International Journal of Ground Sediment & Water

595-622

Authors: Olumuyiwa Olusola Falowo, Williams Kola Olabisi

The objectives of the study are to assess the engineering competence of the subsoil and develop a subsoil competence map for northern parts of Ondo State, Nigeria, using integrated remote sensing, geotechnical, geophysical and geological investigations, and hydrogeological measurements. The generated subsoil competence map was obtained by integrating the results data of these parameters measured: topsoil resistivity and thickness, plasticity index, shear strength, allowable bearing pressure, soil association, lineament density, and groundwater level. Based on the design, the obtained settlement values were within the 25 mm commonly recommended. Consequently, the map classified the study area into moderate competence (60%), high competence (35%), and very high competence (5%). The corrosivity map of the topsoil shows predominant moderate to mildly corrosivity, prominently in Ose and Akoko areas and constitutes about 70 %. This type of corrosivity is suitable for buried communication equipment and electrodes. In conclusion, shallow foundations such as pad or raft foundation of reinforced concrete can be adopted for buildings. Also, the soil geotechnical properties will support adequately road structures and various earthworks. However, areas characterized by moderate competence material can be improved by less expensive mechanical compaction and proper use of admixtures (lime, cement, bituminous addition, sand/gravel grading) to increase bearing capacity, compaction, and shear strength, which will invariably reduce compressibility, settlement, and permeability. © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/

645-657

Authors: Teshale Jabessa, Ketema Bekele, Zinash Amare

The study was conducted to identify adaptable high biomass, leaf to steam ratio, and good quality yield of Alfalfa cultivars at Bore Agricultural research center. Eight Alfalfa cultivars; Hunter river, Magna-801-FG, Pioneer (1995) DZF-406, Segule1396 (408), Peruvian DZF (406), F-G-9-09, F-L-L-77-(406), and Hunter river (4010) were tested in RCBD with three replications. Plant height was significantly (P < 0.05) higher for Hairy (1995) DZF-406 cultivar (83 cm) while lower for Magna-801-FG. Disease resistance was significantly different (P < 0.05) among cultivars. Segue (1396)-408 cultivars were highly resistant to diseases compared to others. Leaf to stem ratio, biomass yield, and seed yield did not show significant (P > 0.05) differences among treatments. Regarding chemical compositions of NDF, ADL and CP were significantly (P < 0.05) different among treatments. The superior ADL was obtained from Segule (1396)-408 cultivar (32.5%) while, the low was obtained from F-L-L-77 (406) cultivar. The superior NDF was obtained from Poineer (1995) DZF-406 cultivar (70.7%) whereas; the low was from Peruvien- DZF- 406 cultivars (45.9%). The CP yield showed a significant (P < 0.05) difference among cultivars. Magna- 801-FG cultivar had the superior (26.3%) CP while Segule (1396)-408 cultivar (11.3%) had the inferior CP content. Cultivar F-G-9-09 was produced superior in DM (91.8%) and less in ADL (9.3%) while Segule 1396 (1396)-408 cultivar produce (91.3%) DM and lower in TASH (10.8%). superior OM has obtained from Segule 1396 (408) cultivar (80.4%) compared to others. Based on its yield, plant height, biomass yield, and chemical compositions, good DM and OM Peruvien- DZF- 406, F-L-L-77 (406,) Segule-1396 (408), and F-G-9-09 is recommended for further promotion in the highland and midland of Guji and similar agro-ecologies. © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/

681-694

Authors: Jichao Sun

In the course teaching of introduction to Hydraulic and hydroelectric engineering in the hydrology and Water Resources Engineering major of China University of Geosciences (Beijing), to obtain teaching effect, and guide and adjust the teaching schedule and content. This paper studies and establishes two monitoring systems, the two-dimensional code anonymous grading system, and the teaching quality quantified grading system, to monitor the course. The two monitoring systems can be generally accepted by students and have positive effects. Through the use of a monitoring system in teaching from 2017 to 2019, remarkable results have been achieved, including a series of achievements in teaching reform, engineering practice, student innovation, and other aspects. At the same time, it has a good reference, reference, and promotion significance in courses with similar characteristics. © International Journal of Ground Sediment & Water, ©Sun Jichao. The website is https://ijgsw.eu.org/ http://ijgsw.net/