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Tytuł:
Earthworm species as pointer for herbaceous flora distribution and health of soil in Onigambari Forest Reserve, Oyo state Nigeria
Autorzy:
Onafurume, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1076651.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Earthworms
Floristic composition
Natural forest
Relative importance value
Soil fertility
Opis:
Amongst various and diverse organisms, earthworms (Annelida: Oligochaeta) are the most important components of soil biota when it comes to soil formation and maintenance of soil structure and fertility. The presence of earthworms modifies the soil quality of the environment due to their burrowing and casting. This affects the activities of other organisms. Thus, they are also termed “ecosystem engineers”. However, while we begin to understand the role of surface casts, it is still unclear to what extent plants utilize subsurface casts. This work is a study of the floral community structure as influenced by surface cast so as to determine the functional groups of earthworms in the natural forest zone of Onigambari Forest Reserve. This reserve is located at latitude 07°25’N and longitude 3°53’E within the low and semi-deciduous forest belt of Nigeria. It is divided into two: natural and plantation forests. Herein, the simple random sampling technique was used to select 10 geo-referenced plots (15m × 15m each). Three 1.0m × 1.0m square quadrats were randomly laid on each plot to give 30 sampling points surveyed for data collection. Data were collected on floral composition, relative importance values (RIV), earthworm composition and diversity, and physicochemical components of the soil. Twenty eight herbaceous plants were enumerated. Andropogon gayanus had the highest relative importance value (RIV) of (20.499), while Acroceras zizanoides and Platostoma africanum had the least RIV (1.1782) amongst other four. Seven earthworm species were enumerated, with Eisenia fetida having the highest RIV (28.571), while Octoclasion cyaneam and Lumbricum rubellus had the least. The species richness of earthworms was high (0.8061) and evenly distributed (0.8405), but with a low diversity (H’ = 1.772). There are two functional groups of earthworm in the natural forest zone, seven were surface dwelling, while only Lumbricus terrestris was sub-surface dwelling. The health of flora and soil of the natural forest zone of Onigambari forest reserve is low. Prevention of outside influence on the forest zone, seeding and deposition of organic waste matter to the soil are strategies that would enhance abundance and diversity of earthworms in the natural forest zone.
Źródło:
World News of Natural Sciences; 2019, 26; 80-95
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bio-insecticidal activity of Delonix regia oil extracts on maize weevil Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae)
Autorzy:
Obembe, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1178504.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bio-insecticide
Delonix regia
Lethal
Mortality
Sitophilus zeamais
Opis:
The maize weevil, Sitophilus zeamais (Coleoptera: Curculionidae) is one of the major pest infesting stored grains world wide. Experiments were conducted to study the efficacies of D. regia oils on mortality and adult emergence of S. zeamais Motschulsky. The long time storage and viability of the treated maize grains were also investigated. Results obtained showed that D. regia oil at every concentration was lethal on S. zeamais. At 1.0%, 1.5%, and 2.0% concentration, there was 100% mortality of S. zeamais at 96 h of exposure. The least potent extract was 0.5% concentration. The extracts drastically reduced adult emergence to 0.0% in grains treated with 1.5% and 2.0% oil extracts concentration. Grains treated with 1.0%, 1.5% and 2.0% D. regia seed oil completely prevented infestation and subsequence damage of the treated maize grains for a period of three Months. Thereafter, 20.04% damage was observed in grains treated with 0.5% oil extract. The oil extracts at all concentrations in this experiment hardly affected germination as there was no significant difference between percentage germination in the treated grains and the control. The results obtained reveal that oil extracts of D, regia seeds are effective in controlling S. zeamais and could serve as alternative to the controversial convectional chemical insecticides
Źródło:
World Scientific News; 2017, 70, 2; 86-96
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical Study of Selected Medicinal plant, Solanum Nigrum, the Algerian Desert
Autorzy:
Djaafar, Z.
