Duratech HAYBUSTER 107C DRILL, Operating Instructions And Parts Manual

Page: 49 / 166

41 7 7 C / 1 0 7 C D R I L L S O P E R A T I N G I N S T R U C T I O N S
To obtain the desired seeding rate of the chaffy native
grasses it may be necessary to adjust the feed shaft speed.
The charts on page 32 list the sprocket combinations and
relative speed in revolutions per acre. Use these charts as
a guideline in choosing the correct sprocket combinations.
On a standard drill box, sprocket A has 14 teeth and
sprocket B has 18 teeth. There are 12 tooth and 24 tooth
sprocket included in the shipping kit for the native grass
attachment.
5.5 Pure Live Seed Calculations
Any sample of bulk seed always has a certain percentage of non-viable seed and inert matter. In cereal grains, this
percentage is quite small and can usually be ignored when determining seeding rates. Grass seeds can have a very
high percentage of dormant and non-viable seed, and inert matter. These high percentages must be considered when
determining grass seeding rates.
For example: You wish to plant Big Bluestem (Chart pg 32) at a rate of 12 ponds of pure live seed (pls) per acre.
A typical grass seed tag might appear as follows:
Big Bluestem
Weed seed……………..0.10% Lot No………….83101
Noxious weed seed…….0.00% Germ……………52.0%
Other crops…………….0.05% Date of test………3-86
Inert matter……………40.05% Grown…………Kansas
Step 1. Determine the total percentage of inert matter from the seed tag
Weed seed 0.10%
Noxious weed seed 0.00%
Other crops 0.05%
Inert matter 40.05%
40.20%
Step 2. Subtract the percentage of inert matter from 100% to find pure seed percentage.
100.0% - 40.20% = 59.80%
Step 3. Divide the pounds of pure live seed desired by the percent pure seed.
12 lbs pls/0.5980= 20.07 lbs pure seed