SOIL TYPES

This study investigates the relationship between crop performance, fertilizer application, and soil types using multivariate statistical analysis. The main objective is to determine how different fertilizer types and the rate of application, in combination with soil characteristics, influence major growth and yield parameters of crops. Data were collected on soil properties
(such as pH, organic matter, nitrogen, phosphorus, potassium, and texture) and crop growth parameters (including germination percentage, plant height, number of leaves, leaf area, biomass, and yield). The canonical correlation analysis was employed to identify patterns and quantify the strength of associations among these variables. The results revealed that soil fertility factors and fertilizer applications significantly influenced crop growth and yield performance, with organic matter and fertilizer rate producing optimal responses. The analysis demonstrates the usefulness of Canonical Correlation Analysis in handling complex agricultural data.

This project was a detailed investigation on the properties of subgrade soils used in the construction of Warri-Sapele road in South South, Nigeria. Subgrade samples were collected at nine (9) different spot by doing auger borings examinations on the spots that are observed to have failed or are failing at about 5 and 10 meters away from the tarred road at one side. The samples were subjected to the following laboratory tests; Compaction test, California bearing ratio (CBR). According to O'Flaherty the range of value anticipated using standard proctor test method are MDD and OMC which range from 1.72g/cm3 to 1.84g/cm3 and 8.88% to 12.70% respectively, therefore the results indicated that all the samples were sandy clay in texture. The CBR values for the top unsoaked and soaked samples of the subgrade soil range from 21.9% to 37.5% and 5.0% to 26.1% respectively while bottom unsoaked and soaked range from 17.9% to 51.5% and 9.3% ((P2R3, Sapele) to 37.3% respectively. Therefore, the CBR test results obtained conform to the Federal Ministry of Works and Housing which confirmed that the subgrade sample materials are suitable for road construction except for subgrade materials P2R3 collected from Sapele which however can be stabilized to meet the standard requirement before being used .These data obtained from the analysis can be useful by civil engineers in the design and construction of the study area for maximum durability.