Studies on the power sprayer. (I)

On the spraying method of power sprayer (1)

Abstract

We studied on the most effective and economical spraying method with power sprayer for pest control.
The boom which we used in this experiment was a pipe with 10 spray-nozzles.
Each nozzles were placed at interval of 11cm and their sizes were 0.8mm in diameter. The boom was moved by the equipment shown Fig 1.
The results were as follows:
1) When the height of spraying (H) from the top of plant was lower than 40cm, the adhesion of chemicals was too much and ununiform, but when it was heigher than 40cm, the adhesion was decreased. In the case of the height in 40cm, we had the best result. (Fig. 2)
2) The speed of spraying (s), that is quantity of spraying chemicals, must be heigher than 77cm/sec. When it was lower than 77cm/sec, the quantity of spraying chemicals increased, but the increasing ratio of adhesion reduced. (Fig 3)
3) As the pressure of spraying (P) became higher, the adhesion did not increase so large as expected from the increased quantity of spraying chemicals. It's effect of pest control was smaller than the effect by the height and speed of spraying and the structuce of boom. (Fig 4)
4) The adhesion increased in proportion to the growth of rice plant. (Fig 5)