Abstract
To assess the effect of pure castor meal and a mixture of castor meal with ground hydrothermalized phonolite rock (CM+HP mixture) in providing nutrients, particularly N and K, and optimizing yield and quality of sweet potato, a field experiment was conducted using a randomized block design. Treatments were the absence and presence of synthetic N and K fertilizers (ammonium nitrate and KCl) combined with rates of organic fertilizers (1.2 and 2.4 Mg ha−1 of castor meal, 2.25 and 4.5 Mg ha−1 of CM+HP mixture, plus a treatment without organic fertilizers). The CM+HP mixture maintained adequate N and K status in plant leaves. Organic fertilizers increased the number of storage roots per plant and the sweetness of the storage roots, while synthetic fertilizers increased the storage root mean weight. Castor meal combined with synthetic fertilizers improved soil health (increased organic matter and enzyme activity in the soil). The combined application of synthetic fertilizers with 2.4 Mg ha−1 of castor meal or 4.5 Mg ha−1 of CM+HP mixture had the greatest benefit on storage root yield, with an average increase of 128% (10.9 Mg ha−1) on marketable storage root yield, and the nutrient removal compared with the sole application of organic fertilizers.
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Claims 6
Claim · model-written summary
Organic fertilizers increased the number of storage roots per plant and the sweetness of the storage roots compared with no organic fertilizer.
- Taxon
- sweet potato
_Flower.jpg?width=60)
Ipomoea batatase7 - Treatment
- Organic fertilizerse1
- Outcome
- number of storage roots per plant and the sweetness of the storage rootse1
- Direction
- increasede1
- Comparator
- a treatment without organic fertilizerse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Flower.jpg?width=500)
Verbatim
e7“optimizing yield and quality of sweet potato”
e1“Organic fertilizers increased the number of storage roots per plant and the sweetness of the storage roots”
e6“plus a treatment without organic fertilizers”
Claim · model-written summary
Synthetic fertilizers increased the mean weight of storage roots compared with the absence of synthetic fertilizers.
- Taxon
- sweet potatoIpomoea batatase7
- Treatment
- synthetic fertilizerse2
- Outcome
- storage root mean weighte2
- Direction
- increasede2
- Comparator
- absencee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“optimizing yield and quality of sweet potato”
e2“while synthetic fertilizers increased the storage root mean weight”
e6“Treatments were the absence and presence of synthetic N and K fertilizers”
Claim · model-written summary
The CM+HP mixture maintained adequate N and K status in sweet potato leaves.
- Taxon
- sweet potatoIpomoea batatase7
- Treatment
- CM+HP mixturee3
- Outcome
- N and K status in plant leavese3
- Qualifier
- adequatee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“optimizing yield and quality of sweet potato”
e3“The CM+HP mixture maintained adequate N and K status in plant leaves”
Claim · model-written summary
Synthetic fertilizers combined with castor meal or CM+HP mixture gave an average 128% increase in marketable storage root yield compared with the sole application of organic fertilizers.
- Taxon
- sweet potatoIpomoea batatase7
- Treatment
- combined application of synthetic fertilizers with 2.4 Mg ha−1 of castor meal or 4.5 Mg ha−1 of CM+HP mixturee4
- Outcome
- marketable storage root yielde4
- Direction
- increasee4
- Value
- 128%e4
- Qualifier
- 10.9 Mg ha−1e4
- Comparator
- the sole application of organic fertilizerse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“optimizing yield and quality of sweet potato”
e4“The combined application of synthetic fertilizers with 2.4 Mg ha−1 of castor meal or 4.5 Mg ha−1 of CM+HP mixture had the greatest benefit on storage root yield, with an average increase of 128% (10.9 Mg ha−1) on marketable storage root yield, and the nutrient removal compared with the sole application of organic fertilizers”
Claim · model-written summary
Castor meal combined with synthetic fertilizers increased soil organic matter and enzyme activity in sweet potato fields.
- Taxon
- sweet potatoIpomoea batatase7
- Treatment
- Castor meal combined with synthetic fertilizerse5
- Outcome
- organic matter and enzyme activity in the soile5
- Direction
- increasede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“optimizing yield and quality of sweet potato”
e5“Castor meal combined with synthetic fertilizers improved soil health (increased organic matter and enzyme activity in the soil)”
Claim · model-written summary
Nutrient removal under the combined synthetic and organic application was reported against the sole organic application, with the combined treatment giving the greatest benefit.
- Taxon
- sweet potatoIpomoea batatase7
- Treatment
- combined application of synthetic fertilizers with 2.4 Mg ha−1 of castor meal or 4.5 Mg ha−1 of CM+HP mixturee4
- Outcome
- nutrient removale4
- Comparator
- the sole application of organic fertilizerse4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“optimizing yield and quality of sweet potato”
e4“The combined application of synthetic fertilizers with 2.4 Mg ha−1 of castor meal or 4.5 Mg ha−1 of CM+HP mixture had the greatest benefit on storage root yield, with an average increase of 128% (10.9 Mg ha−1) on marketable storage root yield, and the nutrient removal compared with the sole application of organic fertilizers”
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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.