Friday Ekeleme

Michael Okpara University of Agriculture

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David Chikoye

Golden Valley Agricultural Research Trust

Alpha Y. Kamara

International Institute of Tropical Agriculture

Lucky O. Omoigui

University of Agriculture

I. O. Akobundu

Windsor Dermatology

I. Y. Dugje

University of Maiduguri

Stefan Hauser

University of Wisconsin–Milwaukee

A. Y. Kamara

International Institute of Tropical Agriculture

Abebe Menkir

International Institute of Tropical Agriculture

A. O. Isichei

Obafemi Awolowo University

A. Fontem Lum

University of Buea

Cooperative Institutions

International Institute of Tropical Agriculture

Michael Okpara University of Agriculture

Federal University of Agriculture

University of Agriculture

Ahmadu Bello University

Cornell University

Bayero University Kano

Africa Rice Center

International Institute of Tropical Agriculture

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Growth Characteristics of TenMucunaAccessions and their Effects on the Dry Matter ofImperata cylindrica(L.) Rauesch

Biological Agriculture & Horticulture (2001)

David Chikoye Friday Ekeleme

ABSTRACT Imperata cylindrica (L.) Rauesch. is one of the most common and difficult weeds to control in many crops grown in West Africa. Studies were conducted from 1997 to 1999 in the forest/savannah transition zone to identify growth characteristics that enhance the competitive ability of Mucuna accessions against I. cylindrica. Significant interactions between accession and year were found for all growth characteristics and I. cylindrica dry matter (DM). Seedling density, leaf area index (LAI), percentage ground cover, and DM of Mucuna differed with accession and year (p < 0.05). Accession and year (p < 0.05) also affected I. cylindrica DM. After 3 years, reduction in the DM of I. cylindrica ranged from 58 to 89%, relative to the amount present at the beginning of the study. All growth characteristics of Mucuna were negatively correlated with I. cylindrica DM (r = −0.63 to −0.86, p < 0.05), with LAI being the most important. M. cochinchinensis, M. jaspeada, and M. Veracruz (mottled and white seeded) reduced the DM of I. cylindrica most while M. preta and M. rajada were the least effective.

Imperata

Mucuna

10.1080/01448765.2001.9754883

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Citations (16)

Evaluation of cowpea genotypes for their reactions to Striga gesnerioides in the dry savanna of northeast Nigeria.

8th African Crop Science Society Conference, El-Minia, Egypt, 27-31 October 2007. (2007)

Lucky O. Omoigui A. Y. Kamara F. S. Massawe M.F. Ishiyaku Ousmane Boukar

Dry season

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Nitrogen fertilisation and cultivar effects on the performance of early and late maturing maize under natural infestation with Striga.

A. Y. Kamara Friday Ekeleme Lucky O. Omoigui Abebe Menkir David Chikoye

Fertilisation

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Simulating planting date and cultivar effects on dryland maize production using CERES-maize model

African Journal of Agricultural Research (2012)

J.M. Jibrin Alpha Y. Kamara Friday Ekeleme

Maize farmers and extension agents in dry sudan savanna need information on how planting date and the choice of variety affect grain yield. This study was conducted to test the ability of model to predict maize yields under varying planting dates. Data on two open-pollinated maize cultivars (TSB-SR and TZE-COMP4) sown on different dates (June 29th, July 13th, July 21st and July 28th) in 2006 and 2007 at Azir (11° 01.820´ N, 12°37.714´ E; 441 m) and Damboa (11° 10.379´; 12° 47.145´E; 396 m) in the Sudan Savanna of Nigeria were used in running the model. Experimental data from Azir in 2006 was used to calibrate the model, while the data for 2007 at Azir 2006 and 2007 at Damboa were used for model validation. The model predicted days to anthesis at Damboa as reasonably well in both 2006 and 2007 (d-index >0.8), while at Azir, the prediction of days to anthesis was very poor in 2007. The match between predicted and observed grain yield were very good in 2007 at both locations. The root mean square error (RMSE) values for grain yield in 2007 were 431.5 and 226.5 kg ha-1 at Azir, and 799.5 and 611.5 kg ha-1 at Damboa for TZB SR and TZE COMP4, respectively, while the d-index values were all greater than 0.94. Generally, the model predicted decrease in grain yield with delay in planting date except for TZB-SR at Azir in 2006 where planting on July 13th gave higher yield than planting on June 29th. The grain yield values from the simulations suggested late June to early July as the optimum planting window for both varieties at both Azir and Damboa. Key words: CERES-maize, planting date, Sudan savanna.

