scholarly journals Responses of African yam bean (Sphenostylis stenocarpa [Hochst. Ex A. Rich]) accessions to viral diseases and serological identification of the associated viruses

2020 ◽  
Vol 37 (1) ◽  
pp. 85-93
Author(s):  
O.M. Ogunsanya ◽  
C.G. Afolabi ◽  
M.O. Otusanya ◽  
M.A. Adebisi
Keyword(s):  
Field Experiments ◽  
Natural Infection ◽  
Block Design ◽  
Viral Diseases ◽  
Sources Of Resistance ◽  
Pests And Diseases ◽  
African Yam Bean ◽  
Resistant Varieties ◽  
Cropping Seasons ◽  
Sphenostylis Stenocarpa

African yam bean (Sphenostylis stenocarpa) is an orphan crop with lofty nutraceutical benefits grown in Africa. However, pests and diseases often hinder its productivity. Twenty accessions of African yam bean (AYB) were screened for resistance to viral diseases and symptomatic leaves were indexed for the presence of viruses. The Field experiments were conducted during the 2015/2016 cropping seasons (wet and dry seasons). The twenty accessions were grown in triplicates in a randomized complete block design (RCBD) on the field under natural infection and the resistance or susceptibility responses were recorded using visual symptom expression. The characteristic symptoms that were highly prevalent were leaf mosaic and leaf distortion. In both seasons, there were significant (P< 0.05) differences in the severity of these viral symptoms. Also, based on the severity of the symptoms observed in this study, 2 accessions were classified as resistant, 16 as susceptible and 2 accessions as highly susceptible. Two viruses were identified serologically namely Cowpea Mild Mottle Virus (CPMMV) and Blackeye Cowpea Mosaic Virus (BlCMV). The sources of resistance identified in this study would be useful for breeders in developing virus resistant varieties for African yam bean improvement. Keywords: African yam bean, Virus, Symptoms, ACP-Elisa, Screening.

scholarly journals Comparison of Fish Pond Waste Water with Manures under Garden Egg in Nigeria

2016 ◽  
Vol 6 (3) ◽  
pp. 58 ◽  
Author(s):  
Dominic J. Udoh ◽  
Otobong B. Iren ◽  
Jeremiah E. Jonathan
Keyword(s):  
Waste Water ◽  
Field Experiments ◽  
Crop Yields ◽  
Block Design ◽  
Poultry Manure ◽  
Fish Pond ◽  
Pig Manure ◽  
Soil Conditions ◽  
Total N ◽  
Cropping Seasons

<p class="1Body">Two field experiments were conducted from 2012 to 2013 cropping seasons to evaluate the efficacy and also determine the optimum rates of application for fish pond waste water in comparison with three other manures including one inorganic fertilizer and two organic manures under garden egg (<em>Solanum spp.</em>) crop.Garden egg was fertilized with pond waste water (PW), poultry manure (PM), pig manure (PG) and NPK15:15:15 at equivalent nitrogen (N) rates (0, 150, 300, 450 kg/ha). The treatments were arranged in a split plot under randomized complete block design (RCBD).The results obtained indicated a slight drop in soil pH but soil OM, total N, available P, exchangeable Ca and K increased generally with increasing rates of manures. The PW and PG treatments supported significantly (P&lt;0.05) the highest yields of the crop compared to PM and NPK with the 150 and 300 kg/ha treatments recording the highest increase. These results have shown that under the high rainfall and acidic soil conditions of Akwa Ibom State in Nigeria, PW is useful for the improvement of soil conditions and achievement of higher crop yields when applied at rates that supply N in the range of 150 – 300 kg/ha.</p>

scholarly journals Weed infestation and productivity of maize/soybean intercrop as influenced by cropping patterns in the southern Guinea savanna of Nigeria

2018 ◽  
Vol 63 (1) ◽  
pp. 11-26
Author(s):  
Emmanuel Imoloame ◽  
Kafayat Ahmed
Keyword(s):  
Field Experiments ◽  
Block Design ◽  
Growth And Yield ◽  
State University ◽  
Economic Returns ◽  
Cropping Patterns ◽  
Guinea Savanna ◽  
Significant Difference ◽  
Weed Infestation ◽  
Cropping Seasons

