Growth, phenological and yield responses of a bambara groundnut (&lt;i&gt;Vigna subterranea&lt;/i&gt; L. Verdc) landrace to imposed water stress: II. Rain shelter conditions

Mabhaudhi, Tafadzwanashe; Modi, Albert T.; Beletse, Y.G.

doi:10.4314/wsa.v39i2.2

Cited by 39 publications

(54 citation statements)

References 31 publications

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“…Reported drought responses displayed in bambara groundnut include; reduced vegetative period, early flowering, reduced reproductive stage and also an earlier final maturity date in response to water stress (Mabhaudhi et al 2013). Landraces from Jozini, South Africa, such as 'Red' and 'Brown' landraces had an earlier maturity date (p \ 0.01) when the plants were stressed at 30 % of the crop water requirement (ETa; mean: 122.75 DAP) as compared to 100 % ETa (mean: 128 DAP) (Mabhaudhi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Landraces from Jozini, South Africa, such as 'Red' and 'Brown' landraces had an earlier maturity date (p \ 0.01) when the plants were stressed at 30 % of the crop water requirement (ETa; mean: 122.75 DAP) as compared to 100 % ETa (mean: 128 DAP) (Mabhaudhi et al 2013). Paraheliotropic movement has been observed in some drought-stressed bambara groundnut landraces, such as AS-17 (Stadler 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Landrace differences for drought response have been reported (Berchie et al 2012;Mabhaudhi et al 2013). …”

Section: Introductionmentioning

confidence: 99%

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Effects of mild drought stress on the morpho-physiological characteristics of a bambara groundnut segregating population

2015

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Bambara groundnut (Vigna subterranea (L) Verdc.) is a drought tolerant underutilised indigenous African legume. The present study aimed to examine the response of bambara groundnut under increasing drought stress and the effects of cumulative mild drought on final yields. The components of morpho-physiological traits were measured for a small F 5 breeding cross of bambara groundnut exposed to progressive mild drought in controlled-environment tropical glasshouses. Drought stress reduced stomatal conductance significantly (F (1,130) = 2259.59, p \ 0.01), with variation observed between lines of the segregating population (F (64,130) = 16.27, p \ 0.01). Higher stomatal density and reduced leaf area were observed in drought treatment plants (p \ 0.01). Mild drought stress negatively influenced 100-seed weight (F (1,258) = 19.4, p \ 0.01) and harvest index (F (1,258) = 12.87, p \ 0.01) by 8 and 15.6 %, compared to the control irrigated treatment, respectively. Bambara groundnut used a combination of mechanisms to tolerate drought stress, including stomatal regulation of gas exchange, reduction of leaf area and maintenance of a relatively high leaf water status and relatively high levels of photosynthesis. Strong genotypic variation observed for many traits in the F 5 segregating population allows individual lines with potentially greater tolerance for drought, combined with higher yielding characteristics, to be selected for future breeding programmes in bambara groundnut.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of mild drought stress on the morpho-physiological characteristics of a bambara groundnut segregating population

2015

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“…Soils at Ukulinga were described as shallow clayey to clayey loam with medium fertility (Mabhaudhi et al, 2013), which was matched with Clay_Shallow_MF_101mm (Table 2) in the APSIM soil file. Soils from Richards Bay were described as relatively deep and sandy with low fertility (Motsa et al, 2015), and were matched to Sandy_Medium_LF_111 mm (Table 3) in the APSIM soil file.…”

Section: Soilmentioning

confidence: 99%

Assessment of sorghum–cowpea intercrop system under waterlimited conditions using a decision support tool

