Abstract
Sweet potato (Ipomoea batatas L) is an important dicotyledonous tuberous staple crop of the Convolvulaceae family. It is valued for its tubers which are either boiled, fried, baked or roasted for human consumption or boiled and fed to livestock as a source of energy. However, the cultivation of sweet potato is constrained by low soil fertility, particularly inadequate potassium, which plays a pivotal role in the growth and tuber development of sweet potato. Therefore, the effects of potassium fertilizer rates on the growth, tuber yield and quality of sweet potato were determined at the Teaching and Research Farm, Ladoke Akintola University of Technology, Ogbomoso during 2022 major cropping season. The treatments were; 0 (control), 60, 90, 120, 150 and 180 kg K2O/ha laid out in randomized complete block design replicated three times. Data collected on length of primary vines, number of leaves, fresh shoot biomass, number of tubers, fresh tuber yield and nutritional contents of the tubers were subjected to analysis of variance and treatment means separated with least significance difference (LSD) at 5% probability level. The application of K fertilizer had significant influence on the performance of sweet potato. At 14 weeks after planting (WAP), plants treated with 180 kg K2O/ha produced the longest mean vine length (p = 0.043, 184.93 cm), highest number of leaves (p = 0.003, 217), highest fresh shoot biomass (p = 0.015, 11.83 t/ha), number of tubers (p = 0.037, 68) and fresh tuber yield (p = 0.0004, 22 t/ha). In contrast, plants that received no fertilizer, had the shortest vine length (133.67 cm), the least fresh shoot biomass (7.1 t/ha) and tuber yield (12.7 t/ha). The least number of leaves (136) was observed with the application of 60 kg K2O/ha while 90 kg K2O/ha produced the least number of tubers (46). The potassium content of sweet potato tuber was significantly influenced by K fertilizer rates, whereas the phosphorus content was unaffected. The highest contents of phosphorus (p = 0.967, 0.10%) and potassium (p = 0.038, 1.26%) were recorded in tubers that received 150 kg K2O/ha and 180 kg K2O/ha, respectively. The carotenoid, carbohydrate, and protein contents of sweet potato tuber decreased as the potassium rates increased. Conversely, the crude fiber content increased (p = 0.044) as the potassium rate increased. In conclusion, application of 180 kg K2O/ha improved the performance of sweet potato better than the other rates in the study area. However, it seems that the maximum yield potential of sweet potato in the study area had not been attained. Therefore, further research with higher than 180 kg K2O/ha may be required to identify the optimal level for cultivating sweet potatoes.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-sa. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 20
Claim · model-written summary
At 14 weeks, 180 kg K2O/ha produced the longest vines, 184.93 cm.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- 180 kg K2O/hae0
- Outcome
- mean vine lengthe0
- Direction
- longeste0
- Value
- 184.93 cme0
- Qualifier
- 14 weeks after planting (WAP)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“At 14 weeks after planting (WAP), plants treated with 180 kg K2O/ha produced the longest mean vine length (p = 0.043, 184.93 cm), highest number of leaves (p = 0.003, 217), highest fresh shoot biomass (p = 0.015, 11.83 t/ha), number of tubers (p = 0.037, 68) and fresh tuber yield (p = 0.0004, 22 t/ha).”
t0“sweet potato”
Claim · model-written summary
At 14 weeks, 180 kg K2O/ha produced the most leaves, 217.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 180 kg K2O/hae0
- Outcome
- number of leavese0
- Direction
- higheste0
- Value
- 217e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 weeks after planting (WAP), plants treated with 180 kg K2O/ha produced the longest mean vine length (p = 0.043, 184.93 cm), highest number of leaves (p = 0.003, 217), highest fresh shoot biomass (p = 0.015, 11.83 t/ha), number of tubers (p = 0.037, 68) and fresh tuber yield (p = 0.0004, 22 t/ha).”
t0“sweet potato”
Claim · model-written summary
At 14 weeks, 180 kg K2O/ha produced the highest fresh shoot biomass, 11.83 t/ha.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 180 kg K2O/hae0
- Outcome
- fresh shoot biomasse0
- Direction
- higheste0
- Value
- 11.83 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 weeks after planting (WAP), plants treated with 180 kg K2O/ha produced the longest mean vine length (p = 0.043, 184.93 cm), highest number of leaves (p = 0.003, 217), highest fresh shoot biomass (p = 0.015, 11.83 t/ha), number of tubers (p = 0.037, 68) and fresh tuber yield (p = 0.0004, 22 t/ha).”
t0“sweet potato”
Claim · model-written summary
At 14 weeks, 180 kg K2O/ha produced the most tubers, 68.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 180 kg K2O/hae0
- Outcome
- number of tuberse0
- Direction
- higheste0
- Value
- 68e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 weeks after planting (WAP), plants treated with 180 kg K2O/ha produced the longest mean vine length (p = 0.043, 184.93 cm), highest number of leaves (p = 0.003, 217), highest fresh shoot biomass (p = 0.015, 11.83 t/ha), number of tubers (p = 0.037, 68) and fresh tuber yield (p = 0.0004, 22 t/ha).”
t0“sweet potato”
Claim · model-written summary
At 14 weeks, 180 kg K2O/ha produced the highest fresh tuber yield, 22 t/ha.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 180 kg K2O/hae0
- Outcome
- fresh tuber yielde0
- Direction
- higheste0
- Value
- 22 t/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 weeks after planting (WAP), plants treated with 180 kg K2O/ha produced the longest mean vine length (p = 0.043, 184.93 cm), highest number of leaves (p = 0.003, 217), highest fresh shoot biomass (p = 0.015, 11.83 t/ha), number of tubers (p = 0.037, 68) and fresh tuber yield (p = 0.0004, 22 t/ha).”