Anthesis

10.5897/ajar12.1303

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Citations (23)

Planting Date and Cultivar Effects on Grain Yield in Dryland Corn Production

Agronomy Journal (2009)

Alpha Y. Kamara Friday Ekeleme David Chikoye Lucky O. Omoigui

Corn ( Zea mays L.) production is gradually spreading into the Sudan savanna zone of West Africa where production is limited by erratic and inadequate rainfall. To increase corn production, production practices should be properly designed to minimize the effects of low precipitation and high temperatures that characterize the zone. A study, to determine the performance of late (120 d), early (90 d), and extra‐early maturing (80 d) corn cultivars over a range of planting dates, was performed in the Sudan savannas of northeast Nigeria. Delaying planting generally increased days to flowering and the anthesis‐silking interval (ASI) and reduced dry matter production and yield and yield components. In Azir, planting of corn on 13 July reduced grain yield by 42% in 2006 because of a dry spell during crop establishment. Delaying planting to 21 and 28 July also reduced grain yield by 19 and 28.5%, respectively over the 2 yr. Averaged over the 2‐yr yield reduction was 29.5 and 42% when corn was planted on 21 and 28 July, respectively in Damboa. There was no interaction between planting date and corn cultivar for days to silking, ASI, and grain yield suggesting that the cultivars responded similarly to planting date. The extra‐early maturing cultivar, 95 TZEE‐W, produced highest dry matter, harvest index, and grain yield at all planting dates suggesting that this cultivar is the most suitable in both locations. To reduce risk of drought stress, extra‐early maturing corn cultivars should be planted in the Sudan savanna between the last week of June and the first week of July.

Anthesis

10.2134/agronj2008.0090

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Citations (72)

Legume–maize rotation and nitrogen effects on weed performance in the humid and subhumid tropics of West Africa

Crop Protection (2007)

David Chikoye Friday Ekeleme A. Fontem Lum Steffen Schulz

Stylosanthes

Dry season

10.1016/j.cropro.2007.09.007

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Citations (8)

Relation of yields of soybean and maize to sulphur, zinc, and copper status of soils under intensifying cropping systems in the tropical savannas of north-east Nigeria

Journal of Food Agriculture & Environment (2009)

J. D. Kwari Alpha Y. Kamara Friday Ekeleme Lucky O. Omoigui

Deficiencies of sulphur (S), copper (Cu) and zinc (Zn) are becoming prevalent under intensifying agricultural systems in north-eastern Nigeria. They are manifest in the partial or lack of response by crops to NPK fertilizers leading to a reduction in crop quality and yields. Data were collected on the initial available S, Cu and Zn contents of some samples from 0-15 cm depth from farmers’ compound fields (64) and bush fields (73) in 30 communities across three agro-ecological zones in north-east Nigeria. These were related to the grain yields of soybean and maize varieties from demonstration trials to assess if they are yield determinants of these crops. Available S content (range 5.10-18.49 mg kg -1 ) was moderate to medium status in over 80% of the fields within the region. This content significantly influenced yields of soybean (P = 0.0245) and maize (P = 0.0415) in bush fields in the Southern Guinea savanna (SGS) and maize (P = 0.0074) in compound fields in Sudan savanna (SS), thus indicating S was a determinant of the performance of these crops. Nearly all fields were deficient in Zn with a range of 0.002-1.47 mg kg -1 . This had a significant effect on maize yields in compound fields (P = 0.0376) in SGS and in bush fields (P = 0.0090) in SS. Also available Cu content was deficient (range 0.001-0.274 mg kg -1 ) in over 83% of the soils and had a significant effect on soybean yields in compound fields (P = 0.0455) in SGS. The soils in north-east Nigeria were moderate in S but deficient in Cu and Zn and may require the application of NPK fertilizer containing these micronutrients for the cultivation of maize and soybean.