Ridha, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/412362.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Medicinal plants
Solamun Nigrum
Phytochemical analysis
Opis:
Solanum Nigrum plant contains many compounds of High utility, such as: alkaloids, saponin, and others. Through this study in the field of plant chemistry that we can know all the components of the various parts (leaves, twigs, flowers, fruits and roots) of the plant Solanum Nigrum, and enhance the classification of the operations during the disclosure of the components of the plant and contents of secondary metabolism and some of which adopted the newly particularly alkaloids and terpenes as genetic indicators.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 1; 25-30
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endangered indigenous cattle breeds of Nigeria a case for their conservation and management
Autorzy:
Gwaza, D. S.
Momoh, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1192705.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cattle-breed
Conservation
endangered
genetic-diversity
Opis:
The Nigeria cattle breeds and their productivity were reviewed. A case was made for their conservation and management, an action plan was also proposed for the Nigerian government. The indigenous cattle breeds of Nigeria have short calving interval, are hardy and trypanotolerant, known for early maturity with low mortality rate for total herd (2% and 4.7% for Muturu and Keteku respectively). The Kuri has high potentials for milk production and can calve up to twelve times in life time. They also have enormous contribution to source of income to many cattle rearers in Nigeria. The indigenous cattle breeds of Nigeria are endangered. The Muturu, N’dama and Keteku are endangered due to extensive uncontrolled crossbreeding with exotic breeds. There is also waning interest among farmers in the use of intact indigenous breeds. The Kuri and Biu cattle breeds are endangered due primarily to environment factors. The civil war also had a significant effect on the elimination of some indigenous cattle breeds especially the forest breeds. The endangered indigenous cattle breed can be conserved by the In-situ techniques. The cost of maintenance of the insitu preservation is often high, but it is to be preferred because it is less technically involving and can be well manage given adequate technologies and funds. The inbreeding effect and maintenance of natural habitat can be reduce by use of appropriate mating system and preservation of the original environment. The live conservation techniques can be organise into park with wild life for revenue generation. Rural farming communities can also be organize to form National indigenous cattle breed ownership Scheme (NICABROS), as a community based conservation management technology are action plans that are propose for insitu conservation of Nigerian endangered cattle breeds.
Źródło:
World Scientific News; 2016, 30; 68-88
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of the antioxidant activity and phytochemical composition of leaves extract between three varieties of date palm tree
Autorzy:
Eddine, L. S.
Ladjel, S.
Mohamed, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/412430.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Phoenyx dactylifera
polyphenol
DPPH radical-scavenging activity
reducing power
antimicrobial
south Algeria
Opis:
The date palm (Phoenyx dactylifera) consisted, for the people of southern Algeria, as tree of providence. Dates and their extracts are also used for many centuries as a medicine against allergy, inflammation, constipation and gastro-protective; they also have a high antibacterial and antioxidant activity. However, no studies are conducted to evaluate the extract from the leaves of date palm (Phoenyx dactylifera) in point of view of phytochemical composition, antimicrobial and the antioxidant activity. In this study, we have determined the phenolic compounds, antioxidant and antimicrobial activity of methanolic extracts from three varieties of leaves tree. According to the results the leaves extracts have very important values for polyphenols (215.24 to 156.46 mg GAE / g DW) and high antioxidant activity (324. 45 to 206.21 mg GAE / g DW), Diphenyl-1 picrylhydrazyl radical-scavenging activity (IC50 = 2.98 to 4.83 μg / ml); also the three extracts reveal a considerable antimicrobial potency and antifungal considerable activity, the diameter of inhibition is 35.2 to 39.5 mm (concentration 50 mg/ml) for Candida albicans ATCC 90026.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 9, 2; 162-171
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further Study on Thermal Performance of Porous Fin with Temperature-Dependent Thermal Conductivity and Internal Heat Generation using Galerkin’s method of Weighted Residual
Autorzy:
Sobamowo, M. G.
Kamiyo, O. M.
Adeleye, O. A.
