Vol. 16—1962 - NorthEastern Weed Science Society

337
SRFeader 1
On this spreader only the main 'effects were significantly different and
all were linear in effect. The output was inversely proportional to the speed. .
as seen with the previous applicatoi'll. As the particle size became smaller there
was a consistant increase in the application rate of the spreader (Table 3).
Also the amount delivered decreased as the level of material in the hopper was
lessened (Figure 2). The lack of statistical significance between the columns
in Figure 2 for the 15/30 granule size is due to the wide variation in the
amount of material delivered in different runs with all variables constant.
Table 3. The effect of speed. particle size and degree of hopper fi11ingoh
the amount of granular material (in gms) delivered by Spreader 1*.
Degree of Hopper Fullness
Particle Size S full ; full Full , .
2 mph
15/30 441.8 a 516.3 b 538.8 b
24/48 553.3 b 545.0 b 610.8 c
30/60 642.5 c 609.3 c 613.0 c
3 mph
15/30 362.5 a 384.0 ab 417.8 be
24/48 453.5 cd 444.3 cd 476.3 d
30/60 491.0 d 568.0 e 563.0 e
*
numbers followed by the same letter at anyone speed
are not significantly different from each' other.
Spreader 2
On this lawn spreader the three main effacts were less linear in nature
than with Spreader 1. There was again a decrease in the rate of application
as the ,speed was increased. The amount delivered of each granule size showed
a slight increase in going from the 15/30 to the 24/48 granule size and then a
sharp increase when the 30/00 partio1e size was used. When the effect of hopper
level was measured with the 24/48 particle size there was a sharp decrease in
the amount metered by the spreader between the full and half hopper level.
followed by a sharp increase to almost the full hopper rate at the quarter hopper
level. . ..
The interaction of granule size x·hopper level showed that the granule
sizes did not act in the same manner for all hopper levels. as shown in figure 2.