This volume focuses on reclamation, management, and utilization of salt-affected soils, their sustainable use, and evaluation of plants inhabiting naturally occurring saline habitats. It is of interest to scientists and students as well as agricultural institutions and farmers to increase the awareness of salinity problems. The volume is supported by UNESCO Doha, Qatar, and has an international authorship.
Biogas plants have become something of a permanent fixture in Technical Cooperation between
the Federal Republic of Germany and partners in developing countries. Dating back to 1977, the
first such projects were incorporated into cooperative efforts with Indian and Ethiopian
organizations. At about the same time, the first GTZ project dealing solely with the transfer of
biogas technology and the construction of biogas plants was launched in Cameroon.
In the meantime, GTZ has assisted in building and commissioning several hundred biogas plants in
Asia, Africa, South and Central America. While most of the systems, in question are on a small
scale intended to supply family farms with energy and organic fertilizer, some large-scale systems
with the capacity to generate more than 100 m³ of biogas daily have been installed on large stock
farms and agroindustrial estates.
In general, biogas technology is for rural areas. In addition to generating energy, biogas systems
help stimulate ecologically beneficial closed-loop systems in the agricultural sector while serving to
improve soil quality and promote progress in animal husbandry. Consequently, the promotion of
biogas technology is regarded as an integral part of technical cooperation in rural areas and, hence,
as a key sector of development cooperation on the part of the Federal Republic of Germany.
Aphids are well-known as pests of agriculture, horticulture and forestry, but they are also one of the most biologically interesting groups of plant-feeding insects, and thus have attracted the attention of biologists in many research fields such as ecology, biodiversity, physiology, behaviour and genetics.
Following the successful format of previous books on the world’s aphids by the same authors, these two volumes provide a comprehensive species-by-species account of the aphids on the world’s herbaceous plants and shrubs. They can be used not only as an identification guide and information source for entomologists and taxonomists throughout the world, but also as a unique database for studies of biodiversity and insect-plant relationships. In all, 3120 aphid species in 340 genera are covered, feeding on 2150 genera of host plants. Volume 1 features comprehensive host lists and keys to the aphids colonizing each plant genus. This information is supplemented in Volume 2 by a systematic account of all the aphid species, which provides information on their appearance in life, host range, geographical distribution and life cycles. There are 357 original line drawings, 252 photographs of slide-mounted specimens and 1000 references.
Manual on making and using methane — biogas. Fry developed his techniques while running a pig farm in South Africa, designing the first full scale displacement methane plant. Good information on integrating biogas production with gardening and farming, and with pond-culture food production. Designs for a Sump Digester using 55-gal oil drums and an Inner Tube Digester.