Abstract
The grain yield formation and some physiological characteristics were investigated during filling stage under triangle-planted system of rice intensification(TSRI) at different transplanting seedling-ages and planting densities with Ⅱyou 498 as material.The results showed that obvious compensation effect of planting density to transplanting seedling-age of rice under TSRI improved some morphological and physiological characteristics during grain filling stage and promoted yield.Transplanting 2-leaf-age seedlings at a suitable planting density(40 cm × 40 cm) was the best,which increased effective tiller number of plant population,gained reasonable structure of populations,had high leaf area index(LAI) and much higher percentage of efficient LAI,delayed the descending rate of LAI,and enhanced root activity,consequently,promoted dry matter accumulation and transportation during grain filling,and was helpful to coordinate the conflict among filled grain number per panicle,seed setting rate and 1000-grain weight.Effective panicle number and grain yield significantly decreased as seedlings were transplanted at 8-leaf age stage and lower planting density(50 cm×50 cm).For 5-leaf-age seedlings,the suitable planting density ranged from 30 cm × 30 cm to 40 cm × 40 cm,alleviating the contradiction of crop rotation.In addition,transplanting high leaf age seedlings was easy to accelerate the senescence process of rice during grain filling stage and decreased yield.It was noteworthy that high leaf age seedlings should be transplanted at relatively high planting densities,and the optimum planting density was 30 cm × 30 cm for the 8-leaf-age seedlings.
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Claims 9
Claim · model-written summary
Planting density compensated for seedling age and improved morphology, physiology and yield under TSRI.
- Taxon
- rice
Oryza sativae0 - Treatment
- planting densitye0
- Outcome
- morphological and physiological characteristicse0
- Direction
- improvede0
- Comparator
- transplanting seedling-agee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“obvious compensation effect of planting density to transplanting seedling-age of rice under TSRI improved some morphological and physiological characteristics during grain filling stage and promoted yield”
Claim · model-written summary
Two-leaf seedlings at 40 cm × 40 cm increased effective tiller number and produced a reasonable population structure.
- Treatment
- Transplanting 2-leaf-age seedlings at a suitable planting density(40 cm × 40 cm)e0
- Outcome
- effective tiller number of plant populatione0
- Direction
- increasede0
Not reportedTaxonMaterialComparator
Verbatim
e0“Transplanting 2-leaf-age seedlings at a suitable planting density(40 cm × 40 cm) was the best,which increased effective tiller number of plant population,gained reasonable structure of populations”
Claim · model-written summary
This treatment gave high LAI and a higher efficient LAI percentage.
Not reportedTaxon
Verbatim
e0“had high leaf area index(LAI) and much higher percentage of efficient LAI”
Claim · model-written summary
This treatment delayed LAI decline and enhanced root activity.
Not reportedTaxon
Verbatim
e0“delayed the descending rate of LAI,and enhanced root activity”
Claim · model-written summary
This treatment promoted dry matter accumulation and transportation during grain filling.
Not reportedTaxon
Verbatim
e0“promoted dry matter accumulation and transportation during grain filling”
Claim · model-written summary
At eight-leaf transplanting and 50 cm×50 cm spacing, effective panicle number and grain yield fell significantly.
- Treatment
- seedlings were transplanted at 8-leaf age stage and lower planting density(50 cm×50 cm)e0
- Outcome
- Effective panicle number and grain yielde0
- Direction
- decreasede0
Not reportedTaxonComparator
Verbatim
e0“Effective panicle number and grain yield significantly decreased as seedlings were transplanted at 8-leaf age stage and lower planting density(50 cm×50 cm)”
Claim · model-written summary
Five-leaf seedlings had a suitable density range of 30 cm × 30 cm to 40 cm × 40 cm.
Not reportedTaxon
Verbatim
e0“For 5-leaf-age seedlings,the suitable planting density ranged from 30 cm × 30 cm to 40 cm × 40 cm”
Claim · model-written summary
High leaf age seedlings accelerated senescence and reduced yield.
- Taxon
- riceOryza sativae0
- Treatment
- high leaf age seedlingse0
- Outcome
- senescence process of ricee0
- Direction
- acceleratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high leaf age seedlings was easy to accelerate the senescence process of rice during grain filling stage and decreased yield”
Claim · model-written summary
The authors recommend relatively high density for high leaf age seedlings, with 30 cm × 30 cm optimal for eight-leaf seedlings.
Not reportedTaxon
Verbatim
e0“high leaf age seedlings should be transplanted at relatively high planting densities,and the optimum planting density was 30 cm × 30 cm for the 8-leaf-age seedlings”
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