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Effects of sowing date on days to flowering, yield and grain quality of sorghum (sorghum bicolor l. moench)in the Nile corridor region of south Sudan

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dc.contributor.author KOK, MAJOK A. G.
dc.date.issued 2016-08
dc.date.accessioned 2017-04-03T07:18:35Z
dc.date.available 2017-04-03T07:18:35Z
dc.identifier.uri http://hdl.handle.net/123456789/739
dc.description.abstract Sorghum (Sorghum bicolor (L.) Moench) is an important crop in the arid and semi-arid lands (ASALs) where moisture is limited and rainfall is erratic. Late sowing, poor yields and lack of adequate nutrition are consistently a problem in South Sudan.The objectives of the study were to 1) determine the effect of sowing date on morphology and yield of sorghum varieties, 2) determine the effects of sowing date on protein, tannins, iron and zinc content of sorghums and 3) identify high yielding sorghum varieties. A field study was conducted under rain fed conditions in Bor and Arek locations of South Sudan. Five varieties; Beer, Akuorachot, Dhet, Aganyand Seredo were sown on 18th June, 29th June and 10th July in Bor and Arek locations. The experiment was 2 × 3× 5 factorialtreatments laid out in a randomised complete block design with three replications. Leaf area index, days to flowering, plant height, aboveground biomass, grain yield, harvest index and thousand seed mass were recorded. Laboratory grain quality analyses to determine protein, tannins, iron and zinc contentswere conducted. Significant site by variety by sowing dateinteraction was recorded for leaf area index, days to flowering, plant height, aboveground biomass, grain yield, harvest index and thousand seed mass. At Bor, 18thand 29th June sowing dates recorded mean grain yieldof 1.46 and 1.44t ha-1but the difference was not significant. However, low yield of 1.15 t ha-1 was obtained for 10th July sowing date. At Arek, 18th June,29th June and 10th July sowing dates achieved mean grain yield of 2.60, 2.48 and 2.58 t ha-1but were not statistically different. Variety Akuorachotout yielded other varieties with sites combined overall mean of 2.7 compared toDhet andBeerwith sites combined overall means of 2.36 and 2.18 t ha-1respectively. Significant positive correlationswere recorded between yield and leaf area index, plant height, harvest index and thousand seeds mass. Grain protein content of 11.55 % was achieved for 29th June sowing date in Bor and 11.40 % for 18th June sowing date in Arek. Varieties sown on 18th June had tannin content of 1.19 mgmL-1 while those sown on 10th July had tannin content of 1.49 mgmL-1. Tannin level was 1.37 mgmL-1in Bor but 1.24 mgmL-1 in Arek. Iron and zinc content was higher for 18th and 29thJunesowing dates compared to 10th July sowing. Beer and Dhet were high in protein; Dhet and Seredo were high in iron and zinc while Seredo and Akuorachot were high in tannin content. Inherent variety effect, location and choice of sowing date have associated effects on yield and grain quality of sorghum varieties. Therefore, when Dhet and Akuorachot varieties are sown in June sowing dates yield and grain quality are enhanced. en_US
dc.description.sponsorship Borlaug Higher Education for Agricultural Research and Development (BHEARD) and United States Agency for International Development (USAID en_US
dc.language.iso en en_US
dc.publisher Egerton en_US
dc.subject sowing date on days to flowering en_US
dc.subject yield and grain quality of sorghum (sorghum bicolor l. moench)in the Nile corridor region of south Sudan en_US
dc.title Effects of sowing date on days to flowering, yield and grain quality of sorghum (sorghum bicolor l. moench)in the Nile corridor region of south Sudan en_US
dc.type Thesis en_US


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