Abstract
Efficient sprinkler spraying, arrangement and a rational, economical piping method with a lateral line for agrichemichal spraying of citrus groves were examined. It was clarified that when spraying, the crown of a tree must be done at least by two sprinklers from opposite directions to allow for the agrichemical solution to adhere. Even adhesion of an agrichemical solution can be.obtained by decreasing the spacing distance between the sprinklers, but this is costly. From the viewpoint of intensity of sprinkling and installation cost, square spacing is preferred.
The spraying distance is controlled by the angle of elevation during sprinkling. When the riser is inclined toward the bottom of an inclined field, a formula to figure out the angle (β1) of sprinkling toward the contour line is as follows:
sinβ1=sinγ/cosα(°)
γ: angle of the sprinkler nozzle itselt (°)
α: inclining angle of riser (°)
The sprinkling distance at a different slope and angle of sprinkling was obtained from a sprinkling test of M I and M III type sprinklers. Then, the proper spacing and inclination angle of the riser at a different inclined grove were suggested. Lateral lines at an inclined grove must be arranged downward in a comblike shape, because of the loss of the remaining solution in the riser, and the installation cost.
A lateral line at ground level must be arranged in arborescence pipeline system, because it is the most rational and economical method.