Chimonyo

Modi

Mabhaudhi

2016

WSA

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Intercropping can improve crop productivity through increased water use efficiency (WUE). However, limited information exists to support its adoption and subsequent management. In such instances, crop models can be used as decision support tools to complement data from field trials. The Agricultural Production Systems Simulator Model (APSIM) was used to develop best management practices for improved yield and WUE for a sorghum-cowpea intercrop system for 5 sites in KwaZulu-Natal, South Africa: Richards Bay, Umbumbulu, Deepdale, Wartburg and Ukulinga. Each site represented 1 of 5 different bio-resource units. Planting dates (trigger season climate method, modelling and fixed date approaches), fertilizer rates (0, 50 and 100% recommended N rate), plant population (50% less and 50% more, for either sorghum or cowpea) and irrigation (deficit irrigation and rainfall-based approaches) were considered. In Deepdale, planting dates generated by the model gave high (952.2±85 and 326.3±68 kg•ha -1 ) and stable yields for sorghum and cowpea, respectively. Adding 100% fertilizer improved both yield and WUE of the intercrop by 18.5 and 5.1%, respectively, in Umbumbulu and Wartburg. Across all environments, sorghum and cowpea plant populations of 39 000 and 13 000 plants•ha -1 , respectively, increased yield (26.11%) and WUE (15.54%) of the intercrop system. Deficit irrigation was more effective resulting in yield (12.84%) and WUE (11.09%) improvements. It is concluded that APSIM can be used to develop best management practices to assist in developing guidelines for improving productivity of intercrop systems under water-scarce conditions.

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“…Seeds of a locally grown bambara groundnut landrace were collected from subsistence farmers in Jozini (27°26′ S, 32°4′ E), KwaZulu–Natal, and sorted into three distinct colors: Red, Light brown and Brown. The three seed colors were used in pot (Mabhaudhi et al, 2011), field (Mabhaudhi and Modi, 2013), and rain shelter studies (Mabhaudhi et al, 2013) to develop model inputs. The results from these experiments showed that the Red landrace selection was adapted to water‐limited conditions and was possibly drought tolerant.…”

Section: Methodsmentioning

confidence: 99%

Parameterization and Testing of AquaCrop for a South African Bambara Groundnut Landrace

2014

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e aim of this study was to parameterize and test the generic crop model AquaCrop for a local bambara groundnut [Vigna subterranea (L.) Verdc] landrace. Such a model should be water driven and assist in the promotion of neglected and underutilized species as possible future crops under water-limited conditions. AquaCrop was parameterized for a South African bambara groundnut landrace using data from controlled eld and rain shelter experiments conducted during two seasons (2010/2011 and 2011/2012) at Pretoria, South Africa. Observed weather, soil physical, and measured crop parameters from optimum experiments conducted during 2010/2011 were used to develop respective climate, soil, and crop les in AquaCrop and to parameterize the model. Model parameterization for bambara groundnut showed a very good t for canopy cover (R 2 = 0.94, Willmott's d index of agreement = 0.99, RMSE = 3.37%) and biomass (R 2 = 0.96, d index = 0.99, RMSE = 1.29 Mg ha -1 ). e model also predicted nal biomass (RMSE = 1.70 Mg ha -1 ) and yield (RMSE = 0.29 Mg ha -1 ) reasonably well. Model testing showed good t for canopy cover under irrigated (R 2 = 0.86, d index = 0.96, RMSE = 9.72%) and rainfed eld conditions (R 2 = 0.95, d index = 0.97, RMSE = 6.18%) compared with simulation of results from rain shelter experiments. e model simulated nal biomass and yield of bambara groundnut very well under eld conditions. e model's performance under rainfed conditions make it particularly suited for extrapolation to marginal areas of agricultural production in South Africa and the region.

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Growth, phenological and yield responses of a bambara groundnut (<i>Vigna subterranea</i> L. Verdc) landrace to imposed water stress: II. Rain shelter conditions

Cited by 39 publications

References 31 publications

Effects of mild drought stress on the morpho-physiological characteristics of a bambara groundnut segregating population

Effects of mild drought stress on the morpho-physiological characteristics of a bambara groundnut segregating population

Assessment of sorghum–cowpea intercrop system under waterlimited conditions using a decision support tool

Parameterization and Testing of AquaCrop for a South African Bambara Groundnut Landrace

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