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Optimal road spacing for manual skidding sulkies
No full textJournal of Tropical Forest Science, 1999; 6 (1): 8-15An optimal road spacing is the one which minimizes the overall sum of skidding costs, road construction and road maintenance costs. As road spacing increases, skidding cost increases while road construction and maintenance cost decreases. Each skidding means has its own optimal skidding distance and road spacing. This study analyses skidding productions and optimal road spacing for hand sulkies skidding logs in one of the forest plantations in Tanzania. Results from this study indicate that when undertaking thinning operations especially in flat to gentle sloping terrains, sulky skidding could be considered as a better alternative to tractor and manual skidding methods. Besides being simple and cheap, the system causes minimum stand and soil damages, creates employment opportunities for the rural people and does not demand foreign capital .The average skidding distance in this study was measured to be 71 m while average skidding production was estimated to be 1.21 m3/man-hour. An optimal road spacing which minimizes the overall total costs in this forest was found to be 137 m
Land use and land evaluation Systems Research Project
No full textIt is a report based on the work of the land use and land evaluation teamJapanese International Cooperation Agency (JICA
Soils of the Allidina and Lutindi estates in Kilosa District and their agricultural potential
No full textA consultancy reportThis report presents the results of a feasibility study of agricultural
development of the Allidina and Lutindi Estates in Kilosa district, following
a request by the owners (Azania Agricultural Enterprises Ltd).
The study was undertaken inform of site evaluations coupled with soil profile
descriptions and sampling and laboratory analysis of both soil and water
samples. The environmental conditions were also assessed, and finally the
agricultural development potential was determined.Azania Agricultural Enterprises Lt
Testing and improvement of a questionnaire to users soil maps
No full textSoil survey and evaluation; 7(1987): 33-42Ninety-four people from 35 countries responded to a questionnaire on the
use of soil maps. Most respondents had used soil maps in the fields of
agriculture, of forestry, soil conservation, environmental pollution and
protection. 98% of the respondents had used soil maps for locating
suitable areas for their professional work, 15% for teaching and research
and 13% had also used soil maps to help get financial assistance. Less
than half of the respondents had used interpretation maps derived from
soil maps. Most maps were produced by government soil survey institutes,
but 51% had also used soil maps produced by other government
institutions including universities and research stations. Only 19% had
used soil maps made by private soil survey organizations. Major
problems encountered in using soil maps include poor legibility, problems
of location on the maps, vague and complicated terminology. Most
respondents felt that soil maps are essential for their projects. Only a
few found soil maps completely useless. Based on the problems
encountered while using soil maps, recommendations have been made to
those involved in soil resource inventories. A revised questionnaire has
also been proposed following comments made by the respondents of the
previous oneState University of Ghen
The effect of some organic acids on phosphorus solubility in soils
No full textArticleThe study on the solubility of phosphorus in three soil
types of California (ranging frm ac id to calcareous soils) by
three organic ligands (fumarate, oxalate and citrate) showed
that important quantities are solubilized by these acids.
Oxalic acid prove d to be more effective in solubilizing P than
citric and f'umar ic acids for Hugo and Calera soils. However,
for Linne soil citrate proved superior over the other two
ligands. For all the soils, an increase in the concentration
of organic ligand resulted in an increase in solubilized
Phosphorus. Such an increase was more pronounc ed for calcareous
soil (Linne) than was the case for the other non-calcareous
soils.State University Ghen
Inter-relationships among important soil properties based on data of some typic paleudults
No full textArticleA study of inter-relationships among important soil
characterization physico-chemical data was made. These data
were extracted from thirty soil profile descriptions representing
soils developed on different parent materials and classified as
Typic Paleudults according to the USDA Soil Taxonomy (1975).
Correlation studies indicate that most of these parameters
are highly correlated.State University Ghent, International Training
Centre for Post-Graduate Soil Scientists,
Department of General Pedology
Genotype and soil fertility interaction in the growth of black spruce progeny from a central New Brunswick population
No full textCanadian Journal of Forest Research, 1985, 15(2): 410-416.Seedlings representing 10 half-sib families from a black spruce (Piceamariana (Mill.) B.S.P.) stand in central New Brunswick were raised in a greenhouse on three different soils, each with two levels of fertility. Seedling growth varied significantly with soil, fertility, and half-sib family. After 7 months mean dry weights, for example, ranged from 0.292 to 0.755 g with soil, 0.174 to 0.936 g with level of fertility, and 0.370 to 0.657 g with family. With soil and fertility considered fixed variables, the family and family–fertility interaction accounted for approximately 3 and 20% of the phenotypic variation in mean seedling dry weight, respectively. Similar variance components were observed for shoot and root weights, and root collar diameter. Based on the family – soil fertility interaction, the population was divided into groups of (i) broadly adapted families showing average performance through the full range of fertility environments, (ii) strong responders, i.e., families performing below average at low fertility, but showing a large fertilization response, and (iii) weak or nonresponders, i.e., families performing poorly in all fertility environments
Pedological and edaphological properties of the soils of two soil associations in the Morogoro area, Tanzania
No full textTrop. Agric. (Trinidad) Vol.59 No.2 April 1982Pedological and edaphological properties of two soil associations forming a continuum from the Uluguru
\mountain ranges to the Mindu mountain in the Morogoro area, Tanzania, have been investigated. The general
/eatures of the area, including climate, geology and vegetation are discussed as is the movement of soluble salts
on the slopes and its effects on soil composition. The investigation shows that there is a close connection
between the three soil forming factors, climate, parent material, and relief and the mineral composition of the
soils and their edaphological properties. This means that a thorough understanding of the soil forming factors
and the soil development processes provides a key to land use evaluation of an area like this, where soil data
often are lacking
The Perceived Importance of Communication Skills Courses among University Students: the case of two universities in Tanzania
No full textInternational Journal of Education and Research 2015; 3 (2) : 497-508This article is about the perceived importance of communication skills courses among Tanzanian
university students. A total of 134 undergraduate students, randomly selected from two Tanzanian
universities, were involved in this study. The study adopted a case study design in order to have an
in-depth understanding of the phenomenon under investigation. The data were collected through
interview schedules and they were analysed using thematic content analysis in which they were
coded and classified according to themes generated from the responses. The findings revealed that
communication skills courses were perceived by the majority of the respondents as important
courses for the acquisition of communication skills needed in academic settings. It is recommended
that universities should strive to improve the delivery of the courses by ensuring that both human
and material resources are adequately available for the purpose of enabling students to benefit more
from the course