Vol. 16—1962 - NorthEastern Weed Science Society

344
The degree 01' oorn inj~ obtained with the various particle
sizes and breakdowntypes-!e.graphioally presented in Figure 3.
The ettect 01' granular sizt!LlUld rate ot herbioidal applioation on
the level 01' inj~ is aleQ,shown.
It is evident that there are no real ditterenoes among the
various granular preparations with regard to size or breakdown.
However, there is slight t~end toward more oo~ inj~ with the
higher rates 01' 2,4-D. Although not shown, the amine gave slightly
more injury than the ester tormUlation.
In Figure 4 the effect ofpartiole size, breakdown type, and
rate 01' herbioidal appl1oa~on'on the oornyields is illustrated.
'The yield presented tor the liquid tormulation is an average ot
the amine and ester and the two rates 01' 2A·~D. The ditterences
among the various treatments w~re not statistioally signitioant.
Notwithstand1ngthis laok ot sign1tioance~there is an interesti~
trend toward higher yields with the 24/48 size g~anUle at the Ii
pound rate. Although not r~resented in this tigure, the ester
tormulation resulted in higher average yields than the amines.
Generally the yields obtained with the liquids were higher than
those with the granular treatments, but again the ditterenoe was
not signiticant.
The poor weed oontrol ob~erved (in certain cases) with the
20/35 size may have been a~trtbutable to the smaller number 01'
partioles per unit area with this granule size. The same amount
01' herbioide was applied per unit area with all granular sizes;
however, the 20/35 granUla;-has a~prox1ma~+y t as many particles
per given area as the 30/60~~ze (4). Thus' with the larger size
particle the herbicide distribution would be t that 01' the 30/60
size. It oould very well be that the 30/60 size particles would
be subjeot to taster disintegration than the larger sizes. Theretore,
accounting tor the lower control with this size.
Notwithstanding that oertain trends toward greater weed oontrol
and/or corn injury ettected by the various granular carriers
were not statistically signitioant, it is believed that with lower
rates 01' herbicidal applioation these trend,s, would be more clearly
demonstrated. AS was evidenced in this stu~, many expressions
were masked at the high rate 01' herbicidal application. These expressions
should be more pronounced at rates lower than the It
pound rate used in this study.
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