抄録
In orchards and tea-gardens, sprinkler systems have been installed for applying rather agricultural chemicals and fertilizers than irrigation water. In future they may be used to apply herbicides, fruit ripeners, and chemicals for picking excessive flowers or fruits.
Uniformity of application, which is specially required in applying these chemicals, is affected by variations among discharges of the individual sprinklers. Using pressure regulators or flow controllers on the sprinkler nozzles, the variations are made even. But it cost the farmer as high as the price of the sprinkler nozzles.
For saving the equipment cost, we contrived the method to uniformalize the pressure at a nozzle by a orifice that fitted in each applying point. The optimum orifices were selected experimentally from measuring the primary pressures of pressure regulators and from pressure drop diagrams of the orifices Fig. 5 or Fig. 6.