Powiązania:
https://bibliotekanauki.pl/articles/1046542.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Galerkin’s method of weighted residual
Porous Fin
Surface convective heat transfer
Temperature-Dependent Thermal Conductivity and Internal Heat Generation
Thermal performance
Opis:
This work is presented as a further study to our previous work, “Thermal performance analysis of a natural convection porous fin with temperature-dependent thermal conductivity and internal heat" published in "Thermal Science and Engineering Progress. 1 (2017) 39–52”, where it was assumed that the surface convection is negligible and heat is transferred only by natural convection in the porous fin. In this present study, such an assumption has been relaxed. Also, effects of surface convective heat transfer on the thermal performance of porous fin with temperature-dependent thermal conductivity and internal heat generation have been investigated using Galerkin’s method of weighted residual. The results of the Galerkin’s method of weighted residual show excellent agreement with the results of numerical method using shooting method coupled with Runge-Kutta method and also with the results of homotopy perturbation method. Thereafter, the developed analytical solutions are used to investigate the influences of the thermal model parameters on the thermal performance of the porous fin. It is found as the with the other model parameters that as the convective parameter increases, the rate of heat transfer from the base of the fin increases and consequently, the porous fin efficiency improves. However, increase in the nonlinear thermal conductivity parameter decreases the temperature distribution in the fin. Based on the high accuracy of the Galerkin’s method of weighted residual as displayed in this work, it is hoped that the simple analytical solutions given by the approximate analytical method will enhance the analysis of extended surfaces and also assist the designers.
Źródło:
World Scientific News; 2019, 138, 2; 167-191
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additive Genetic Effect of Dam-sire, Dam, Common Maternal and Environmental Effect on Clutch Traits of Two Nigerian Local Chickens Populations
Autorzy:
Gwaza, D. S.
Dim, N. I.
Momoh, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1186738.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Tiv ecotypes
additive-effect
clutch-traits
dam-sire
Opis:
The study was conducted at Akpehe poultry farm, Makurdi. The objectives of the study were to assess the additive genetic effects of dam-sire, dam and maternal effects on clutch traits with the aim to apply these to selection and breeding in order to improve these traits.120 birds were used for the study, 60 each for the Fulani and the Tiv ecotypes. The birds were housed singly in identified cages and hand mated in the pen. Data were collected on clutch size, clutch number, pause length and number, month, sire, dam and ecotype. Ecotype significantly affected clutch size and clutch number. Pause length and number were not affected by ecotype. The additive genetic effect of the sire and dam significantly affected clutch size and clutch number. Heritability estimates due to sire on pulse length and pulse number were very low, while the heritability estimates for clutch number and clutch size were moderate. Non additive genetic effect of the dam ,other maternal environment as well as month significantly affected clutch number, pause length and number. Selecting superior birds based on clutch size and number due moderate heritability estimates will lead to genetic improvement in egg number especially when dam conditions and management employed are improved.
Źródło:
World Scientific News; 2016, 32; 1-12
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical approach into dynamic behavior of functionally graded circular plates resting on two-parameter foundations under excitation force
Autorzy:
Salawu, S. A.
Sobamowo, M. G.
Sadiq, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1030674.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Laplace-Padè
Nonlinear dynamic analysis
functional graded plate
two-dimensional differential transform
two-parameter foundations
Opis:
The study of dynamic behavior of functional graded circular plates has gained significant attention in engineering in recent time due to the vast application of the material in engineering and manufacturing industry. This study focus on the application of two-dimensional differential transform method to investigate the dynamic response of functional graded circular plates resting on two-parameter elastic foundations. However, the maximum deflection is obtained using dimensionless scheme, Laplace-Padè approximant is used to treat the small domain issue of the analytical solutions. Also, the solutions obtained are used for parametric investigation. From the results, it is found out that increase in Winkler, Pasternak and combine foundation parameters results to decrease in maximum deflection, increase in material properties of the functional graded plates leads to decrease in maximum deflection, clamped boundary condition has the lower deflection. Increasing the excitation frequency results in lower deflection. Results obtained maybe used as benchmark for validation of method using other approaches.
