Effect of Fertilizer Mixture and Time of Application on Crop Establishment and Root Yield of Sweet Potato in an Ultisol of South Eastern Nigeria

Onunka, NA; Osodeke, V. E.; Asawalam, D. O.; Ebeniro, CN

doi:10.4314/as.v10i3.3

Cited by 3 publications

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“…1 However, production and productivity in SSA is constrained by various biotic and abiotic stresses. [2][3][4] Breeding programs in Uganda have successfully developed new varieties with improved agronomic characteristics and nutritional value. [5][6][7][8] Recognizing that adoption rather than release was a better indicator of breeding efficiency, 9 the previously centralized breeding approach of the staple was decentralized by transitioning to a participatory sweetpotato breeding model.…”

Section: Introductionmentioning

confidence: 99%

“…Sweetpotato [ Ipomoea batatas (L.) Lam] is the second most important root crop in sub‐Saharan Africa (SSA), as indicated by its high production and role in food security 1 . However, production and productivity in SSA is constrained by various biotic and abiotic stresses 2‐4 . Breeding programs in Uganda have successfully developed new varieties with improved agronomic characteristics and nutritional value 5‐8 .…”

Section: Introductionmentioning

confidence: 99%

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Decision tree scoring system to guide selection for consumer preference in sweetpotato breeding trials

Nakitto,

Ssali,

Johanningsmeier

et al. 2023

J Sci Food Agric

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BACKGROUNDPreviously, a lexicon and protocol for quantitative descriptive analysis (QDA) was established for the Uganda sweetpotato breeding program. The implication of QDA scores for priority sensory attributes on consumer preference should be determined to interpret results efficiently and make decisions effectively. The present study aimed to develop a gender‐responsive decision tree to obtain an overall sweetpotato eating quality score to facilitate demand‐led targeted breeding selection. It focused on Kamuli and Hoima districts (Uganda) and uses pre‐lease advanced clones (‘NKB3’, ‘NKB105’, ‘NKB135’, ‘D11’ and ‘D20’), released varieties (‘NASPOT 8’ and ‘NAROSPOT 1’) and landraces (‘Muwulu‐Aduduma’, ‘Umbrella’).RESULTSIncluding boiled sweetpotato sensory characteristics, namely mealy, sweet taste, sweetpotato smell, firm and not fibrous, in breeding design would benefit end‐users, especially women given their role in varietal selection, food preparation and marketing. ‘D20’, ‘NASPOT 8’ and ‘NAROSPOT 1’ were most liked in both districts. ‘NKB3’ and ‘D11’ were the least liked in Hoima, whereas ‘Muwulu‐Aduduma’ was the least liked in Kamuli. There was a positive correlation between color and overall liking (r2 = 0.8) and consumers liked the color (average rating ≥ 6 on a nine‐point hedonic scale) of all genotypes. Threshold values (average rating on 11‐point scales) for consumer acceptability were identified (sweet taste = 6, sweetpotato aroma and flavor = 6, firmness = 3, and mealiness = 4). A regression decision tree tool was created to calculate an eating quality selection index when screening lines in breeding programs using the values.CONCLUSIONDecision trees that include consumer needs and gender considerations would facilitate demand‐led breeding and make varietal selection in sweetpotato breeding programs more effective. © 2023 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decision tree scoring system to guide selection for consumer preference in sweetpotato breeding trials

Nakitto,

Ssali,

Johanningsmeier

et al. 2023

J Sci Food Agric

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“…Wu et al [ 5 ] found that the shoot biomass of purple sweetpotato increased with the increase of N application under higher soil fertility. Studies of the relationships between N fertilizer and photosynthesis, growth, yield, and quality in sweetpotato have been reported previously [ 18 , 20 , 21 , 22 ]. However, differences in photosynthate distribution and transport in sweetpotato cultivars with different N tolerances under different N conditions have rarely been investigated.…”

