The Study of Granular Chemical Applicator (I)
1965 Volume 27 Issue 3 Pages 178-184
Details
1965 Volume 27 Issue 3 Pages 178-184
It is the recent research in the studying circles of the pest control, that applicates the granuler chemicals such as the herbicide and insecticide to the paddy fields by the granular applicator, except for the granular fertilizer with use of the broadcaster to upland fields. Before the studies, it is not only important for the planning and designing of applicator, but also for secureing the pest control effects, to investigate the fundamental characters of the application of granules.
The results of these studies are as follows:
1. The fitting ranges of diameter of granules on the mechanism of applicator and the effects control were from 0.3 to 1.25mm, and its probability density function will be expressed by the normal distribution function of Gauss.
2. The constant discharge of granules through the adjusting shutter which is situated in the bottom of the tank is essential, because the uniform distribution on the field surface is expected by constant discharge. Moreover, to keep the constant discharge, the angles of repose and the moisture contents of granule should be in the suitable ranges. In this study, it was found that the angles of repose are 36-38 degrees, and the moisture contents are not exceeding 20% in weight, when the carrier of granular chemicals is the bentonite.
3. The application rate of granular chemicals is 3kg per 10 ares which was recommended by the studies of agricultural chemicals. In the mutual relations between the rate of work and the discharge from applicator, the areas of adjusting shutter are important factors for the uniform effects. In this study, it was decided that the ranges of shutter areas are about 40-80mm2, when the applicating times of 3kg are about 5-15 minutes, using the granules, ranging from 0.3 to 1.25 mm diameter.
4. In general, the tank must have the agitator in the bottom to keep the continuos discharge. But it is not always necessary for this granular applicator to provide the agitator, when using the above mentioned shutter areas and distribution diameter of granule.
