Dioscorea

Bhattacharjee, Ranjana; Gedil, Melaku; Sartie, Alieu; Otoo, Emmanuel; Dumet, D.; Kikuno, Hidehiko; Kumar, P. Lava; Asiedu, Robert

doi:10.1007/978-3-642-21102-7_4

Cited by 19 publications

(12 citation statements)

References 108 publications

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“…The improved agronomic practice fields had significantly (P<0.01) higher total tuber yields compared to the farmers’ practice fields across the locations despite the season (Figs 2–4). Availability of moisture is critical for yam to sprout and establish during early growth stages and vital to bulk bigger tubers(11,17–20). Higher rainfall during 2015 cropping season (Fig 1) might have ensured yam establishment and increased overall yields compared to 2016.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, pre-treating seed yam before planting on the improved agronomic fields resulted in a reduction in yam rot and increased stands/ha than on the farmers’ practice fields where seeds were not treated resulting in lower stands/ha. Seed treatment for pest and disease before planting is recommended to promote sprout rate ensuring improvement in final stand density culminating into overall high yam yields (11,12,17). Erratic rainfall and prolong drought require technologies that enable the soil to conserve moisture and promote nutrient use efficiency in order to increase resiliency of any cropping system.…”

Section: Resultsmentioning

confidence: 99%

“…Predominantly amongst them are; inadequate rainfall, low soil fertility, weed infestation, pests and diseases in the field (foliar and soil borne) and inadequate storage facilities, attack by organisms such as rodents, access to quality improved seed, implements for mechanization etc. (8,11). Others include shortage of stakes especially from deforested areas and guinea savannah regions.…”

Section: Introductionmentioning

confidence: 99%

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Sustaining yam yields amidst climate threat in the forest – savannah transition zone of Ghana

Frimpong

Danquah

Ennin

et al. 2018

Preprint

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1516 With about 70% of yam tuber been water, yield is critically affected during bulking as a result 17 of onset of temporal drought. As a consequence of climate change, farmers who are into 18 Dioscorea rotundata (white yam) production for local and international market lose their 19 investments mainly due to erratic precipitation, drought spells culminating into low yields of 20 just 12t/ha compared to the potential of about 22-49t/ha depending on the variety. Innovative 21 land uses technologies with higher and sustained productivity for yam production are 22 imperative. This study verifies improved agronomic package for sustainable yam production 23 in yam growing areas in the forest -savannah transition zone of Ghana during the 2015 and 24 2016 cropping seasons. The improved agronomic package included use of ridging as seedbed, 25 seed treatment before planting, fertilizer application at a rate of 30:30:36 N:P 2 0 5 :K 2 0 kg/ha 26 plus 15 kg/ha Mg and 20 kg/ha S as MgSO 4 and the use of minimum stakes (trellis; 30-50% 27 less number of stakes used by farmers staking). This was compared with farmers' practice 28 which consisted of mounding, no fertilizer application and no seed treatment. The results 29 revealed significant (P ≤ 0.01) yam yields of more than 60% difference between the improved 30 agronomic practice and farmers' practice from Ejura, Atebubu and Kintampo yam growing 31 communities. Adoption of improved agronomic practices does not only sustain yam 32 production and address deforestation but also provide higher returns on investments 33 promoting climate resilience by small holders. Key Words35 Climate smart agriculture, Fertilizer, Improved technology, Seed treatment, Trellis staking, 36 Yam 37 38 Background 39 2 40 In Ghana, crops are already experiencing heat stress, drought spells, several pests and 41 diseases outbreak and shorter growing crop duration as a consequent of the changing climate 42 (1). Thus, a potential catastrophe for smallholder farmers and the millions of people who 43 regularly grow rain-fed full season crops such as yam, cocoyam, rice etc.(2-5). Choices about 44 what to grow are often dictated by the ability of the rainfall regime to support moisture for 45 plant growth (6). One way around this would be to breed for varieties with shorter crop 46 maturity durations or management interventions that build on the resilience of cropping 47 production systems to reduce shocks if the shocks from the climate change cannot be done 48 away with. Evidence suggests that climate smart agriculture can make a contribution to 49 mitigation by supporting more efficient use of fertilizers, weed management and reduced 50 staking options in yam production (1,7,8). 51 Yam, an important staple food crop across West Africa is a major non-traditional export 52 crop in Ghana contributing to about 16% of the National Agricultural Gross Domestic Product 53 (9,10). However, there are a number of challenges that hamper the production and 54 productivity of yam. Predominantly amongst them are; inade...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sustaining yam yields amidst climate threat in the forest – savannah transition zone of Ghana