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Effect of phosphorus application and soybean cultivar on grain and dry matter yield of subsequent maize in the tropical savannas of north-eastern Nigeria

AY Kamara J. D. Kwari Friday Ekeleme Lucky O. Omoigui Robert C. Abaidoo

Soybean can contribute to soil N, which may partly be used to improve maize production in northeast Nigeria. However, the efficiency of soybean to fix N can be limited by soil P deficiency. This study evaluated the effect of P application and soybean cultivars on dry matter and grain yield of subsequent maize for two years (2005 - 2006) at Miringa and Azir. Experimental design was a split-plot with three replications. The main plots contained P levels of 0, 20 and 40 kg P/ha and subplots had four soybean cultivars. Maize was planted in the harvested soybean plots. Application of P to soybean at 20 and 40 kg/ha significantly increased dry matter and grain yield of succeeding maize. Differences in grain yield were significant between all P rates in Miringa (2005) and Azir (2006) but only between 0 and 40 kg P/ha in Azir (2005) and Miringa (2006). The grain yields of maize following late-maturing soybean cultivars were significantly higher than those following the early maturing cultivars in 2005. The maize yield increases could however, not be explained by total soil N, available P, and N and P uptake. Other rotation effects beyond N supply by the preceding soybean may be responsible for the yield increases of maize.

10.4314/ajb.v7i15.59099

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Citations (21)

The effect of communication media on the uptake of agricultural innovations in selected states of Nigeria

The Journal of Agricultural Education and Extension (2022)

Godwin Atser A. G. O. Dixon Friday Ekeleme Stefan Hauser Olushola Fadairo

Purpose Poor uptake of agricultural innovations on weed management practices is a major factor responsible for low productivity. This paper examines how communication media can help improve farmers' adoption behaviour.Methodology A sample of 725 Nigerian cassava farmers, exposed to agricultural innovation on weed management practices from varying sources, were asked, through a structured questionnaire, to indicate their knowledge, attitudes, and practices of cassava weed management. The responses were compared with a sample of 190 cassava farmers who were not exposed to the information (control group). The data were analysed using frequency counts, percentages, mean, analysis of variance, and multivariate probit regression.Findings Farmers exposed to the agricultural innovation in weed management practices indicated more positive behaviour (57.7%) towards improved weed management practices than the control group (26.8%). The mean knowledge, attitude, practice, and behaviour of the farmers exposed to the innovation through demonstration was significantly higher than for other sources.Practical implications On-farm demonstrations as a means of communication will enhance the uptake and effectiveness of agricultural innovation on weed management practices.Theoretical implications Findings on the influence of communication media on improved weed control and agronomy are significant, given that there is little well-documented data on how communication media enhances technology and innovation adoption in arable crop farming.Originality/value This study generates important data that reinforces the imperatives of communication and media choices, and further underpins the debate that technology alone cannot lead to uptake by farmers but needs to be communicated.

Multivariate probit model

Arable land

Sample (material)

10.1080/1389224x.2022.2120026

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Citations (4)

Changes in a secondary forest in southwestern Nigeria following a ground fire

Journal of Tropical Ecology (1986)

A. O. Isichei Friday Ekeleme Bakare A. Jimoh

ABSTRACT In January 1983, two 50 m × 50 m rain forest plots in the University of Ife campus in southwestern Nigeria were demarcated for a baseline study of species composition, litterfall and tree girth increments. By accident, a severe ground fire burnt one of the plots on 31 January, barely two weeks after litter traps had been set and species listing and first girth measurements completed. The effect of this fire was assessed in the burnt plot after 14 months, in April 1984. The fire affected small trees especially, and there were indications that some species were more sensitive than others. Manihot glaziovii , which was present in the plot and abundant in its vicinity before the fire showed a big increase in density after the fire because it was able to germinate in the openings created by the fire. These observations were related to succession, and it is concluded that the observation by some workers that the initial composition of a regrowth forest may be partly predicted from a knowledge of the seed bank in the soil may be applicable in the present case.

Litter

Secondary forest

10.1017/s0266467400000870

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Citations (18)