Growth and yield responses of sweet potato to inorganic nitrogen and potassium in a tropical ultisol

Njoku, J. C.; Okpara, D. A.; Asiegbu, J. E.

doi:10.4314/naj.v32i1.49366

Cited by 16 publications

(23 citation statements)

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“…Across the years , the 120kg/ha rate produced more than one and a half times the total number of tubers obtained from the control plots (Table 5). This agrees with the findings of Njoku et al (2001) and Trehan et al (2009). Tuber yield increased with added K up to the highest rate (160 kg/ha), suggesting that the K application increased yield through the formation of large sized tubers.…”

Section: Discussionsupporting

confidence: 83%

“…Optimum tuber yield of sweet potato has been obtained by applying 150-300 kg K 2 O/ha (Jian-wei et al, 2001), Trehan et al (2009) also obtained optimum tuber yield with 120 kg K 2 O/ha, while the maximum yield was at 160 kg K 2 O/ha. Our results conform with the reports by IFA (1991), Njoku et al (2001) and Degras (2003) that the application of 80-170 kg K 2 O/ha may be adequate www.ccsenet.org/jas Journal of Agricultural Science Vol. 5, No.…”

supporting

confidence: 82%

“…Njoku et al (2001) had earlier reported that N and K were critical to sweet potato production, while Trehan et al (2009) observed that K increased vine length, crop vigour, leaf expansion particularly at early stages of growth and extended leaf area duration. This positive response of growth characters to the applied K is attributable to its role in cell multiplication and photosynthesis in conjunction with N, which gave rise to increase in length of vine, number of leaves and branches and consequent heavier dry weights of vine.…”

Section: Discussionmentioning

confidence: 99%

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Growth and Yield Response of Improved Sweet Potato (Ipomoea batatas (L.) Lam) Varieties to Different Rates of Potassium Fertilizer in Calabar, Nigeria

Uwah¹,

Undie²,

John³

et al. 2013

JAS

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A two-year field study was conducted during the growing seasons of 2007 and 2008 in Calabar, south eastern Nigeria to evaluate the response of two improved sweet potato varieties (TIS 8164 and Ex-Igbariam) to five rates (0, 40, 80, 120 and 160 kg K/ha)of potassium fertilizer. Factorial combinations of the treatments were arranged into a randomized complete block design with three replications. Results showed that Ex-Igbariam was more responsive to K application than TIS8164 as indicated by the production of longer vines, higher number of leaves and branches/plant and heavier vine dry weight at all the applied K rates. Averaged across the two years, revealed that Ex-Igbariam out-yielded TIS8164 by 12.5, 12.7 and 13.3% for number of tubers/plant, weight of tubers/plant and tuber yield/ha, respectively. Application of K at the highest rate (160 kg/ha) significantly (P<0.05) increased vine length, number of leaves and branches/plant, whereas dry weight of vine, diameter of tubers/plant and weight of tubers/plant were statistically similar at 120 and 160 kg K/ha rates. Number of tubers/plant and tuber yield/ha peaked at 120 kg K/ha and 160 kg K/ha, respectively. Aggregate tuber yield/ha obtained at 120 and 160 kg K/ha rates were more than 7 and 8 times, respectively higher than the control treatments. Potassium fertilizer application at 120 to 160 kg/ha appeared appropriate for optimum yield for Ex-Igbariam in the study area and is therefore recommended.

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Section: Discussionsupporting

confidence: 83%

supporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Growth and Yield Response of Improved Sweet Potato (Ipomoea batatas (L.) Lam) Varieties to Different Rates of Potassium Fertilizer in Calabar, Nigeria

Uwah¹,

Undie²,

John³

et al. 2013

JAS

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“…Significantly higher root:vine yield ratio, harvest and commercial harvest indexes (Table 3) obtained with the application of DPKC either singly or in combination with PM compared to PM application alone, demonstrate the relevance of N:K ratios in fertilizers on sweet potato tuber weight and sizes and vine yield as reported by Norman et al (1984) and Njoku et al (2001). These workers in separate locations observed that fertilizers with lower N: K ratios promoted higher root:vine yield ratio and harvest index.…”

Section: Discussionmentioning

confidence: 52%

“…The yield increase recorded with the application of any of the organic waste (PM or DPKC or their combination) could be attributed to their nutrient content such as N and K as shown in Table 1. Several studies (Norman et al, 1984;Jian-weil et al, 2001;Njoku et al, 2001) have shown the critical importance of N and K ins the nutrition of sweet potato.…”

