Abstract
A study was conducted in 20007/08 at Chitedze, Makoka and Chitala Research Stations to evaluate the effect of fertilizer application to sweetpotato (cv. Mugamba). Treatments comprised N (0, 30 and 60 kg /ha), P (0, 30, 60 kg /ha) and K (0, 50 and 100 kg / ha) in a 3x3x3 factorial arrangement in Randomized Complete Blocks with 3 replicates. All treatments were applied within a week of planting. Nitrogen was applied as Calcium Ammonium Nitrate (27 % N), phosphorus as Triple Super Phosphate (46 % P2O5) and potassium as Muriate of Potash (K20). There was variation in response of sweetpotato tuber yield to fertilizer application. At Chitedze and Chitala N application did not affect the tuber yields but at Makoka the yields were significantly (p<0.05) increased by 3.1 t /ha (15.9 %) and 6.8 t /ha (34.9 %) with 30 and 60 kg N /ha, respectively. Phosphorus and potassium did not significantly increase the yields at Chitedze and Makoka but at Chitala the yields were increased significantly with P and K application, increasing by 3.6 t /ha (19.6 %) and 3.0 t /ha (16.3 %) with 30 and 60 kg P /ha and 8.9 and 16.2 % with 50 and 100 K /ha, respectively. At Makoka it was economically justifiable to apply up to 60 kg N /ha but at Chitala while it was economically justifiable to apply up to 100 kg K /ha it was not economically justifiable to apply more than 30 kg P /ha. Tuber dry matter content was not affected by fertilizer application except at Chitedze where the DM content was significantly reduced with 30 kg P /ha. The tuber eating qualities were not affected by fertilizer application.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 14
Claim · model-written summary
Nitrogen did not affect tuber yield at Chitedze and Chitala.
- Taxon
- sweetpotato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- N applicatione0
- Outcome
- tuber yieldse0
- Direction
- did not affecte0
- Setting
- Chitedze and Chitalae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e0“At Chitedze and Chitala N application did not affect the tuber yields”
t0“sweetpotato”
Claim · model-written summary
At Makoka, 30 kg N /ha increased yield by 3.1 t /ha (15.9%).
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 30e0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 3.1 t /ha (15.9 %)e0
- Setting
- Makokae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Makoka the yields were significantly (p<0.05) increased by 3.1 t /ha (15.9 %) and 6.8 t /ha (34.9 %) with 30 and 60 kg N /ha, respectively”
t0“sweetpotato”
Claim · model-written summary
At Makoka, 60 kg N /ha increased yield by 6.8 t /ha (34.9%).
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 60 kg N /hae0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 6.8 t /ha (34.9 %)e0
- Setting
- Makokae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Makoka the yields were significantly (p<0.05) increased by 3.1 t /ha (15.9 %) and 6.8 t /ha (34.9 %) with 30 and 60 kg N /ha, respectively”
t0“sweetpotato”
Claim · model-written summary
P and K did not significantly increase yield at Chitedze and Makoka.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- Phosphorus and potassiume0
- Outcome
- yieldse0
- Direction
- did not significantly increasee0
- Setting
- Chitedze and Makokae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus and potassium did not significantly increase the yields at Chitedze and Makoka”
t0“sweetpotato”
Claim · model-written summary
At Chitala, 30 kg P /ha increased yield by 3.6 t /ha (19.6%).
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 30e0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 3.6 t /ha (19.6 %)e0
- Setting
- Chitalae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Chitala the yields were increased significantly with P and K application, increasing by 3.6 t /ha (19.6 %) and 3.0 t /ha (16.3 %) with 30 and 60 kg P /ha”
t0“sweetpotato”
Claim · model-written summary
At Chitala, 60 kg P /ha increased yield by 3.0 t /ha (16.3%).
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 60 kg P /hae0
- Outcome
- yieldse0
- Direction
- increasede0
- Value
- 3.0 t /ha (16.3 %)e0
- Setting
- Chitalae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Chitala the yields were increased significantly with P and K application, increasing by 3.6 t /ha (19.6 %) and 3.0 t /ha (16.3 %) with 30 and 60 kg P /ha”
t0“sweetpotato”
Claim · model-written summary
At Chitala, 50 K /ha increased yield by 8.9%.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“8.9 and 16.2 % with 50 and 100 K /ha, respectively”
e1“the yields were increased significantly with P and K application”
t0“sweetpotato”
e2“At Chitedze and Chitala N application did not affect the tuber yields”
Claim · model-written summary
At Chitala, 100 K /ha increased yield by 16.2%.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“8.9 and 16.2 % with 50 and 100 K /ha, respectively”
e1“the yields were increased significantly with P and K application”
t0“sweetpotato”
e2“At Chitedze and Chitala N application did not affect the tuber yields”
Claim · model-written summary
Up to 60 kg N /ha was economically justified at Makoka.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- economically justifiable to apply up to 60 kg N /hae0
- Setting
- Makokae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Makoka it was economically justifiable to apply up to 60 kg N /ha”
t0“sweetpotato”
Claim · model-written summary
Up to 100 kg K /ha was economically justified at Chitala.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- economically justifiable to apply up to 100 kg K /hae0
- Setting
- Chitalae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at Chitala while it was economically justifiable to apply up to 100 kg K /ha”
t0“sweetpotato”
Claim · model-written summary
More than 30 kg P /ha was not economically justified at Chitala.
- Taxon
- sweetpotatoIpomoea batatast0
- Outcome
- not economically justifiable to apply more than 30 kg P /hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it was not economically justifiable to apply more than 30 kg P /ha”
t0“sweetpotato”
Claim · model-written summary
Fertilizer did not affect tuber dry matter except at Chitedze.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- fertilizer applicatione0
- Outcome
- Tuber dry matter contente0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber dry matter content was not affected by fertilizer application except at Chitedze”
t0“sweetpotato”
Claim · model-written summary
At Chitedze, 30 kg P /ha significantly reduced dry matter.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- 30 kg P /hae0
- Outcome
- DM contente0
- Direction
- reducede0
- Setting
- Chitedzee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DM content was significantly reduced with 30 kg P /ha”
e1“Chitedze where the DM content was significantly reduced”
t0“sweetpotato”
Claim · model-written summary
Fertilizer did not affect tuber eating qualities.
- Taxon
- sweetpotatoIpomoea batatast0
- Treatment
- fertilizer applicatione0
- Outcome
- tuber eating qualitiese0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tuber eating qualities were not affected by fertilizer application”
t0“sweetpotato”
The same questions in other papers
potassium · yield · Ipomoea batatas (sweet potato)Results differ
2 papers in the same direction as this paper · 32 in the opposite direction
- positive
- positive
- positive
31 papers more in this group
See all 35 papers →nitrogen · yield · Ipomoea batatas (sweet potato)Results differ
30 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- no effect
31 papers more in this group
See all 35 papers →fertilization · quality: grain · Ipomoea batatas (sweet potato)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →phosphorus · yield · Ipomoea batatas (sweet potato)Positive and negative results
3 papers in the same direction as this paper · 19 in the opposite direction
- positive
- positive
- positive
19 papers more in this group
See all 23 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.