t0“sweet potato”
Claim · model-written summary
Unfertilized plants had the shortest vines, 133.67 cm.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- no fertilizere0
- Outcome
- vine lengthe0
- Direction
- shorteste0
- Value
- 133.67 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants that received no fertilizer, had the shortest vine length (133.67 cm), the least fresh shoot biomass (7.1 t/ha) and tuber yield (12.7 t/ha).”
t0“sweet potato”
Claim · model-written summary
Unfertilized plants had the least shoot biomass, 7.1 t/ha.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- no fertilizere0
- Outcome
- fresh shoot biomasse0
- Direction
- leaste0
- Value
- 7.1 t/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants that received no fertilizer, had the shortest vine length (133.67 cm), the least fresh shoot biomass (7.1 t/ha) and tuber yield (12.7 t/ha).”
t0“sweet potato”
Claim · model-written summary
Unfertilized plants yielded 12.7 t/ha tubers, the least.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- no fertilizere0
- Outcome
- tuber yielde0
- Direction
- leaste0
- Value
- 12.7 t/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants that received no fertilizer, had the shortest vine length (133.67 cm), the least fresh shoot biomass (7.1 t/ha) and tuber yield (12.7 t/ha).”
t0“sweet potato”
Claim · model-written summary
The fewest leaves, 136, occurred at 60 kg K2O/ha.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 60 kg K2O/hae0
- Outcome
- number of leavese0
- Direction
- leaste0
- Value
- 136e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The least number of leaves (136) was observed with the application of 60 kg K2O/ha while 90 kg K2O/ha produced the least number of tubers (46).”
t0“sweet potato”
Claim · model-written summary
The fewest tubers, 46, occurred at 90 kg K2O/ha.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 90 kg K2O/hae0
- Outcome
- number of tuberse0
- Direction
- leaste0
- Value
- 46e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The least number of leaves (136) was observed with the application of 60 kg K2O/ha while 90 kg K2O/ha produced the least number of tubers (46).”
t0“sweet potato”
Claim · model-written summary
Tuber potassium content varied significantly with potassium fertilizer rate.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K fertilizer ratese0
- Outcome
- potassium content of sweet potato tubere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The potassium content of sweet potato tuber was significantly influenced by K fertilizer rates, whereas the phosphorus content was unaffected.”
Claim · model-written summary
Tuber phosphorus content was unaffected by potassium fertilizer rate.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- K fertilizer ratese0
- Outcome
- phosphorus contente0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The potassium content of sweet potato tuber was significantly influenced by K fertilizer rates, whereas the phosphorus content was unaffected.”
Claim · model-written summary
The highest phosphorus content, 0.10%, occurred at 150 kg K2O/ha, though the rate effect was nonsignificant.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 150 kg K2O/hae0
- Outcome
- contents of phosphoruse0
- Direction
- higheste0
- Value
- 0.10%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest contents of phosphorus (p = 0.967, 0.10%) and potassium (p = 0.038, 1.26%) were recorded in tubers that received 150 kg K2O/ha and 180 kg K2O/ha, respectively.”
t0“sweet potato”
Claim · model-written summary
The highest potassium content, 1.26%, occurred at 180 kg K2O/ha.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- 180 kg K2O/hae0
- Outcome
- potassiume0
- Direction
- higheste0
- Value
- 1.26%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest contents of phosphorus (p = 0.967, 0.10%) and potassium (p = 0.038, 1.26%) were recorded in tubers that received 150 kg K2O/ha and 180 kg K2O/ha, respectively.”
t0“sweet potato”
Claim · model-written summary
Tuber carotenoid content declined as potassium rates increased.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- potassium ratese0
- Outcome
- carotenoide0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carotenoid, carbohydrate, and protein contents of sweet potato tuber decreased as the potassium rates increased.”
Claim · model-written summary
Tuber carbohydrate content declined as potassium rates increased.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- potassium ratese0
- Outcome
- carbohydratee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carotenoid, carbohydrate, and protein contents of sweet potato tuber decreased as the potassium rates increased.”
Claim · model-written summary
Tuber protein content declined as potassium rates increased.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- potassium ratese0
- Outcome
- protein contentse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carotenoid, carbohydrate, and protein contents of sweet potato tuber decreased as the potassium rates increased.”
Claim · model-written summary
Tuber crude fiber content increased as potassium rate increased.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- potassium ratee0
- Outcome
- crude fiber contente0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conversely, the crude fiber content increased (p = 0.044) as the potassium rate increased.”
t0“sweet potato”
Claim · model-written summary
The authors concluded that 180 kg K2O/ha performed best in the study area.
- Taxon
- sweet potatoIpomoea batatase0
- Treatment
- 180 kg K2O/hae0
- Outcome
- improved the performancee0
- Comparator
- other ratese0
- Setting
- study areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of 180 kg K2O/ha improved the performance of sweet potato better than the other rates in the study area.”
Claim · model-written summary
The authors recommend testing rates above 180 kg K2O/ha to find the optimum.
- Taxon
- sweet potatoesIpomoea batatase0
- Outcome
- further research with higher than 180 kg K2O/hae0
- Qualifier
- may be requirede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“further research with higher than 180 kg K2O/ha may be required to identify the optimal level for cultivating sweet potatoes.”
The same questions in other papers
potassium · yield · Ipomoea batatas (sweet potato)Results differ
31 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- no effect
31 papers more in this group
See all 35 papers →potassium · growth · Ipomoea batatas (sweet potato)Positive and negative results
21 papers in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- no effect
23 papers more in this group
See all 27 papers →fertilization · nutrient: content · Ipomoea batatas (sweet potato)Positive and negative results
4 papers in the same direction as this paper · 28 in the opposite direction
- positive
- positive
- positive
29 papers more in this group
See all 33 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.