Section: Discussionmentioning

confidence: 99%

Effect of Poultry Manure, Defatted Palm Kernel Cake and Their Combinations on the Yield Performance of Sweet Potato (Ipomoea batatas (L.) Lam) and Chemical Characteristics of a Sandy Loam Ultisol of South-Eastern Nigerian

Okore¹,

Okonkwo²,

Osuaku³

2015

JAS

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A two-year (2010 and 2011 cropping seasons) field trial was carried out on a Sandy loam Ultisol in south-eastern Nigeria to evaluate the effect of Poultry manure (PM), Defatted palm kernel cake (DPKC) and their combinations (PM + DPKC) on the yield of sweet potato and soil chemical properties. The experiment was laid-out in a randomised complete block design with the treatments consisting of PM, DPKC, PM + DPKC (1:1 by weight) applied at the rates of 5 and 10 t ha -1 each and a control (no soil amendment).The treatments were replicated four times. A significantly (P ≤ 0.05) higher sweet potato yield performances and improved soil chemical characteristics were recorded from plots that received any of the soil amendments compared to the unamended (control plots). Apart from the combined application of PM and DPKC at the rate of 5 t ha -1 which gave a significantly higher yield values relative to single application of either PM or DPKC at similar rate; the effect of the other treatments at the same rate of application on the crop yield and yield related parameters did not differ significantly. However, plots that had either DPKC alone or in combination with PM gave a significantly higher root:vine yield ratio and commercial harvest index, irrespective of the rate of application. Similarly, combined application of PM and DPKC resulted in a significantly higher soil org. C, available P and exchangeable bases. The crop yield values and soil properties recorded from plots treated with PM + DPKC at the rates of 5 and 10 t ha -1 did not differ significantly, hence combined application of PM and DPKC at the rate of 5 t ha -1 could be considered suitable for sweet potato yield and soil nutrient conservation for sandy loam ultisol of south-eastern Nigeria.

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Assessing the synergistic impacts of poultry manure and biochar on nutrient-depleted sand and sandy loam soil properties and sweet potato growth and yield

Agbede

Oyewumi²,

Adekiya³

et al. 2022

Ex. Agric.

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Summary Poultry manure (PM) has been shown to boost crop productivity. However, little is known about its favorable interactions with wood biochar (B) on sweet potato (Ipomoea batatas L.) growth and yield, and soil qualities. Hence, a 2-year field trial was conducted in the southwest Nigeria at two locations (Owo – site A and Obasooto – site B) to co-apply PM and wood B as soil amendments to boost sweet potato productivity and soil quality. The experiment consisted of a 3 × 4 factorial layout with three replications. PM and B significantly reduced soil bulk density and improved porosity and moisture content with their rate of application when compared to the control. As PM and B applications increased from 0 to 10.0 t ha−1 and 0 to 30.0 t ha−1, respectively, soil chemical properties and sweet potato growth and tuber yield increased. Co-application of 10.0 t ha−1 PM and 30.0 t ha−1 B increased tuber yield by 220% compared to treatments without PM or B. Significant synergistic interactions between PM and B were observed for all parameters. In comparison with other treatments, co-applying PM and B to sweet potato soils is a viable sustainable option for increasing sweet potato productivity and soil sustainability.

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Growth and yield responses of sweet potato to inorganic nitrogen and potassium in a tropical ultisol

Cited by 16 publications

References 0 publications

Growth and Yield Response of Improved Sweet Potato (Ipomoea batatas (L.) Lam) Varieties to Different Rates of Potassium Fertilizer in Calabar, Nigeria

Growth and Yield Response of Improved Sweet Potato (Ipomoea batatas (L.) Lam) Varieties to Different Rates of Potassium Fertilizer in Calabar, Nigeria

Effect of Poultry Manure, Defatted Palm Kernel Cake and Their Combinations on the Yield Performance of Sweet Potato (Ipomoea batatas (L.) Lam) and Chemical Characteristics of a Sandy Loam Ultisol of South-Eastern Nigerian

Assessing the synergistic impacts of poultry manure and biochar on nutrient-depleted sand and sandy loam soil properties and sweet potato growth and yield

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