Abstract
The high cost of mineral fertilizers, lack of credit, and delivery delays constrain crop production in the developing world like Ethiopia. Farmers apply little or no fertilizer to sweet potatoes leading to lower root yield (8 t ha −1 ) compared with 60 t ha −1 in research fields. Eventually, this has led to a decline in food security. Although the rate depends on many factors, organic inputs such as vermicomposts are suggested as alternatives or combined with mineral fertilizers. This research was therefore initiated to investigate the effect of the combined application of vermicompost (VC) and mineral K fertilizer on the root yield of sweet potatoes. Treatments were 0, 4, 8, or 12 t ha −1 VC and 0, 50, 100, or 150 kg ha −1 K laid out in a Randomized Complete Block Design, factorial arrangement with three replications. The combined application of 12 t VC ha −1 with 150 kg K ha −1 produced the highest total root yield (57.35 t ha −1 ), marketable root yield (46.45 t ha −1 ), and harvest index (16.5 %). These values were comparable to those of 8 t VC ha −1 and 150 kg K ha −1 . Dry matter content was increased by 35.5 % in location-1 and 38.2 % in location-2 at combined rates of 12 t VC ha −1 and 150 kg K ha −1 that did not differ from 8 t VC ha −1 and 150 kg K ha −1 . Root diameter, dry matter content, harvest index, marketable, and total root yield had a strong positive relationship. Applying 8 t VC ha −1 with 150 kg K can improve root yield aboveground biomass of sweet potato.
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Claims 9
Claim · model-written summary
Combined 12 t VC ha-1 and 150 kg K ha-1 gave the highest total root yield.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatast0 - Treatment
- combined application of 12 t VC ha −1 with 150 kg K ha −1e1
- Outcome
- total root yielde1
- Direction
- higheste1
- Value
- 57.35 t ha −1e1
- Setting
- Southern Ethiopiat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e1“The combined application of 12 t VC ha −1 with 150 kg K ha −1 produced the highest total root yield (57.35 t ha −1), marketable root yield (46.45 t ha −1), and harvest index (16.5 %)”
Claim · model-written summary
Combined 12 t VC ha-1 and 150 kg K ha-1 gave a higher marketable root yield.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- combined application of 12 t VC ha −1 with 150 kg K ha −1e1
- Outcome
- marketable root yielde1
- Direction
- higherinferrede1
- Value
- 46.45 t ha −1e1
- Setting
- Southern Ethiopiat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e1“The combined application of 12 t VC ha −1 with 150 kg K ha −1 produced the highest total root yield (57.35 t ha −1), marketable root yield (46.45 t ha −1), and harvest index (16.5 %)”
Claim · model-written summary
Combined 12 t VC ha-1 and 150 kg K ha-1 gave a higher harvest index.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- combined application of 12 t VC ha −1 with 150 kg K ha −1e1
- Outcome
- harvest indexe1
- Direction
- higherinferrede1
- Value
- 16.5 %e1
- Setting
- Southern Ethiopiat0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e1“The combined application of 12 t VC ha −1 with 150 kg K ha −1 produced the highest total root yield (57.35 t ha −1), marketable root yield (46.45 t ha −1), and harvest index (16.5 %)”
Claim · model-written summary
Root yields under 12 t VC ha-1 with 150 kg K ha-1 were comparable to those under 8 t VC ha-1 with 150 kg K ha-1.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- combined application of 12 t VC ha −1 with 150 kg K ha −1e1
- Outcome
- These valuese2
- Direction
- comparablee2
- Comparator
- 8 t VC ha −1 and 150 kg K ha −1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e1“The combined application of 12 t VC ha −1 with 150 kg K ha −1 produced the highest total root yield (57.35 t ha −1), marketable root yield (46.45 t ha −1), and harvest index (16.5 %)”
e2“These values were comparable to those of 8 t VC ha −1 and 150 kg K ha −1”
Claim · model-written summary
Dry matter content increased by 35.5 % in location-1 under 12 t VC ha-1 with 150 kg K ha-1.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- combined rates of 12 t VC ha −1 and 150 kg K ha −1e3
- Outcome
- Dry matter contente3
- Direction
- increasede3
- Value
- 35.5 %e3
- Qualifier
- did not differ from 8 t VC ha −1 and 150 kg K ha −1e3
- Setting
- location-1e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e3“Dry matter content was increased by 35.5 % in location-1 and 38.2 % in location-2 at combined rates of 12 t VC ha −1 and 150 kg K ha −1 that did not differ from 8 t VC ha −1 and 150 kg K ha −1”
Claim · model-written summary
Dry matter content increased by 38.2 % in location-2 under 12 t VC ha-1 with 150 kg K ha-1.
- Taxon
- sweet potatoIpomoea batatast0
- Treatment
- combined rates of 12 t VC ha −1 and 150 kg K ha −1e3
- Outcome
- Dry matter contente3
- Direction
- increasede3
- Value
- 38.2 %e3
- Qualifier
- did not differ from 8 t VC ha −1 and 150 kg K ha −1e3
- Setting
- location-2e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e3“Dry matter content was increased by 35.5 % in location-1 and 38.2 % in location-2 at combined rates of 12 t VC ha −1 and 150 kg K ha −1 that did not differ from 8 t VC ha −1 and 150 kg K ha −1”
Claim · model-written summary
Root diameter, dry matter content and harvest index had a strong positive relationship.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- Roote4
- Outcome
- Root diameter, dry matter content, harvest indexe4
- Direction
- positivee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e4“Root diameter, dry matter content, harvest index, marketable, and total root yield had a strong positive relationship”
Claim · model-written summary
Marketable and total root yield had a strong positive relationship with the other traits.
- Taxon
- sweet potatoIpomoea batatast0
- Organ / stage
- Roote4
- Outcome
- marketable, and total root yielde4
- Direction
- positivee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Combined application of vermicompost and mineral K fertilizer improves root yield of sweet potato [Ipomoea batatas (L.) Lam] in Southern Ethiopia”
e4“Root diameter, dry matter content, harvest index, marketable, and total root yield had a strong positive relationship”
Claim · model-written summary
Applying 8 t VC ha-1 with 150 kg K can improve root yield and aboveground biomass of sweet potato.
- Taxon
- sweet potatoIpomoea batatase5
- Treatment
- Applying 8 t VC ha −1 with 150 kg Ke5
- Outcome
- root yield aboveground biomasse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Applying 8 t VC ha −1 with 150 kg K can improve root yield aboveground biomass of sweet potato”
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