Abstract
A three-year experiment was conducted in order to examine the effects of potassium (K) application rates on plant K accumulation, K use efficiency and grain quality of japonica rice (Wuxiangjing14 and Wuyujing3) from 2000 to 2002 in Dongtai, Jiangsu, China. When K fertilizer was applied as basal dressing, K uptake of rice population amounted to maximum at the K2O application rate of 12.8 kg/667m2 and excessive-fertilization decreased population K uptake, grains K absorption always increased with the increase of K fertilizer application rate, only the increment extent decreased gradually. Potassium uptake by rice population peaked in the growth season from the elongation stage to the heading stage. Non-fertilization and excessive-fertilization enhanced the proportion of plant K uptake before the elongation stage, but reduced effective panicles. With one-time application of K fertilizer as basal dressing, the highest grain yield and quality occurred at the level of 1∶0.8 of N∶K2O ratio, which significantly increased the percentage of earbearing tiller and setting percentage and K physiological and agronomy efficiencies. Also, low chalkiness degree and amylose content were found at this level. Compared to one-time application of K fertilizer as basal dressing, fertilization as panicle fertilizer caused increases in plant K uptake and proportion from elongation stage to heading stage, the number of filled grain, the setting percentage and gel consistency. Moreover, K fertilization as panicle fertilizer significantly decreased chalkiness degree and amylose content, resulting in considerable high grain yield and quality.
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Claims 13
Claim · model-written summary
Rice population K uptake peaked at a basal K2O rate of 12.8 kg/667m2.
- Taxon
- rice
Oryza sativae0 - Treatment
- K2O application rate of 12.8 kg/667m2e0
- Outcome
- K uptake of rice populatione0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K uptake of rice population amounted to maximum at the K2O application rate of 12.8 kg/667m2”
Claim · model-written summary
Excess potassium fertilization reduced population K uptake.
- Taxon
- riceOryza sativat0
- Treatment
- excessive-fertilizatione0
- Outcome
- population K uptakee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive-fertilization decreased population K uptake”
t0“rice”
Claim · model-written summary
Grain K absorption increased with potassium rate, with a gradually smaller increment.
- Taxon
- riceOryza sativat0
- Treatment
- K fertilizer application ratee0
- Outcome
- grains K absorptione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grains K absorption always increased with the increase of K fertilizer application rate, only the increment extent decreased gradually”
t0“rice”
Claim · model-written summary
Rice population K uptake peaked between elongation and heading.
- Taxon
- riceOryza sativae0
- Organ / stage
- elongation stage to the heading stagee0
- Outcome
- Potassium uptakee0
- Direction
- peakede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium uptake by rice population peaked in the growth season from the elongation stage to the heading stage”
Claim · model-written summary
No fertilization and excessive fertilization raised the share of K uptake before elongation.
- Taxon
- riceOryza sativat0
- Treatment
- Non-fertilization and excessive-fertilizatione0
- Outcome
- proportion of plant K uptake before the elongation stagee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-fertilization and excessive-fertilization enhanced the proportion of plant K uptake before the elongation stage”
t0“rice”
Claim · model-written summary
No fertilization and excessive fertilization reduced effective panicles.
- Taxon
- riceOryza sativat0
- Treatment
- Non-fertilization and excessive-fertilizatione0
- Outcome
- effective paniclese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-fertilization and excessive-fertilization enhanced the proportion of plant K uptake before the elongation stage, but reduced effective panicles”
t0“rice”
Claim · model-written summary
A basal N:K2O ratio of 1∶0.8 gave the highest grain yield and quality.
- Taxon
- riceOryza sativat0
- Treatment
- 1∶0.8 of N∶K2O ratioe0
- Outcome
- grain yield and qualitye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest grain yield and quality occurred at the level of 1∶0.8 of N∶K2O ratio”
t0“rice”
Claim · model-written summary
The 1∶0.8 basal N:K2O ratio significantly raised earbearing tiller percentage, setting percentage, and K efficiencies.
- Taxon
- riceOryza sativat0
- Treatment
- 1∶0.8 of N∶K2O ratioe1
- Outcome
- percentage of earbearing tiller and setting percentage and K physiological and agronomy efficienciese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which significantly increased the percentage of earbearing tiller and setting percentage and K physiological and agronomy efficiencies”
e1“1∶0.8 of N∶K2O ratio”
t0“rice”
Claim · model-written summary
The 1∶0.8 basal N:K2O ratio had low chalkiness and amylose content.
- Taxon
- riceOryza sativat0
- Treatment
- 1∶0.8 of N∶K2O ratioe1
- Outcome
- chalkiness degree and amylose contente0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low chalkiness degree and amylose content were found at this level”
e1“1∶0.8 of N∶K2O ratio”
t0“rice”
Claim · model-written summary
Panicle fertilization increased K uptake and the share taken up from elongation to heading versus basal fertilization.
- Taxon
- riceOryza sativat0
- Treatment
- fertilization as panicle fertilizere0
- Outcome
- plant K uptake and proportion from elongation stage to heading stagee0
- Direction
- increasese0
- Comparator
- one-time application of K fertilizer as basal dressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to one-time application of K fertilizer as basal dressing, fertilization as panicle fertilizer caused increases in plant K uptake and proportion from elongation stage to heading stage”
t0“rice”
Claim · model-written summary
Panicle fertilization increased filled grain number, setting percentage, and gel consistency versus basal fertilization.
- Taxon
- riceOryza sativat0
- Treatment
- fertilization as panicle fertilizere0
- Outcome
- number of filled grain, the setting percentage and gel consistencye0
- Direction
- increasese0
- Comparator
- one-time application of K fertilizer as basal dressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to one-time application of K fertilizer as basal dressing, fertilization as panicle fertilizer caused increases in plant K uptake and proportion from elongation stage to heading stage, the number of filled grain, the setting percentage and gel consistency”
t0“rice”
Claim · model-written summary
Panicle K fertilization significantly reduced grain chalkiness and amylose content.
- Taxon
- riceOryza sativat0
- Treatment
- K fertilization as panicle fertilizere0
- Outcome
- chalkiness degree and amylose contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K fertilization as panicle fertilizer significantly decreased chalkiness degree and amylose content”
t0“rice”
Claim · model-written summary
Panicle K fertilization yielded high grain yield and quality.
- Taxon
- riceOryza sativat0
- Treatment
- K fertilization as panicle fertilizere1
- Outcome
- grain yield and qualitye0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting in considerable high grain yield and quality”
e1“K fertilization as panicle fertilizer”
t0“rice”
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