Section: Introductionmentioning

confidence: 99%

Differences between nitrogen-tolerant and nitrogen-susceptible sweetpotato cultivars in photosynthate distribution and transport under different nitrogen conditions

et al. 2018

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To characterize the differences in photosynthate distribution and transport between nitrogen(N)-tolerant and N-susceptible sweetpotato cultivars under different N conditions, three N levels, including 0 (N0), 120 (N120), and 240 kg ha−1 (N240), were used in field experiments with the Jishu26 (J26) and Xushu32 (X32) cultivars in 2015 and 2016. The results from both years revealed that high N application reduced the tuberous root yield, the tuber/vine rate of carbon-13 (13C), and top-to-base (three equal segments of stem divided from the fifth opened leaf of the shoot tip to the main stem, defined as the top, middle, and base parts, respectively) gradients such as sucrose, ammonia N and potassium along the stem. ‘J26’ showed a higher yield than ‘X32’ under N0 but lower yield than ‘X32’ under N120 and N240. It also exhibited a higher 13C distribution to tuberous roots compared with that of ‘X32’ under N0, and the opposite trend was observed under N120 and N240. Under N0, ‘J26’ showed a steep top-to-base amino acid gradient and a significantly lower top-to-base sucrose increase along the stem in the late growth stage. Under N120 and N240, ‘X32’ exhibited a greater top-to-base decrease in the ammonia N along the stem during the main growth stages, a steep top-to-base sucrose gradient along the stem in the early growth stage, and a lower top-to-base sucrose increase along the stem in the middle and late growth stages. The formation of a reasonable photosynthate distribution structure attributed to high yield was related to a desirable sucrose, ammonia N or K+ gradient downward along the stem. These results might help provide farmers with sweetpotato cultivars using less or no N fertilizer in soils of different fertility and enhance the knowledge of yield-related physiology.

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“…In [4] investigated the varietal response of the crop to different to nitrogen fertilization, [5] also investigated the effect of nutrient application on the crop establishment and root yield. [6] reported the effect of organic manure on the growth and yield of sweet potato, [7] reported the performance of introduced and locally bred genotypes in multi agro ecological zone all in the bid to improve the yield.…”

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confidence: 99%

Integrating Agronomic Practices for the Mitigation of Crack Formation on Sweet Potato Roots at Umudike, South Eastern Nigeria

Onunka¹,

Njoku²,

Ehisianya³

2017

ujar

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Field experiment was conducted in 2013 cropping season to evaluate the effect of integrating different agronomic practices for mitigating crack formation on sweet potato (Ipomoea batatas) roots. Cracks are malformations on the edible roots of sweet potato which make them look unattractive, form portals for disease and pest invasion, lead to decay and high peeling loss, and reduce marketability and acceptability. The agronomic practices evaluated included; two nutrient sources NPK 20:10:10 and 15:15:15, four different harvest periods 3, 4, 5, and 6 months after planting (MAP) on the three varieties of sweet potato namely TIS87/0087, UMUSPO/1 and CIP440293. It was carried out at the Eastern farm of National Root Crops Research Institute Umudike Abia State which lies between latitude 4 0 15 1 and 7 0 N and longitude 15 0 29 1 N and 7 0 33 1 E at an elevation of 122m above sea level. The experimental design was a split plot arrangement fitted into a randomized complete block design, main plot was nutrient source, subplot was time of harvest, and sub subplot was variety. There were thirty six treatments replicated three times. The soil was classified as sandy loam. Data were collected on number of roots with cracks, total root number, total root fresh weight, and rot incidence. Results showed that the effect of the nutrient sources was not statistically significant at (P≤0.05) on crack formation more cracks were recorded on varieties UMUSPO/1 and CIP440293 (orange-fleshed) than TIS87/0087 (white-fleshed). Time of harvest was very highly significant (P<0.001) on number of roots with cracks. From this work it can be concluded that time of harvest and variety played important roles in the formation of the cracks in the tuberous roots of sweet potato which reduce the quality of the crop. The type of fertilizer used has no effect on the crack formations, root size and number while early harvest is recommended.

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Effect of Fertilizer Mixture and Time of Application on Crop Establishment and Root Yield of Sweet Potato in an Ultisol of South Eastern Nigeria

Cited by 3 publications

References 2 publications

Decision tree scoring system to guide selection for consumer preference in sweetpotato breeding trials

Decision tree scoring system to guide selection for consumer preference in sweetpotato breeding trials

Differences between nitrogen-tolerant and nitrogen-susceptible sweetpotato cultivars in photosynthate distribution and transport under different nitrogen conditions

Integrating Agronomic Practices for the Mitigation of Crack Formation on Sweet Potato Roots at Umudike, South Eastern Nigeria

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