fallow.
- Taxon
- riceOryza sativat0
- Treatment
- sunn hemp cultivatione0
- Outcome
- milling yielde0
- Direction
- increasede0
- Comparator
- fallow treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunn hemp cultivation increased the milling yield, head rice yield, and the milled rice productivity (MRP), compared to cultivation following the fallow treatment.”
t0“rice”
Claim · model-written summary
Sunn hemp increased head rice yield relative to fallow.
- Taxon
- riceOryza sativat0
- Treatment
- sunn hemp cultivatione0
- Outcome
- head rice yielde0
- Direction
- increasede0
- Comparator
- fallow treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunn hemp cultivation increased the milling yield, head rice yield, and the milled rice productivity (MRP), compared to cultivation following the fallow treatment.”
t0“rice”
Claim · model-written summary
Sunn hemp increased milled rice productivity relative to fallow.
- Taxon
- riceOryza sativae0
- Treatment
- sunn hemp cultivatione0
- Outcome
- milled rice productivity (MRP)e0
- Direction
- increasede0
- Comparator
- fallow treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sunn hemp cultivation increased the milling yield, head rice yield, and the milled rice productivity (MRP), compared to cultivation following the fallow treatment.”
The same questions in other papers
Crotalaria juncea · yield · Oryza sativa (rice)Positive and negative results
15 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
13 papers more in this group
See all 17 papers →Crotalaria juncea · growth · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
cover crop · yield · Oryza sativa (rice)Results differ
7 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
21 papers more in this group
See all 25 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.