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Discriminant functions for classifying erosion degraded lands at Otamiri, Southeastern Nigeria
Full text linkThis article contain tablesThis study was conducted to evaluate the effect of natural in-situ erosion on soil physico-chemical properties and to identify indicator variables associated with various degrees of erosion on a Southern Nigeria Ultisol. A preliminary survey conducted in 1997 had delineated four erosion phases on a contiguous sloping land within a watershed The erosion classes were Non-eroded (NE), Slight (S), Moderate (M) and Severely eroded (Sv) based primarily on Ap horizon thickness. Field experiments and laboratory analysis were done in/998/99. Definite consistent relationships that were statistically significant were observed between erosion class and some soil physical and chemical properties of surface 0–10 cm layer: Among these were silt/clay ratio which ranged from 0.29 in NE to 0.19 in Sv; fine sand/coarse sand ratio were 0.33 (NE), 0.31 (S), 0.17 (M) and 0.19 (SV). Soil organic carbon (SOC) declined from 1.01% in NE to 0.60% in Sw, and (Ca+ Mg)/(Al+ H) ratio, used to infer nutrient imbalance, also decline from 1.23 in ME to 0.43 in Sv. Aluminum saturation percentage increased from 33% in NE to 60% in Sw, and Ca/Mg ratio from I. 14 (NE) to 1.62 (Sv). Pedo transfer functions suggested that erosion–induced soil alterations are more process based than simple factor dependent. It is therefore recommended that in this environment the prediction of erosion hazard and the identification of erosion classes be based on discriminant analysis derived from silt/clay, fine sand/coarse sand, Ca/Mg, and (Ca+ Mg)/(Al+ H) ratios. Soil organic carbon and Al""" saturation are equally important indicator variables.World Bank and FUT
Structural stability and carbohydrate contents of an ultisol under different management systems
No full textThis article contain tablesAn understanding of the dynamics of soil carbohydrate pools is necessary for assessing the impact of organic residue management in organic matter build up and structural stability in tropical ecosystems. The objectives of this study were to evaluate temporal changes in aggregate stability and cold water-soluble, hot water-soluble and acid-soluble carbohydrate fractions of a sandy soil under different organic residue management practices. The soil is an Nkpologu sandy clay loam (fine loamy, kaolinitic, isohyperthermic, typic kandiustult) at Nsukka in southeastern Nigeria. In July 1995, it was incorporated with complete fertiliser (N:P:K ¼ 12:12:17 at 480 kg/ha) (F); rice mill wastes (RW, 10 t/ha); RW þ F; poultry manure (PM, 10 t/
ha) and RWð5t=haÞþPMð5t=haÞ up to the 0–20 cm depth. A control, tilled up to the 0–20 cm depth, was also included Surface soil samples (0–20 cm), collected at 3, 6 and 12 months after residue applications were used to measure changes in aggregate stability by mean weight diameter (MWD), total OC and carbohydrate pools. In all treatments MWD increased whereas the concentrations of acid-soluble, hot water-soluble and cold water-soluble carbohydrates decreased with sampling time. Also irrespective of the type of amendment, the carbohydrate concentrations at each sampling period varied in the order, acid-soluble > hotwater-soluble > coldwater-soluble. Aggregate stability correlated very poorly with all the carbohydrate fractions and OC. The correlation coefficient values were rather low and did not mean much in the physical interpretation of these results. This shows that these carbohydrate pools were not very effective in stabilizing the soil aggregates.European Unio
Poor funding responsibility for technological underdevelopment.
No full textNewsletter of Federal University of Technology, Owerri.Federal University of Technology, Owerri. Information and Public Relations Unit
Degree options in Environmental Technology( Special report on ADIS)
No full textNewsletter of Federal University of Technology Owerri.Federal University of Technology, Owerri, Information and Public Relations Unit
The return of the man of history.
No full textNewsletter of Federal University of Technology, Owerri.Federal University of Technology, Owerri. Information and Public Relations Unit
Environmental pollution : The scourge of lifekind
No full textThis public lecture series of the FUTO conatins figures and tablesFederal University of Technology, Owerri, Nigeri