Field experiments were conducted during the 2015 and 2016 cropping seasons at the Teaching and Research (T & R) Farm of the College of Agriculture, Kwara State University, Malete, to determine the effect of cropping patterns on weed infestation, growth and yield of a maize/soybean intercrop in the southern Guinea savanna of Nigeria. The experiments consisted of six treatments as follows: one row of maize alternated with one row of soybean (1:1), one row of maize alternated with two rows of soybean (1:2), two rows of maize alternated with one row of soybean (2:1), two rows of maize alternated with two rows of soybean (2:2), sole maize (1:0) and sole soybean (0:1). The treatments were laid out in a randomized complete block design with three replicates. Data collected were subjected to analysis of variance and means were separated by the least significant difference (LSD) at the 5% level of probability. Results showed that sole soybean consistently suppressed weeds and resulted in a higher yield. Similarly, the 2:1 ratio of maize to soybean did not only reduce weed density, it produced significantly higher yields of maize and lower yield of soybean, and had the higher land equivalent ratio and economic returns followed by sole maize.

scholarly journals Effects of Intra-Row Spacing of Sesame (Sesamum indicum L.) and Frequency of Weeding on Yields of Maize-Sesame Intercrop in Makurdi, Nigeria

2015 ◽  
Vol 38 ◽  
pp. 16-26
Author(s):  
Michael Ojore Ijoyah ◽  
J.A. Idoko ◽  
T. Iorlamen
Keyword(s):  
Field Experiments ◽  
Block Design ◽  
Sesamum Indicum ◽  
Factorial Experiment ◽  
Row Spacing ◽  
Competitive Pressure ◽  
Optimal Frequency ◽  
Land Equivalent Ratio ◽  
Randomized Complete Block Design ◽  
Cropping Seasons

Field experiments were conducted from July to October, during 2012 and 2013 cropping seasons, at the Research Farm, University of Agriculture, Makurdi, Nigeria, to evaluate the effects of intra-row spacing of sesame and frequency of weeding on yields of maize-sesame intercrop. The trial was a 3 x 3 factorial experiment fitted in a randomized complete block design with four replications. Nine of the treatments consisted of intercropped maize with sesame sown at the intra-row spacing of 10 cm, 15 cm and 20 cm, and at the varied weeding frequencies: maize-sesame intercrop sown on plots weeded once (1x) at 3 weeks after planting (WAP); maize-sesame intercrop sown on plots weeded twice (2x) at 3 and 6 WAP; maize-sesame intercrop sown on plots not weeded (NW). Sole sesame and sole maize respectively sown at their recommended intra-row spacing of 10 cm and 30 cm and at their recommended frequency of weeding (2x at 3 and 6 WAP) constituted the tenth and eleventh treatments, which also served as control plots. The results obtained showed that in a maize-sesame intercrop, increasing intra-row spacing of sesame up to 20 cm, on plots weeded 2x at 3 and 6 WAP, significantly (P≤0.05) produced the highest intercrop yields of maize and sesame. This level of treatment not only recorded the lowest competitive pressure, but gave the highest total intercrop yields, highest land equivalent coefficient values (1.01 and 1.13 respectively, in years 2012 and 2013), indicating the highest yield advantage, and highest land equivalent ratio (LER) values of 2.11 and 2.25 respectively recorded for years 2012 and 2013. With these LER values, 52.6 % and 55.6 % of land were respectively saved in years 2012 and 2013, which could be used for other agricultural purposes. The implication of study showed that, to maximize intercrop yields of maize and sesame in a maize-sesame intercrop, the appropriate intra-row spacing for sesame is 20 cm, while the optimal frequency of weeding is 2x at 3 and 6 WAP. This should therefore, be recommended for Makurdi location, Nigeria.

scholarly journals Improving the efficacy of Tithonia diversifolia extract in management of foliar diseases of sesame intercropped with maize under tropical conditions

2021 ◽  
Vol 54 (1) ◽  
pp. 165-173
Author(s):  
Muideen Jimoh ◽  
Ololade Adeduro Enikuomehin ◽  
Clement Gboyega Afolabi ◽  
Victor Idowu Olugbenga Olowe
Keyword(s):  
Leaf Extract ◽  
Field Experiments ◽  
Block Design ◽  
Foliar Spray ◽  
Tithonia Diversifolia ◽  
Cercospora Leaf Spot ◽  
Foliar Diseases ◽  
Tropical Conditions ◽  
Cropping Seasons ◽  
Spray Regimes