Źródło:
World Scientific News; 2020, 139, 2; 115-134
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal assessment of a convective porous moving fins of different material properties using Laplace-variational iterative method
Autorzy:
Sobamowo, M. G.
Kamiyo, O. M.
Salami, M. O.
Yinusa, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/1030678.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Exact Method
Laplace-variational iterative method
Thermal response
Variable thermal conductivity
variational iterative method
Opis:
Investigation on thermal responses of different materials subjected to variant environmental condition has been a subject of ever-increasing research interest for decades. As such, research studies have shown different materials exhibiting peculiar characteristics of commercially used heat enhancement devices. Therefore, this work presents an investigation on thermal behaviour of a convective porous moving fins with temperature dependent thermal conductivity for five different materials. These materials include copper, Aluminium, Silicon nitride, Silicon carbide and Stainless steel. A hybrid method, viz- Laplace-variational iterative method (LVIM) is used to solve the model equation developed. And a perfect agreement is achieved when the result obtained from LVIM is verified with the exact solution. The result obtained shows that silicon carbide compete favourably with copper as the most efficient material in heat enhancement, while stainless steel shows the least performance. It is hoped that this work will serve as a template and a helpful tool for both scientist and engineers’ in future design of fins.
Źródło:
World Scientific News; 2020, 139, 2; 135-154
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of concrete made with abakaliki quarry dust as fine aggregate using Scheffe’s optimization Model
Autorzy:
Chiemela, C.
Okoye, P.C.
Nwosu, P.C.
Oke, O.M.
Ohakwe, C.N.
Powiązania:
https://bibliotekanauki.pl/articles/11178.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
In recent years, Nigeria has witness rapid development especially in the area of infrastructural development like roads, bridges, buildings etc. The conventional methods used in concrete mixing have its own peculiar problems, like time wasting, material wasting and errors. These problems have been the cause of structural failures which has given rise to loss of life and properties. Hence the need to development a method that will take care of all these anomalies witness in the conventional method. This work is aim at removing these anomalies by the use of Scheffes optimization method. This optimization method can predict the compressive strength of a concrete given the mix ratios and also predict the mix ratios required to give a compressive strength for a particular concrete made by completely replacing river sand with quarry dust. With this method it will be easy to predict the compressive strength of concrete based on the type of structure it is to be used for, there by eliminating the problems associated with structural collapse due to errors in concrete mixing by conventional method.
Źródło:
International Letters of Natural Sciences; 2014, 15, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Analysis of Jump and Bifurcation Phenomena in a Forced Vibration of Geometrical Nonlinear Cantilever Beam: Application of Differential Transformation Method
Autorzy:
Sobamowo, M. G.
Yinusa, A. A.
Adeleye, O. A.
Oyelade, A. O.
Sadiq, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1031911.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bifurcation Phenomenon
Differential transformation method
Jump phenomenon
Nonlinear vibration
Phase plane
Opis:
One of the classical features exhibited in nonlinear dynamics of engineering systems is the jump phenomenon, which is the discontinuous change in the steady state response of a system as a parameter is slowly varied. Such phenomenon is characterized by large amplitude dynamic responses of systems to small amplitude disturbances. It is established that this phenomenon cannot be described by the standard asymptotic and perturbation methods because they are limited to the study of small amplitude responses to small disturbances. Therefore, this paper presents the application of differential transformation method-Padé approximant to the solution of jump and bifurcation phenomena for a geometrical nonlinear cantilever beam subjected to a harmonic excitation. The accuracy and validity of the analytical solutions obtained by the differential transformation method are shown through a comparison of the results of the analytical solution with the corresponding results of the numerical solution obtained by fourth-order Runge-Kutta method and also with the results in a past study using harmonic balancing method. With the aid of the differential transformation method-Padé approximant, the effects of the nonlinear parameters in the model equation on the dynamic response of the beam are investigated. Also, the sensitivity of the beam to the external excitation amplitude is analyzed. In the distributed forced vibration, the jump phenomenon appeared in the response amplitude by variation of the excitation frequency while in the resonance frequency, the beat phenomenon with harmonic motion is seen for low level of excitation amplitude. At a certain frequency, the jump and bifurcation phenomena are seen in the curves of responses versus excitation amplitude. Additionally, the plots of the phase plane and time history of the system response are shown. It is established that the differential transformation method is a very useful mathematical tool for dealing with the nonlinear problems.
