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Articles by E.T. Eshett
Total Records ( 4 ) for E.T. Eshett
  E.U. Onweremadu , E.T. Eshett , U.E. Ogundu , C.P. Anyanwu and J.C. Obiefuna
  The study investigated influence of some soil properties on sorption and bioaccessibility of cationic chromium [Cr (III)] of rangeland soils proximal to military settlement at Obinze, Southeastern Nigeria in 2006. Field sampling was guided by a transect drawn from an open dump site away towards River Otamiri, Owerri, Southeastern Nigeria. Three land units, namely A, B and C from which soil samples were collected and analyzed using routine and special techniques. Soil and plant data were subjected to analysis of variance (ANOVA) of the Mix-model of SAS computer software and multiple regression analysis for purpose of modelling. Results showed that Cr sorption and biaccessibility varied among land units with the entire site having high potentials of bioavailability and biotoxicity. It was also found that clay-content, cation exchange capacity, soil pH and total inorganic carbon are good predictors of Cr (III) bioaccessibility in studied soil.
  E.U. Onweremadu , E.T. Eshett , M.C. Ofoh , M.I. Nwufo and J.C. Obiefuna
  We investigated the effects of Bulk Density (BD) and moisture content θv on seedling performance on a Typic Topaquept at Iyienyi Ibeku, Abia State, Southeastern Nigeria in 2005/2006 study session. A transect technique aided field soil sampling at identified physiographic units of Crest, Midslope and Footslope. A 7x7 factorial greenhouse experiment was conducted to create a matrix of BD and θv which enabled better understanding of compaction effects on seedling growth of Citrus sinensis Var Etinan. Data were subjected to statistical analysis using SAS computer software. Results showed that BD and soil strength decreased with mean root length density. Again, BD had significant (p< 0.0001) negative correlations with root performance. Moisture content had a significant positive correlation with root performance (R = 0.72; p< 0.0001). Soil moisture and BD were good predictors of root length density (R2 = 0.79) with high degree of accuracy (RMSE = 0.07) and slight over-estimation (Bias = + 0.0001): Mean root length density increased downslope and this was the trend in shoot yield. Fairly high values of coefficient of alienation, suggest the inclusion of other relevant variables in future modelling.
  I.I. Ibeawuchi , M.I. Nwufo , N.N. Oti , C.C. Opara and E.T. Eshett
  A split-plot in a Randomized Complete Block Design was used to conduct the experiment in 2003 and repeated in 2004. The main treatments applied were 5 rates of poultry manure, which include (0 kg ha -1) as control 250, 5000, 7500 and 10,000 kg ha-1. The sub treatments were different cropping systems which include intercropped green and waterleaf, sole green and sole waterleaf. Results indicate no significant differences in heights (cm) among all the treatments that had poultry manure at all rates of application but differed significantly (p>=0.05) with the control that had zero poultry manure. Intercropping Amaranthus cruentus with Talinum triangulare at the application of 7500 kg ha-1 poultry manure was significantly different (p>=0.05) from all the sole crops and intercrops with or without poultry manure application. This gave the highest economic yield of 3633 kg ha-1 intercropped green, 3517 kg ha-1 intercropped waterleaf and 3530 kg ha-1 and 3299 k ha-1 for sole green and waterleaf, respectively. However, there was diminishing return on the yield after, indicating that addition of more poultry manure beyond 7500 kg ha-1 had no effect on crop productivity. Also, intercropping with application of 7500 kg ha-1 poultry manure gave the highest land equivalent ratio (LER) of 2.06 and monetary yield of N1,262,500.00 ha-1 and was significantly different (p>=0.05) from the other treatments. The lowest monetary yield of N247,500.00 ha-1 was obtained from sole cropped Amaranthus cruentus. The use of poultry manure rates especially 7500, 5000 and 10,000 kg ha-1 may be recommended depending on the sole cropping of green and waterleaf. The LER and monetary yield indicate that a farmer can make a good living by engaging in the production of green and waterleaf vegetables especially during the dry seasons of the year.
  E.U. Onweremadu and E.T. Eshett
  This study investigated the distribution of soil boron and its relationship with some soil properties in a sandy Paleudult polluted by crude oil in southeastern Nigeria. Three pedons representing 3 land units influenced by crude oil spillage were dug, sampled and soil samples were used for various laboratory analyses. Results showed high values of organic carbon and cation exchange capacity in spilled sites. Iron and aluminium oxides were higher in non-spilled sites and generally increased with depth. Highest values of B (0.09-146 mmol kg-1) were found in spilled land unit while soil B ranged from 0.01-0.03 mmol kg-1 in non-spilled land unit. Soil B varied widely in spilled land units but little variation was observed in non-spilled site. Higher values of correlation coefficients were recorded in non-spilled land unit than spilled site. Best predictions was found when soil pH, surface area of clay, clay content and organic carbon predictors were combined linearly.
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