Abstract Cercospora leaf spot (CLS) and Alternaria leaf blight (ALB) diseases are major constraints to sesame production. Although disease management through intercropping of sesame with maize and foliar-spray with extracts of Tithonia diversifolia have been found to be effective, the frequency of application of the extracts required to achieve optimal disease control have not been determined. Therefore, a study was carried out to determine the effect of frequency of application of T. diversifolia extract on CLS and ALB diseases of sesame intercropped with maize during the early (June – September) and late (August – November) cropping seasons of 2011. Field experiments laid out in a Randomised Complete Block design and in a split plot arrangement with three replications were conducted in Ejigbo, Nigeria. Treatments consisted of aqueous Tithonia diversifolia leaf extract applied at 7.0, 7.5 or 8.0 % (w/v) in one-, two- or three- spray regimes at 2-week intervals from three weeks after planting (WAP) to plots of sesame intercropped with maize; Unsprayed sesame/maize intercrop; sesame/maize intercrop sprayed with Carbendazim (50 %)WP and unsprayed sole sesame plots. Results revealed that CLS and ALB incidence, severity and defoliation were significantly (p < 0.05) reduced by three-spray regime of 7.5 % (w/v) T. diversifolia extract. The efficacy of 7.5 % (w/v) T. diversifolia extract was comparable to that of 8.0 % (w/v) T. diversifolia extract or synthetic fungicide (Carbendazim 50 %WP). This study showed that the three-spray regime of 7.5 % w/v T. diversifolia leaf extract is sufficient to control foliar diseases of sesame intercropped with maize.

scholarly journals Water use, growth, and yield of drip irrigated cassava in a humid tropical environment

2011 ◽  
Vol 6 (No. 1) ◽  
pp. 10-20 ◽  
Author(s):  
O.O. Odubanjo ◽  
A.A. Olufayo ◽  
P.G. Oguntunde
Keyword(s):  
Water Use ◽  
Dry Matter ◽  
Field Experiments ◽  
Block Design ◽  
Growth And Yield ◽  
Control Treatment ◽  
Total Water ◽  
Agricultural Engineering ◽  
University Of Technology ◽  
Cropping Seasons

Field experiments were conducted at the Agricultural Engineering Experimental Farm of The Federal University of Technology, Akure, during 2006/2007 and 2007/2008 seasons to investigate the response of cassava under drip irrigation. The experiment was laid out in a randomised complete block design (RCBD) with three replications. The treatments were based on four different water regimes; with T100 receiving 100% available water (AW), T<sub>50</sub> and T<sub>25</sub> receiving 50% and 25% of AW and T<sub>0</sub> with zero irrigation (control treatment). Disease free stems of the cassava cultivar TMS 91934 were planted at a spacing of 1 m by 1 m. The results indicated that T<sub>100</sub> full treatment produced the highest average total dry matter yield of 49.12 and 37.62 t/ha in 2006/07 and 2007/08 cropping seasons, respectively. However, the average total dry matter production in T<sub>50</sub>, T<sub>25</sub>, and T<sub>0</sub> showed significant differences in their values. Low total dry matter yields of 7.12 and 5.92 t/ha, respectively, were associated with T<sub>0</sub> for the two cropping seasons. The total water use of 1491.75 and 1701.13 mm was recorded for T<sub>100</sub>, while total water use of 729.00 and 651.13 mm were obtained for T<sub>0</sub> in the two cropping seasons. The water use efficiency determined for the two cropping seasons ranged between 7.38 kg/ha and 32.93 kg/ha. The percentages of total water applied from total water use for T<sub>100</sub> were 51.11% and 61.72%, while 14.83% and 17.85% were recorded for T<sub>25 </sub>for 2006/07 and 2007/08 cropping seasons, respectively.

scholarly journals Identification of sources of resistance in sorghum to Peronosclerospora sorghi

2005 ◽  
Vol 30 (5) ◽  
pp. 522-524 ◽  
Author(s):  
Flavia C. R Barbosa ◽  
Carlos R Casela ◽  
Ludwig H Pfenning ◽  
Fredolino G Santos
Keyword(s):  
Experimental Design ◽  
Natural Infection ◽  
Block Design ◽  
Systemic Infection ◽  
Sources Of Resistance ◽  
Single Row ◽  
Susceptible Line ◽  
Peronosclerospora Sorghi ◽  
Randomized Block Design ◽  
Sorghum Genotypes

The main objective of this work was to identify sources of resistance in sorghum (Sorghum bicolor) to Peronosclerospora sorghi, the causal agent of downy mildew, through the evaluation of 42 sorghum genotypes under natural infection in the field. Genotypes were planted in single row plots between two rows of the susceptible line SC283, planted 30 days before, to act as spreader rows, in two separate nurseries. The experimental design was a completely randomized block design with three replications. Sorghum genotypes CMSXS156, CMSXS157, CMSXS243, TxARG-1, 8902, 9902054, 9910032, 9910296, Tx430, QL-3, SC170-6-17, CMSXS762 and BR304 were classified as highly resistant in both nurseries. Among these, SC170-6-17 and 9910296 showed 0% systemic infection. Results indicated the possible occurrence of different pathotypes of P. sorghi in the two nurseries.

