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Accueil du site → Doctorat → Ethiopie → Improving Sorghum [Sorghum bicolor L. Moench] Productivity through Seed Priming, Soil Moisture Conservation, and Nutrient Management in Semi-arid Areas of Eastern Ethiopia

Haramaya University (2017)

Improving Sorghum [Sorghum bicolor L. Moench] Productivity through Seed Priming, Soil Moisture Conservation, and Nutrient Management in Semi-arid Areas of Eastern Ethiopia

Teshome Getaneh Wondimu

Titre : Improving Sorghum [Sorghum bicolor L. Moench] Productivity through Seed Priming, Soil Moisture Conservation, and Nutrient Management in Semi-arid Areas of Eastern Ethiopia

Auteur : Teshome Getaneh Wondimu

Université de soutenance : Haramaya University

Grade : Doctor of Philosophy (PhD) in Agronomy 2017

Résumé partiel
Sorghum [Sorghum bicolor (L.) Moench] is an important food crop cultivated in arid and semi-arid regions of Ethiopia in general and East Hararghe Zone in particular. However, the productivity of the crop is low due to limited and erratic rainfall, low soil fertility, and traditional farming practice. Therefore, effects of seed priming, and combined application of in-situ moisture conservation and nutrient management on sorghum productivity were investigated during 2014 cropping season in semi-arid areas of East Hararghe. Seed priming experiments were carried out under lab and field to evaluate the effects of priming on germination and seedling vigor, stand establishment, growth and yield of sorghum. The treatments for lab experiment consisted of three priming media [distilled water, Zn (0.2 g L-1 ZnSO4) and N (9 g L-1 urea)], five priming durations (0, 5, 10, 15, and 20 h), and six sorghum varieties (Abshir, Dekeba, Macia, Meko-1, Melkam, and Teshale). The results showed Zn primed seeds followed by N for 10 h priming duration recorded the highest improvements in germination percentage (6%), germination-index (8.4%), mean germination time (MGT) (4%), seedling-length (SL) (12.5%), seedling-dry-weight (SDW) (26.5%), seedling-vigor-index-1 (SVI-1) (33%) and seedling-vigor-index-2 (SVI-2) (49.7%) as compared to unprimed seeds. Likewise, variety Melkam with 10 h priming recorded the highest values of MGT, FGP, GI, SL, SDW, SVI-1, and SVI-2 that were higher by 7, 7.7, 4, 13.6, 30, 38, and 59% of unprimed seeds, respectively. Among the varieties studied, the three best performed varieties Dekeba, Melkam, and Teshale were used for farther assessment of seed priming media effects on stand establishment, growth, and yield of sorghum at Babile and Errer. The experiment was laid in randomized complete block design with tree replication of treatments consisted of three varieties (Dekeba, Melkam, and Teshale) and three priming media (water, Zn, N) and unprimed control. The results revealed that stand counts were significantly (P < 0.01) affected only by priming media, although the differences among priming media were non-significant. As compared to unprimed seeds, hydropriming had increased the plant stand by 10% and 16% at the period of establishment and maturity, respectively. The main effects of location, variety, and priming media significantly influenced the mean flowering and maturity time of sorghum.

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