Abstract
Abstract A major limitation to improved crop growth on many acid Oxisols is low K availability. A field experiment was conducted in West Sumatra to study the effects of K fertilization of an oxisol under three levels of lime (0.375, 2.25 an 5 t ha −1 ) on K accumulation of a yearly upland rice ( Oryza sativa L.)‐soybean ( Glycine max L. Merr.) rotation where all above‐ground residue was removed. Six K treatments supplied 0 to 240 kg K ha −1 to each crop and lime treatment. Potassium fertilization increased grain yields of rice and soybean and K content of grain and stover of both crops. With both crops a large proportion of the K was present in the stover. Liming had no effect on K accumulation Of rice grain; an inconsistent effect on K accumulation in rice straw; and significantly increased the K content of soybean grain and stover. Upland rice was very efficient in utilizing K applied to that crop as well as residual soil K from previous fertilization. When K rate was greater than 100 kg ha −1 per crop appreciable amounts of K could not be accounted for indicating that the K was lost by leaching. Increases in exchangeable K with K fertilization only occurred in the 0‐ to 30‐cm depth.
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Claims 12
Claim · model-written summary
K fertilization increased rice grain yield.
- Taxon
- rice
Oryza sativae0 - Treatment
- Potassium fertilizatione0
- Outcome
- grain yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium fertilization increased grain yields of rice and soybean and K content of grain and stover of both crops”
Claim · model-written summary
K fertilization increased soybean grain yield.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Potassium fertilizatione0
- Outcome
- grain yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium fertilization increased grain yields of rice and soybean and K content of grain and stover of both crops”
Claim · model-written summary
K fertilization increased rice grain and stover K content.
- Taxon
- riceOryza sativae0
- Treatment
- Potassium fertilizatione0
- Outcome
- K content of grain and stovere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium fertilization increased grain yields of rice and soybean and K content of grain and stover of both crops”
Claim · model-written summary
K fertilization increased soybean grain and stover K content.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Potassium fertilizatione0
- Outcome
- K content of grain and stovere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium fertilization increased grain yields of rice and soybean and K content of grain and stover of both crops”
Claim · model-written summary
A large share of K in rice was in stover.
- Taxon
- RiceOryza sativat0
- Outcome
- a large proportion of the K was present in the stovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With both crops a large proportion of the K was present in the stover”
t0“Upland Rice‐Soybean”
Claim · model-written summary
A large share of K in soybean was in stover.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- a large proportion of the K was present in the stovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With both crops a large proportion of the K was present in the stover”
t0“Rice‐Soybean”
Claim · model-written summary
Liming had no effect on rice grain K accumulation.
- Taxon
- riceOryza sativae0
- Treatment
- Liminge0
- Outcome
- K accumulation Of rice graine0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Liming had no effect on K accumulation Of rice grain”
Claim · model-written summary
Liming had an inconsistent effect on rice straw K accumulation.
- Taxon
- riceOryza sativae0
- Treatment
- Liminge1
- Outcome
- K accumulation in rice strawe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an inconsistent effect on K accumulation in rice straw”
e1“Liming had no effect on K accumulation Of rice grain; an inconsistent effect on K accumulation in rice straw”
Claim · model-written summary
Liming significantly increased soybean grain and stover K content.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Liminge1
- Outcome
- K content of soybean grain and stovere0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly increased the K content of soybean grain and stover”
e1“Liming had no effect on K accumulation Of rice grain; an inconsistent effect on K accumulation in rice straw; and significantly increased the K content of soybean grain and stover”
Claim · model-written summary
Upland rice efficiently used applied and residual K.
- Taxon
- Upland riceOryza sativae0
- Outcome
- very efficient in utilizing K applied to that crop as well as residual soil Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Upland rice was very efficient in utilizing K applied to that crop as well as residual soil K from previous fertilization”
Claim · model-written summary
K above 100 kg ha−1 per crop left appreciable K unaccounted for, indicating leaching.
- Taxon
- RiceOryza sativat0
- Treatment
- K rate was greater than 100 kg ha −1 per crope0
- Outcome
- K was lost by leachinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When K rate was greater than 100 kg ha −1 per crop appreciable amounts of K could not be accounted for indicating that the K was lost by leaching”
t0“Upland Rice‐Soybean”
Claim · model-written summary
Exchangeable K increases with fertilization occurred only in the upper 30 cm.
- Taxon
- RiceOryza sativat0
- Treatment
- K fertilizatione0
- Outcome
- exchangeable Ke0
- Direction
- Increasese0
- Qualifier
- 0‐ to 30‐cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in exchangeable K with K fertilization only occurred in the 0‐ to 30‐cm depth”
t0“Upland Rice‐Soybean”
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See all 3,455 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.