Abstract
A delay in the mechanical transplantation (MT) of rice seedlings frequently occurs in Huanghuai wheat-rice rotation cropping districts of China, due to the late harvest of wheat, the poor weather conditions and the insufficiency of transplanters, missing the optimum transplanting time and causing seedlings to age. To identify how delaying transplanting rice affects the agronomic characteristics including the growth duration, photosynthetic productivity and dry matter remobilization efficiency and the grain yield under mechanical transplanting pattern, an experiment with a split-plot design was conducted over two consecutive years. The main plot includes two types of cultivation: mechanical transplanting and artificial transplanting (AT). The subplot comprises four japonica rice cultivars. The results indicate that the rice jointing, booting, heading and maturity stages were postponed under MT when using AT as a control. The tiller occurrence number, dry matter weight per tiller, accumulative dry matter for the population, leaf area index, crop growth rate, photosynthetic potential, and dry matter remobilization efficiency of the leaf under MT significantly decreased compared to those under AT. In contrast, the reduction rate of the leaf area during the heading-maturity stage was markedly enhanced under MT. The numbers of effective panicles and filled grains per panicle and the grain yield significantly decreased under MT. A significant correlation was observed between the dry matter production, remobilization and distribution characteristics and the grain yield. We infer that, as with rice from old seedlings, the decrease in the tiller occurrence, the photosynthetic productivity and the assimilate remobilization efficiency may be important agronomic traits that are responsible for the reduced grain yield under MT.
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Claims 9
Claim · model-written summary
Mechanical transplanting postponed rice jointing, booting and heading stages relative to artificial transplanting.
- Taxon
- rice
Oryza sativae0 - Treatment
- MTe0
- Outcome
- jointing, booting, heading and maturity stagese0
- Direction
- postponede0
- Comparator
- ATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rice jointing, booting, heading and maturity stages were postponed under MT when using AT as a control”
Claim · model-written summary
Mechanical transplanting significantly decreased tiller occurrence, dry matter per tiller and population dry matter.
- Taxon
- RiceOryza sativat0
- Treatment
- MTe0
- Outcome
- tiller occurrence number, dry matter weight per tiller, accumulative dry matter for the populatione0
- Direction
- decreasede0
- Comparator
- ATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tiller occurrence number, dry matter weight per tiller, accumulative dry matter for the population, leaf area index, crop growth rate, photosynthetic potential, and dry matter remobilization efficiency of the leaf under MT significantly decreased compared to those under AT”
t0“Rice”
Claim · model-written summary
Mechanical transplanting significantly decreased leaf area index, crop growth rate and photosynthetic potential.
- Taxon
- RiceOryza sativat0
- Treatment
- MTe0
- Outcome
- leaf area index, crop growth rate, photosynthetic potentiale0
- Direction
- decreasede0
- Comparator
- ATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tiller occurrence number, dry matter weight per tiller, accumulative dry matter for the population, leaf area index, crop growth rate, photosynthetic potential, and dry matter remobilization efficiency of the leaf under MT significantly decreased compared to those under AT”
t0“Rice”
Claim · model-written summary
Mechanical transplanting significantly decreased leaf dry matter remobilization efficiency.
- Taxon
- RiceOryza sativat0
- Treatment
- MTe0
- Outcome
- dry matter remobilization efficiency of the leafe0
- Direction
- decreasede0
- Comparator
- ATe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter remobilization efficiency of the leaf under MT significantly decreased compared to those under AT”
t0“Rice”
Claim · model-written summary
Mechanical transplanting markedly enhanced the leaf area reduction rate during heading to maturity.
- Taxon
- RiceOryza sativat0
- Organ / stage
- heading-maturity stagee0
- Treatment
- MTe0
- Outcome
- reduction rate of the leaf areae0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction rate of the leaf area during the heading-maturity stage was markedly enhanced under MT”
t0“Rice”
Claim · model-written summary
Mechanical transplanting significantly decreased effective panicle number and filled grains per panicle.
- Taxon
- RiceOryza sativat0
- Treatment
- MTe0
- Outcome
- numbers of effective panicles and filled grains per paniclee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The numbers of effective panicles and filled grains per panicle and the grain yield significantly decreased under MT”
t0“Rice”
Claim · model-written summary
Mechanical transplanting significantly decreased grain yield.
- Taxon
- RiceOryza sativat0
- Treatment
- MTe0
- Outcome
- grain yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the grain yield significantly decreased under MT”
t0“Rice”
Claim · model-written summary
Dry matter production, remobilization and distribution characteristics correlated significantly with grain yield.
- Taxon
- RiceOryza sativat0
- Outcome
- grain yielde0
- Qualifier
- dry matter production, remobilization and distribution characteristicse0
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant correlation was observed between the dry matter production, remobilization and distribution characteristics and the grain yield”
t0“Rice”
Claim · model-written summary
The authors infer reduced tillering, photosynthetic productivity and assimilate remobilization may explain reduced yield under mechanical transplanting.
- Taxon
- RiceOryza sativat0
- Treatment
- MTe0
- Outcome
- reduced grain yielde0
- Qualifier
- decrease in the tiller occurrence, the photosynthetic productivity and the assimilate remobilization efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease in the tiller occurrence, the photosynthetic productivity and the assimilate remobilization efficiency may be important agronomic traits that are responsible for the reduced grain yield under MT”
t0“Rice”
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