Agronomic Evaluation of Performance of Sesame Varieties in Maize-based Intercropping System in the Southern Guinean Savanna of Nigeria

2019 ◽  
pp. 1-10
Author(s):  
A. T. Ajibola ◽  
G. O. Kolawole
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Block Design ◽  
Yield Reduction ◽  
K Value ◽  
Land Equivalent Ratio ◽  
Sesame Seeds ◽  
Evaluation Of Performance ◽  
Percentage Yield ◽  
Cropping Seasons

Aims: Field experiments were conducted to determine compatibility of sesame varieties for intercropping with maize. Study Design: The experiment was a randomized complete block design with three replications. Place and Duration of Study: Teaching and Research Farm, LAUTECH, Ogbomoso, southern guinea savanna area of Nigeria during the 2010 and 2011 cropping seasons. Methodology: The treatments included Sole maize (Oba Super 1 variety), five sole sesame varieties (E-8, O3l, O1m, O2 m, Exotic-Sudan) and their intercrops, making a total of eleven treatments.  Sole maize was planted at a spacing of 75 cm x 25 cm. For intercrops, maize was planted at a spacing of 100 cm x 25  cm and sesame seeds were planted at a spacing of 100 cm x 10 cm such that sesame row alternated maize row. Maize was planted first and sesame was introduced two weeks after. Results: Intercropping maize with sesame varieties significantly (P = 0.05) reduced number of pods and grain yield of sesame varieties in both years. However, variety O2m produced grain yield in the intercrop similar to the mono crop. Generally, Intercropping sesame with maize significantly reduced the grain yield of maize by 36% compared to the sole crop. Exotic-Sudan varieties caused the highest percentage yield reduction (52%). Sesame varieties O2m and O3l were the only varieties whose yield advantage in intercropping with maize had land equivalent ratio (LER) of 1.28 and 1.18 while other varieties had values less than 1 indicating yield advantage of O2m and O3l with maize. The relative crowding coefficient (K) value of maize (4.98) was higher than sesame (0.44) thus indicating its dominance in the mixture. Conclusion: It is concluded that the prospective sesame farmers could grow varieties O2m and O3l in place of the popular E-8 because intercropping with maize did not affect their performances in both years.

RATOONED LOWLAND NERICA RICE VARIETIES AS AN OPTION FOR TRIPLE CROPPING IN INLAND VALLEYS OF DERIVED SAVANNAH IN NIGERIA

2012 ◽  
Vol 48 (4) ◽  
pp. 551-562 ◽  
Author(s):  
S. O. ADIGBO ◽  
M. O. OLOJEDE ◽  
P. J. C. HARRIS ◽  
O. AJAYI
Keyword(s):  
Grain Yield ◽  
Field Experiments ◽  
Block Design ◽  
Appropriate Technology ◽  
Lowland Rice ◽  
Rice Crop ◽  
Rice Varieties ◽  
Fluted Pumpkin ◽  
Inland Valley ◽  
Cropping Seasons

SUMMARYAlthough triple cropping in inland valleys of Nigeria is technically feasible, the third crop between the main crop and dry season non-rice crop has been considered not to be economically viable because of poor crop establishment due to soil inundation. The identification of an appropriate technology with low input, such as ratooning, would allow this niche to be utilized. Field experiments were conducted at the University of Agriculture, Abeokuta, Nigeria in 2007–2008 and 2008–2009 cropping seasons to evaluate the performance of the main and ratooned crops of lowland NERICA (New Rice for Africa) rice (Oryza sativa L.) varieties in a lowland rice–ratooned rice–fluted pumpkin (Telfairia occidentalis Hook F.) sequence. The experiment was laid out in a randomized complete block design with three replicates. The lowland rice varieties used were NERICA-L 19, NERICA-L 20, NERICA-L 22, NERICA-L 24, OFADA, NERICA-L 26, NERICA-L 41, NERICA-L 42, NERICA-L 44 and NERICA-L 47. The grain yield of the main rice crop ranged from 5.0 to 7.3 t ha−1 in 2007–2008 cropping season and from 4.1 to 9.1 t ha−1 in 2008–2009. The ratooned rice had a grain yield of 1.0–4.7 t ha−1 in 2007–2008 and 1.2–3.4 t ha−1 in 2008–2009. The total grain yield obtained in 2007–2008 from the main and ratooned rice crops in seven months was 6.7–11.6 t ha−1, while in 2008–2009 it was 5.3–2.6 t ha−1. The fresh leaf yield of fluted pumpkin ranged from 14.6 to 16.9 t ha−1 in 2007–2008 and from 18.3 to 19.8 t ha−1 in 2008–2009, similar to previously reported rainy season unfertilized yields. Thus, a ratooned rice crop appears to be a feasible technology capable of boosting rice production and consequently increasing the overall productivity of the inland valley in a rice–rice–vegetable cropping sequence.

