Abstract
The cultivation of hybrid rice is a technology that allows for an increase in grain yield of 30% relative to the grain yield of conventional cultivars. However, the main challenge for this technology is related to seed production, which has high production costs and low seed yields. Therefore, agronomic techniques that could enhance flowering synchrony of parental lines in the field are essential for an efficient production system of hybrid rice seeds. The objective of this work was to study the effects of sowing depth, plant density and fertilization with nitrogen or phosphorus as potential techniques to increase the pollen availability in the field and, consequently, the flowering synchrony between parental lines in the production of hybrid rice seeds. The experiments were conducted during two growing seasons in the Central Region of Brazil. All of the experiments were conducted as a randomized complete block in a split plot scheme; however, the experiment with P fertilization had a factorial design. Our research allow inferring that nitrogen fertilization technique applied to the soil or foliar at the time of panicle differentiation does not affect the time of onset of flowering of rice varieties INTA Puitá CL and L106R, which are potential R lines for the production of hybrid rice. Agronomic techniques of variation in sowing depth, seeding rate and the phosphate fertilization affect the time of onset of flowering from 10 to 19 degree-days, which could represent two days in the crop cycle, for the line L106R. Such techniques constitute potential alternatives for use in hybrid rice seed production systems and could be applied in alternated blocks of R lines in the field to obtain longer periods of pollen availability in the field.
Abstract from the paper’s OpenAlex record; open copy licensed other-oa. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Soil or foliar nitrogen at panicle differentiation did not change flowering onset of INTA Puitá CL.
- Taxon
- rice
Oryza sativae0 - Material
- INTA Puitá CLe0
- Treatment
- nitrogen fertilizatione0
- Outcome
- time of onset of floweringe0
- Direction
- does not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen fertilization technique applied to the soil or foliar at the time of panicle differentiation does not affect the time of onset of flowering of rice varieties INTA Puitá CL and L106R”
Claim · model-written summary
Soil or foliar nitrogen at panicle differentiation did not change flowering onset of L106R.
- Taxon
- riceOryza sativae0
- Material
- L106Re0
- Treatment
- nitrogen fertilizatione0
- Outcome
- time of onset of floweringe0
- Direction
- does not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen fertilization technique applied to the soil or foliar at the time of panicle differentiation does not affect the time of onset of flowering of rice varieties INTA Puitá CL and L106R”
Claim · model-written summary
Sowing depth variation changed L106R flowering onset by 10 to 19 degree-days.
- Taxon
- riceOryza sativat0
- Material
- L106Re0
- Treatment
- variation in sowing depthe0
- Outcome
- time of onset of floweringe0
- Direction
- affecte0
- Value
- 10 to 19 degree-dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variation in sowing depth, seeding rate and the phosphate fertilization affect the time of onset of flowering from 10 to 19 degree-days, which could represent two days in the crop cycle, for the line L106R.”
t0“rice”
Claim · model-written summary
Seeding rate variation changed L106R flowering onset by 10 to 19 degree-days.
- Taxon
- riceOryza sativat0
- Material
- L106Re0
- Treatment
- seeding ratee0
- Outcome
- time of onset of floweringe0
- Direction
- affecte0
- Value
- 10 to 19 degree-dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variation in sowing depth, seeding rate and the phosphate fertilization affect the time of onset of flowering from 10 to 19 degree-days, which could represent two days in the crop cycle, for the line L106R.”
t0“rice”
Claim · model-written summary
Phosphate fertilization changed L106R flowering onset by 10 to 19 degree-days.
- Taxon
- riceOryza sativat0
- Material
- L106Re0
- Treatment
- phosphate fertilizatione0
- Outcome
- time of onset of floweringe0
- Direction
- affecte0
- Value
- 10 to 19 degree-dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variation in sowing depth, seeding rate and the phosphate fertilization affect the time of onset of flowering from 10 to 19 degree-days, which could represent two days in the crop cycle, for the line L106R.”
t0“rice”
Claim · model-written summary
The authors propose alternating R-line blocks with these techniques to extend field pollen availability.
- Taxon
- riceOryza sativat0
- Material
- R linese0
- Treatment
- alternated blocks of R linese0
- Outcome
- longer periods of pollen availability in the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such techniques constitute potential alternatives for use in hybrid rice seed production systems and could be applied in alternated blocks of R lines in the field to obtain longer periods of pollen availability in the field.”
t0“rice”
The same questions in other papers
fertilization · phenology · Oryza sativa (rice)Positive and negative results
4 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
18 papers more in this group
See all 22 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.