Abstract
Potassium is one of the most important nutrients for rice production in many areas of Asia, especially in southeast China where potassium deficiency in soil is a widespread problem. Field experiments were conducted for four consecutive years in Jinhua City, Zhejiang Province, to determine utilization of nutrients (N, P and K) by inbred and hybrid rice and rice grain yields as affected by application of potassium fertilizer under irrigated conditions. Grain yield and nutrient harvest index showed a significant response to the NPK treatment as compared to the NP treatment. This suggested that potassium improved transfer of nitrogen and phosphorus from stems and leaves to panicles in rice plants. N and P use efficiencies of rice were not strongly responsive to potassium, but K use efficiency decreased significantly despite the fact that the amount of total K uptake increased. A significant difference between varieties was also observed with respect to nutrient uptake and use efficiency. Hybrid rice exhibited physiological advantage in N and P uptake and use efficiency over inbred rice. Analysis of annual dynamic change of exchangeable K and non-exchangeable K in the test soil indicated that non-exchangeable K was an important K source for rice. Potassium application caused an annual decrease in the concentration of available K in the soil tested, whereas an increase was observed in non-exchangeable K. It could be concluded that K fertilizer application at the rate of 100 kg ha-1 per season was not high enough to match K output, and efficient K management for rice must be based on the K input/output balance.
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Claims 13
Claim · model-written summary
NPK significantly affected rice grain yield relative to NP.
- Taxon
- rice
Oryza sativat0 - Treatment
- NPK treatmente0
- Outcome
- Grain yielde0
- Comparator
- NP treatmente0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield and nutrient harvest index showed a significant response to the NPK treatment as compared to the NP treatment.”
t0“Rice”
Claim · model-written summary
NPK significantly affected nutrient harvest index relative to NP.
- Taxon
- riceOryza sativat0
- Treatment
- NPK treatmente0
- Outcome
- nutrient harvest indexe0
- Comparator
- NP treatmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield and nutrient harvest index showed a significant response to the NPK treatment as compared to the NP treatment.”
t0“Rice”
Claim · model-written summary
Potassium was inferred to improve transfer of N and P from vegetative tissue to panicles.
- Taxon
- riceOryza sativae0
- Treatment
- potassiume0
- Outcome
- transfer of nitrogen and phosphorus from stems and leaves to paniclese0
- Direction
- improvede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This suggested that potassium improved transfer of nitrogen and phosphorus from stems and leaves to panicles in rice plants.”
Claim · model-written summary
Rice N and P use efficiencies did not respond strongly to potassium.
- Taxon
- riceOryza sativae0
- Treatment
- potassiume0
- Outcome
- N and P use efficienciese0
- Direction
- not strongly responsivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N and P use efficiencies of rice were not strongly responsive to potassium”
Claim · model-written summary
Rice K use efficiency decreased significantly with potassium application.
- Taxon
- riceOryza sativat0
- Treatment
- Potassium Applicationt0
- Outcome
- K use efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K use efficiency decreased significantly despite the fact that the amount of total K uptake increased.”
t0“Rice in Response to Potassium Application”
Claim · model-written summary
Total K uptake increased.
- Taxon
- riceOryza sativat0
- Outcome
- total K uptakee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of total K uptake increased.”
t0“Rice”
Claim · model-written summary
Varieties differed significantly in nutrient uptake and use efficiency.
- Taxon
- riceOryza sativat0
- Material
- varietiese0
- Outcome
- nutrient uptake and use efficiencye0
- Direction
- differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant difference between varieties was also observed with respect to nutrient uptake and use efficiency.”
t0“Rice”
Claim · model-written summary
Hybrid rice had superior N and P uptake and use efficiency to inbred rice.
- Taxon
- riceOryza sativae0
- Material
- Hybrid ricee0
- Outcome
- N and P uptake and use efficiencye0
- Direction
- advantagee0
- Comparator
- inbred ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid rice exhibited physiological advantage in N and P uptake and use efficiency over inbred rice.”
Claim · model-written summary
Non-exchangeable soil K was identified as an important source for rice.
- Taxon
- riceOryza sativae0
- Outcome
- important K source for ricee0
- Qualifier
- non-exchangeable Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-exchangeable K was an important K source for rice.”
Claim · model-written summary
Potassium application caused annual decline in available soil K.
- Taxon
- riceOryza sativat0
- Treatment
- Potassium applicatione0
- Outcome
- concentration of available K in the soil testede0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium application caused an annual decrease in the concentration of available K in the soil tested”
t0“Rice”
Claim · model-written summary
Potassium application increased non-exchangeable soil K.
- Taxon
- riceOryza sativat0
- Treatment
- Potassium Applicationt0
- Outcome
- non-exchangeable Ke0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas an increase was observed in non-exchangeable K.”
t0“Rice in Response to Potassium Application”
Claim · model-written summary
The authors concluded that 100 kg ha-1 K per season was insufficient to match K output.
- Taxon
- riceOryza sativat0
- Treatment
- K fertilizer application at the rate of 100 kg ha-1 per seasone0
- Outcome
- not high enough to match K outpute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K fertilizer application at the rate of 100 kg ha-1 per season was not high enough to match K output”
t0“Rice”
Claim · model-written summary
Efficient rice K management should use a K input/output balance.
- Taxon
- riceOryza sativae0
- Outcome
- K management for rice must be based on the K input/output balancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“efficient K management for rice must be based on the K input/output balance.”
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See all 17 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.