Frimpong

Danquah

Ennin

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…Yam is a multi species crop and considered as one of the most important staple food crops of sub-Saharan Africa that provide valuable source of dietary carbohydrate and income (Bhattacharjee et al, 2011). Seeds, vines or tubers can be used biologically to propagate yams.…”

Section: Introductionmentioning

confidence: 99%

“…Farmers in West Africa bulk planting material (tubers, vines and setts) from both infected (symptomatic) and asymptomatic plants and use them indiscriminately for planting. This practice not only contributes to the spread of pests and pathogens along with the planting material but also affects the yields and gradual decline in source material (Bhattacharjee et al, 2011). Traditionally farmers obtain seed tubers by selecting small tubers (e.g.…”

Section: Introductionmentioning

confidence: 99%

In Vivo Yam (Dioscorea spp.) Vine Multiplication Technique: The Plausible Solution to Seed Yam Generation Menace

Otoo¹,

Anyakanmi²,

Kikuno³

et al. 2016

JAS

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<p>A study was conducted to develop a vine multiplication package for generation of seed yam. The parameters assessed for the package were rooting media of the vine cuttings, yam variety and nutrient supplementation to the mother plant to generate minitubers. Nine varieties of yams were planted in 4 media types (soil, soil + sawdust, soil + carbonized rice husk and cocopeat) and 2 levels of nutrient supplementation (no supplementation and supplementation) using RCBD with 3 replications. The study was conducted over 2-year period. Boosting the nutrient status of the mother plant before excising the vines proved to enhance establishment and subsequently the yield of the vine cuttings. Incorporation of biochar in the planting media also enhanced establishment of the vine cuttings and subsequent yields. Success of the vine multiplication techniques also proved to be variety dependent. An in vivo vine multiplication package has been developed for yam seed generation.</p>

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A customized nuclear target enrichment approach for developing a phylogenomic baseline for Dioscorea yams (Dioscoreaceae)

Gomez

Pokorny

Kantar³

et al. 2019

Appl Plant Sci

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Premise We developed a target enrichment panel for phylogenomic studies of Dioscorea , an economically important genus with incompletely resolved relationships. Methods Our bait panel comprises 260 low‐ to single‐copy nuclear genes targeted to work in Dioscorea , assessed here using a preliminary taxon sampling that includes both distantly and closely related taxa, including several yam crops and potential crop wild relatives. We applied coalescent‐based and maximum likelihood phylogenomic inference approaches to the pilot taxon set, incorporating new and published transcriptome data from additional species. Results The custom panel retrieved ~94% of targets and >80% of full gene length from 88% and 68% of samples, respectively. It has minimal gene overlap with existing panels designed for angiosperm‐wide studies and generally recovers longer and more variable targets. Pilot phylogenomic analyses consistently resolve most deep and recent relationships with strong support across analyses and point to revised relationships between the crop species D. alata and candidate crop wild relatives. Discussion Our customized panel reliably retrieves targeted loci from Dioscorea , is informative for resolving relationships in denser samplings, and is suitable for refining our understanding of the independent origins of cultivated yam species; the panel likely has broader promise for phylogenomic studies across Dioscoreales.

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Dioscorea

Cited by 19 publications

References 108 publications

Sustaining yam yields amidst climate threat in the forest – savannah transition zone of Ghana

Sustaining yam yields amidst climate threat in the forest – savannah transition zone of Ghana

In Vivo Yam (Dioscorea spp.) Vine Multiplication Technique: The Plausible Solution to Seed Yam Generation Menace

A customized nuclear target enrichment approach for developing a phylogenomic baseline for Dioscorea yams (Dioscoreaceae)

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