scholarly journals Ketahanan Galur Isogenik IRBBN dan Galur Harapan Padi terhadap Patotipe Xanthomonas oryzae pv. oryzae Dominan pada Tanaman Padi di Indonesia

2018 ◽  
Vol 23 (1) ◽  
pp. 23
Author(s):  
Dini Yuliani ◽  
Untung Susanto ◽  
Sudir Sudir
Keyword(s):  
Block Design ◽  
International Rice Research Institute ◽  
Xanthomonas Oryzae ◽  
Near Isogenic Lines ◽  
Field Station ◽  
Isogenic Lines ◽  
Resistant Varieties ◽  
Dry Seasons ◽  
Cropping Seasons ◽  
Research Institute

<p><strong>Abstract</strong></p><p>The resistance genes in IRBB near isogenic lines (NILs) which was introduced from International Rice Research Institute (IRRI) have been known. It could be used as source of resistance to the dominant Xanthomonas oryzae pv. oryzae (Xoo) pathotype in Indonesia. The purpose of this research was to evaluate IRBBN NILs and promising lines to the dominant Xoo pathotype in Indonesia i.e. pathotype III, IV, and VIII. Research was conducted at Sukamandi exprerimental field station in Subang, West Java, at dry seasons (DS) 2012 and wet seasons (WS) 2012/2013. The experiment was conducted following Factorial Randomized Completely Block Design with three replications. The first factor were three pathotype Xoo that was pathotype III, IV, and VIII, while the second factor were 20 IRBB lines, 6 promising lines, and 6 refferer varieties such as Conde, Lusi, Logawa, Java 14, Angke, dan Inpari 1. The result showed that three isogenic lines i.e. IRBB 21, IRBB 50, and IRBB 52 were resistant to Xoo pathotype III, IV, and VIII at DS 2012. At WS 2012/2013 was obtained five isogenic lines i.e. IRBB 52, IRBB 53, IRBB 54, IRBB 56, and IRBB 57 resistant to Xoo pathotype III, IV, and VIII. IRBB 52 was consistently resistant to the three Xoo pathotypes in two cropping seasons. It could be recommended to be used as donor in developing new resistant varieties to bacterial leaf blight.</p><p> </p><p><strong>Abstrak</strong></p><p>Galur isogenik IRBB introduksi dari International Rice Research Institute (IRRI) telah diketahui gen ketahanannya dan dapat digunakan sebagai sumber ketahanan terhadap patotipe Xanthomonas oryzae pv. oryzae (Xoo) dominan di Indonesia. Kegiatan penelitian ini bertujuan untuk mengevaluasi ketahanan galur isogenik dan galur harapan terhadap patotipe Xoo dominan di Indonesia, yaitu patotipe III, IV, dan VIII. Penelitian dilaksanakan di Kebun Percobaan Sukamandi, Subang, Jawa Barat pada musim kemarau (MK) 2012 dan musim hujan (MH) 2012/2013. Penelitian dilakukan dengan Rancangan Faktorial Acak Kelompok dengan tiga ulangan. Faktor pertama adalah tiga patotipe Xoo, yaitu patotipe III, IV, dan VIII, sedangkan faktor kedua yaitu materi yang diuji sebanyak 20 galur IRBB, 6 galur harapan padi, dan 6 varietas pembanding, yaitu Conde, Lusi, Logawa, Java 14, Angke, dan Inpari 1. Hasil penelitian menunjukkan bahwa galur isogenik IRBB 21, IRBB 50, dan IRBB 52 bereaksi tahan terhadap Xoo patotipe III, IV, dan VIII pada MK 2012. Pada MH 2012/2013 diperoleh lima galur isogenik IRBB 52, IRBB 53, IRBB 54, IRBB 56, dan IRBB 57 bereaksi tahan terhadap Xoo patotipe III, IV, dan VIII. Galur isogenik IRBB 52 konsisten tahan terhadap Xoo patotipe III, IV, dan VIII pada dua musim tanam. Oleh karena itu, galur tersebut dapat direkomendasikan untuk dijadikan tetua tahan untuk perakitan varietas tahan HDB.</p>

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