Abstract
ABSTRACT In order to reach an optimum and sustainable production, growers must know the fertilizing potassium (K) and phosphorous (P) application rates. The present study aimed to determine the rice development in response to combined rates of P and K, on Plinthaquults (380-400 g kg-1 of clay), under high and low fertility conditions, in the tropical lowland plain of the Araguaia river, Brazil. Three field experiments were performed, each one consisting of a completely randomized factorial block design, with three replications. Treatments included a combination of six K2O rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1) with six P2O5 rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1). No interaction effect between P and K rates was observed for the evaluated variables in any fertility level/year. Phosphorous application under low fertility conditions, as well as K under high fertility conditions, affect overall crop nutrition, tillering capacity, yield components and grain yield of lowland rice, though no effects were observed due to the P application in high fertility soils and K in low fertility soils. Under high fertility conditions, the grain yield increment rate due to the K application was 4.04 kg ha-1, whereas in the low fertility areas, such as recently cleared fields, a maximum yield of 7,161 kg ha-1 was achieved by applying 140 kg ha-1 of P.
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Claims 7
Claim · model-written summary
P and K rates showed no interaction for evaluated variables.
- Taxon
- rice
Oryza sativat0 - Treatment
- P and K ratese0
- Outcome
- interaction effect between P and K ratese0
- Direction
- No interaction effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No interaction effect between P and K rates was observed for the evaluated variables in any fertility level/year”
t0“rice”
Claim · model-written summary
P application under low fertility affected rice nutrition, tillering, yield components and grain yield.
- Taxon
- lowland ricee0
- Treatment
- Phosphorous application under low fertility conditionse0
- Outcome
- overall crop nutrition, tillering capacity, yield components and grain yielde0
Not reportedComparatorDirection
Verbatim
e0“Phosphorous application under low fertility conditions, as well as K under high fertility conditions, affect overall crop nutrition, tillering capacity, yield components and grain yield of lowland rice”
Claim · model-written summary
K application under high fertility affected rice nutrition, tillering, yield components and grain yield.
- Taxon
- lowland ricee0
- Treatment
- K under high fertility conditionse0
- Outcome
- overall crop nutrition, tillering capacity, yield components and grain yielde0
Not reportedComparatorDirection
Verbatim
e0“Phosphorous application under low fertility conditions, as well as K under high fertility conditions, affect overall crop nutrition, tillering capacity, yield components and grain yield of lowland rice”
Claim · model-written summary
P application in high fertility soil had no observed effect.
- Taxon
- riceOryza sativat0
- Treatment
- P applicatione0
- Outcome
- no effectse0
- Direction
- no effectse0
- Setting
- high fertility soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effects were observed due to the P application in high fertility soils”
t0“rice”
Claim · model-written summary
K application in low fertility soil had no observed effect.
- Taxon
- riceOryza sativat0
- Treatment
- Ke0
- Outcome
- no effectse0
- Direction
- no effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no effects were observed due to the P application in high fertility soils and K in low fertility soils”
t0“rice”
Claim · model-written summary
Under high fertility, K application increased rice grain yield at 4.04 kg ha-1.
- Taxon
- riceOryza sativat0
- Treatment
- K applicatione0
- Outcome
- grain yield increment ratee0
- Direction
- incremente0
- Value
- 4.04 kg ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under high fertility conditions, the grain yield increment rate due to the K application was 4.04 kg ha-1”
t0“rice”
Claim · model-written summary
In low fertility fields, 140 kg ha-1 P gave a maximum rice yield of 7,161 kg ha-1.
- Taxon
- riceOryza sativat0
- Treatment
- 140 kg ha-1 of Pe0
- Outcome
- maximum yielde0
- Direction
- maximume0
- Value
- 7,161 kg ha-1e0
- Setting
- low fertility arease0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the low fertility areas, such as recently cleared fields, a maximum yield of 7,161 kg ha-1 was achieved by applying 140 kg ha-1 of P”
t0“rice”
The same questions in other papers
potassium · yield · Oryza sativa (rice)Positive and negative results
343 papers in the same direction as this paper · 34 in the opposite direction · 5 reporting no difference from an alternative
- positive
- no effect
- negative
379 papers more in this group
See all 383 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.