Źródło:
World Scientific News; 2020, 140; 26-58
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impregnating storage materials with neem seed oil against Callosobruchus maculatus Fabricus (Coleoptera: Chrysomelidae: Bruchinae) in Stored Bambara Seeds (Vigna subterranean L.) Verdcourt
Autorzy:
Ojiako, F.O.
Zakka, U.
Dialoke, S.A.
Ahuchaogu, C.E.
Nnebue, O.M.
Izuogu, C.P.
Powiązania:
https://bibliotekanauki.pl/articles/11675.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Neem (Azadirachta indica A. Juss.) seed oil (NSO) is acclaimed to have some form of insecticidal action against more than 400 insect species in at least 10 to 13 orders. The main delimitating factor in the wide acceptance of this well tested plant as a storage pest bioinsecticide is its foul sulfurous smell and bitter taste which impinges on the acceptability and marketability of treated produce. To ameliorate this shortfall, therefore, an assessment of the potential of impregnating different storage materials; [plastic containers (PLC), Bagco bags (BCB), Black polyethylene bags (BPB), white polyethylene bags (WPB) and calico bags (CAB)], with NSO in the management of Callosobruchus maculatus (F.) in stored Bambara seeds (Vigna subterranea L.), was conducted in the laboratory. The experiment was laid out in a 4 x 5 factorial arrangement fitted into a completely randomized design (CRD). Factor A represented four concentrations of NSO (0.00, 0.50, 1.00, 1.50 ml/ 100g seed), while factor B were the five different storage materials. The treatments were replicated four times Generally, seeds stored with impregnated storage materials recorded more bruchids mortality, reduced oviposition rate, decreased number of emerged insects (F1 and F2) and had less damaged seeds (and hence decreased weevil perforation index, WPI) than the control. Concentration performance was dose related though the highest (1.50 %) did not differ statistically (P=0.05) from the medium (1.00 %) concentration. Seeds stored in BPBs had the highest mortalities, but recorded the lowest in number of eggs oviposited, egg/seed ratio, F1, F2 and cumulative emergence, respectively. These results differed significantly (P=0.05) with the seeds stored in other materials. BPB stored seeds were also the least damaged with lowest exit holes/seed, seeds with holes and WPI, respectively. The performance of BPB was closely followed by seeds stored in WPBs in all the parameters tested. Conversely, seeds stored in BCBs recorded the lowest mortalities but the highest in all other parameters assessed. Other storage materials (PLC and CAB) had better storage quality than BCB materials. Impregnation of storage materials with NSO could be a better option to direct seed application with its attendant drawback. The use of NSO impregnated black polyethylene bags, within the scope of the storage materials screened, to control damage by C. maculatus in stored Bambara seeds, should be encouraged.
Źródło:
International Letters of Natural Sciences; 2016, 52
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charcoal production: A promoter of deforestation in Nigeria
Autorzy:
Isese, M. O. O.
