02420     2200217   4500001002100000005001500021035002000036007000300056008004100059020001800100100002300118245009200141260006500233300002900298520178800327650003202115650001302147082001002160084001602170990001602186INLIS00000000000119320240729021801  a0010-0224000163ta240729                g          0 eng    a971-104-185-51 acampbell K. joseph1 adibble sticks donkeys, and diesels :bmachines in crop production /cjoseph K. campbell  anew york USA :binternational rice research institute,c1990  a328 Hlm :bilus ;c23 cm  aDibble Sticks, Donkeys, and Diesels: Machines in Crop Pro- duction is a broad study of agricultural mechanization, from simple hand tools to self-propelled harvesters. The book is for the non-agricultural engineer who wants to learn about the wide diversity of power and machines used by farmers to produce our staple food and fiber crops. It provides the reader with information needed to weigh the advantages and disad- vantages of specific types of machines. For example, what are the trade-offs between a pedestrian tractor and a hydrotiller? Why are short-handled hoes used in Africa? For human transport of loads, why is the limber bamboo carrying stick of Asia superior to the rigid poles used in some other countries?

The author, Joseph K. Campbell, answers these and many other questions in this survey of technological development in crop production. Over the last 100 years, the shift from muscle to engine power has changed agriculture dramatically. Often ignored, however, is the fact that most of the farmers in the world still depend on animal power as their main source of draft energy.

The lessons leamed in recent decades are important to document. We now know that direct transfer of knowledge from one environment to another often leads to wrong solutions to critical problems. At the same time, it is most valuable to know how, when, where, and why technological change took place. With this information, the adaptation of knowledge and the development of technological solutions according to local needs are easier to achieve.

Not many people today have the combined skills to compile the kind of information found in this book. Professor Campbell has more than 40 years of worldwide experience in agriculture. He was born into a family of Pennsylvania 4amachines in crop production 4aRak Umum  a631.3  a631.3 CAM d  a00000002325