Abstract
Spraying pig waste-derived sludge on sugarcane fields is beneficial to sugarcane farmers and pig farmers. In the southern part of the Okinawa Island, the sludge is loaded on a tank truck and sprayed across the fields with a hose, which is connected to an engine pump. However, due to the hard work involved and the low efficiency level, it is not a very popular technique. It has become clear that the following method may be successful: i) setting up four hoses with many small holes on the sugarcane fields, ii) mounting two engine pumps on a 10t tank truck, iii) spraying the sludge through all four hoses (connected to the two engine pumps) at once. In order to use the hoses efficiently, they are not permanently set but moved to other fields as needed.
