scholarly journals Population Management for Yield Improvement in Upland Rice Ecologies for West Africa Region

10.5772/30521 ◽  
2012 ◽  
Author(s):  
Andrew A.
Keyword(s):  
West Africa ◽  
Upland Rice ◽  
Population Management ◽  
Yield Improvement ◽  
Rice Ecologies

Cultivar and Weeding Effects on Weeds and Rice Yields in a Degraded Upland Environment of the Coastal Savanna

2011 ◽  
Vol 25 (3) ◽  
pp. 322-329 ◽  
Author(s):  
Amadou Touré ◽  
Jonne Rodenburg ◽  
Kazuki Saito ◽  
Sylvester Oikeh ◽  
Koichi Futakuchi ◽  
...  
Keyword(s):  
West Africa ◽  
Rice Yield ◽  
Upland Rice ◽  
Biomass Accumulation ◽  
Rice Cultivars ◽  
Weed Species ◽  
Weed Growth ◽  
Weed Suppressive Ability ◽  
Rice Yields ◽  
Growing Conditions

Weeds are a major constraint to rice production in labor-limited, upland rice-based systems in West Africa. The effects of weeding regimes and rice cultivars on weed growth and rice yield were investigated at two upland locations (Abomey-Calavi and Niaouli) in the degraded coastal savanna zone of Benin in 2005 and 2006 with below-average rainfall. Four weeding regimes (hoe weeding at 21 d after sowing [DAS], delayed hoe weeding at 31 DAS, hoe weeding at 21 and 42 DAS, and a no weeding control) were the main plot treatments. Cultivars comprising three interspecific upland rice cultivars (NERICA 1, NERICA 2, and NERICA 7) and the parents (Oryza sativaWAB56-104 andO. glaberrimaCG14) were tested in subplots. The most dominant weed species identified were Jamaican crabgrass,Mariscus, and silver spinach. Rice yield was generally low because of drought stress; none of the experiments had a higher mean yield than 1,400 kg ha−1across cultivars. Across cultivars, the best weeding regimes in terms of weed control and rice yields were single weeding at 31 DAS (W31) and double weeding at 21 and 42 DAS (W21+42). Under these weeding regimes, WAB56-104 out-yielded the three NERICA cultivars. CG14 showed the strongest weed suppressive ability (WSA) in Abomey-Calavi but did not have strong WSA in Niaouli because of lower biomass accumulation. WSA of WAB56-104 was similar to that of the three NERICA cultivars. Single weeding at 31 DAS, together with the use of cultivars with good adaptation to unfavorable rice growing conditions, would increase land and labor productivity of upland rice-based systems in West Africa.

Response of upland rice cultivars to weed competition in the savannas of West Africa

2009 ◽  
Vol 28 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Friday Ekeleme ◽  
Alpha Y. Kamara ◽  
Sylvester O. Oikeh ◽  
Lucky O. Omoigui ◽  
Paul Amaza ◽  
...  
Keyword(s):  
West Africa ◽  
Upland Rice ◽  
Weed Competition ◽  
Rice Cultivars

Fallow residue management effects on upland rice in three agroecological zones of West Africa

2000 ◽  
Vol 31 (6) ◽  
pp. 501-507 ◽  
Author(s):  
René Akanvou ◽  
M. Becker ◽  
Moussa Chano ◽  
David E. Johnson ◽  
Henri Gbaka-Tcheche ◽  
...  
Keyword(s):  
West Africa ◽  
Upland Rice ◽  
Residue Management ◽  
Agroecological Zones ◽  
Management Effects

Land, Power, And Dependency along the Gambia River, Late Eighteenth to Early Nineteenth Centuries

2014 ◽  
Vol 57 (3) ◽  
pp. 101-121 ◽  
Author(s):  
Assan Sarr
Keyword(s):  
West Africa ◽  
Upland Rice ◽  
Gain Control ◽  
Social Hierarchy ◽  
The Gambia ◽  
Rice Farming ◽  
Documentary Sources ◽  
Late Eighteenth ◽  
Oral Evidence

Abstract:The role of power over people and over land is an important issue in West Africa, with important implications for relationships between commoners and elites. Along with conquest, slave raiding, marriage, and procreation, control over land has enhanced the ability of chiefs and other elites to gain control over people, thus increasing their production and reinforcing social hierarchy and centralization of power. This article utilizes oral evidence and European documentary sources to examine the importance of the concept of “wealth-in-people” for understanding the significance of land in African societies. By focusing on the Gambia region, where both paddy and upland rice farming were practiced in the late eighteenth and early nineteenth centuries, the article contributes empirical observations to support the argument that control over both land and people played a central role in the accumulation of wealth in many African societies.

scholarly journals Rice Blast Prevalence in Smallholder Rice Farmlands in Uganda

2020 ◽  
Vol 12 (10) ◽  
pp. 105
Author(s):  
R. Amayo ◽  
Teddy Oparok ◽  
Jimmy Lamo ◽  
Silue Drissa ◽  
Richard Edema ◽  
...  
Keyword(s):  
Rice Blast ◽  
Upland Rice ◽  
Farming System ◽  
Blast Disease ◽  
Eastern Region ◽  
Smallholder Farming ◽  
Rice Yields ◽  
Rice Samples ◽  
Rice Ecologies

Rice blast disease remains the most important contributor to low and stagnated rice yields in Uganda. However, the role of the smallholder farming system in shaping the prevalence of the disease in the country is not known. In 2015B and 2016A, we surveyed smallholder rice farmlands in 27 districts of Uganda and recorded blast incidence, severity, and symptoms expression. Infected rice samples taken from the infected plants were sub-cultured on PDA media to confirm the pathogen and obtain isolates for the establishment of a core collection for breeding work. Rice blast prevalence in the districts varied from 50-100% and the national average stood at 72.61%, higher than that recorded five years ago. Mean incidence and severity varied significantly (< 0.001) with the highest incidence (96.8%) recorded in Luwero district and the least (21.3%) was recorded in the Amuru district. However, the eastern region recorded the highest average incidence (74.5%) followed by the central, the northern, and Mid-western regions. In the rice ecologies, the highest blast incidence was recorded in the rain-fed lowland rice (72.18%) followed by irrigated lowland (59.53%) and rain-fed upland rice (47.27%). This is the first report on the prevalence of blast in smallholder rice farmlands in Uganda and showed a higher prevalence of the disease.

Yield Improvement and Genotype × Environment Analyses of Peanut Cultivars in Multilocation Trials in West Africa

Crop Science ◽  
2014 ◽  
Vol 54 (6) ◽  
pp. 2413-2422 ◽  
Author(s):  
Stephen Narh ◽  
Kenneth J. Boote ◽  
Jesse B. Naab ◽  
Mumuni Abudulai ◽  
Zagre M’Bi Bertin ◽  
...  
Keyword(s):  
West Africa ◽  
Yield Improvement ◽  
Peanut Cultivars ◽  
Multilocation Trials
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