Powiązania:
https://bibliotekanauki.pl/articles/1076595.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bombax buonopozense
Charcoal production
Deforestation
Ficus sur
Forest degradation
Khaya ivorensis
Tectona grandis
Tree plant
Vitellaria paradoxa
greenhouse gases
Opis:
Charcoal production in Nigeria is a growing source of concern for government and forestry institutions because of its perceived impact on the environment. The agreed impact is deforestation, i.e., the clearance of indiscriminate cutting of forest trees. Forest degradation associated with charcoal production is difficult to monitor and overlooked and under-represented in forest cover change and carbon emission estimates. Emissions of greenhouse gases a consequence of deforestation from charcoal production in tropical ecosystems in 2009 are estimated at 71.2 million t for carbon dioxide and 1.3 million t for methane. Trees used for charcoal production are Vitellaria paradoxa, Ficus sur, Tectona grandis, Khaya ivorensis, Bombax buonopozense just to mention a few. This review aims to further discredit the act of indiscriminate forest tree falling for charcoal production which have proofed by various works as a promoter of deforestation.
Źródło:
World News of Natural Sciences; 2019, 27; 1-10
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intercrop advantages of some improved sweet potato + soybean in Makurdi, Benue State, Nigeria
Autorzy:
Egbe, M.O.
Osang, P.O.
Powiązania:
https://bibliotekanauki.pl/articles/11880.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
Field trials were conducted during 2011 and 2012 cropping seasons at the Teaching and Research Farm of the University of Agriculture Makurdi, Benue State located in Southern Guinea Savanna of Nigeria. The objective of the study was to evaluate the response of some improved sweet potato varieties planted at three densities to intercropping with soybean. The experiment was a 2x3x3 split-split plot laid out in a randomized complete block design with three replications. The main plot consisted of two cropping systems [sole cropping (sweet potato, soybean) and intercropping (sweet potato + soybean). The sub-plot consisted of three sweet potato varieties (CIP440037, NRSP/05/007C and CIP440141). The sub-sub-plot treatment comprised of three sweet potato planting densities (25,000 plants/ha, 33,000 plants/ha and 50,000 plants/ha). Intercropping severely depressed the yields of both sweet potato varieties and the soybean component, such that intercrop yields were rarely above 50% of sole crop yields, irrespective of the sweet potato variety used. The number and weight of the sweet potato component was not significantly affected at the planting density of 50,000 plants/ha. Indices used to measure intercrop advantage showed that intercropping these sweet potato varieties with soybean was biologically efficient and percentage land saved varied from 23.08 and 32.43. Soybean was more competitive than sweet potato at all densities tested.
Źródło:
International Letters of Natural Sciences; 2015, 39
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maize-soybean intercropping system: effects on Striga control, grain yields and economic productivity at Tarka, Benue State, Nigeria
Autorzy:
Ijoyah, M.O.
Powiązania:
https://bibliotekanauki.pl/articles/11604.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Striga hermonthica
purple
giant witchweed zob.purple
maize
soybean
intercropping
plant control
grain yield
economic productivity
Benue State
Nigeria
Opis:
On-Farm trials were conducted from July to November during the 2009 and 2010 cropping seasons, at Tarka, Benue State, Nigeria to evaluate the effects of intercropping maize and soybean on striga control, grain yields and economic productivity. The treatments consisted of sole maize, sole soybean and the intercrop of maize and soybean, replicated three times in a randomized complete block design. The results obtained showed that intercropping maize and soybean significantly (P ≤ 0.05) reduced striga shoot count by 55.9 % and 56.1 % respectively, in 2009 and 2010 compared to that produced on pure maize plots. Number of affected maize plants, lodging score of maize and infestation rate were lower for intercropping than for sole maize plots. The severity level was also recorded lower for intercropping compared to that recorded for pure maize stands, where severity level is in the range of high to very high. Though, soybean yield was reduced by intercropping, however, soybean and maize intercropping system increased maize grain yield, total intercrop yield, land equivalent coefficient greater than 0.25, land equivalent ratio values greater than one (LER > 1), higher total intercrop values and monetary equivalent ratio greater than 1.00, indicating yield and economic advantages. The implication of study showed that intercropping maize and soybean can be adopted by farmers as an efficient cropping system strategy to reduce striga infestation, increase maize yield and give greater economic productivity.
Źródło:
International Letters of Natural Sciences; 2014, 14
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 101

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