Seed meter and venturi
Metering of the seed is done at the tanks. While metering in volume, the co-efficient of variation from opener to opener is just 2 percent at the feed wheel. The population rates are controlled by meter speed as opposed to varying the amount of meter flute exposure as on a box drill.
By using this method, population rates can be better controlled, resulting in lower amounts of population variance from meter to meter. That is better than any other volumetric metering system on the market today.
The 1990 Central Commodity System (CCS™) also features metering gates at each individual metering wheel. This allows the operator to set the seed gate based on the seed size and population rate, to allow for even greater control of the population rates. The meter gate can also be used to shut off seed flow to an individual seed meter if desired.
The 1990 CCS features three optional meter rollers:
The narrow black roller is recommended for low application rate crops such as sorghum.
The medium-rate black roller is used for application rates of up to 89.7 kg/ha (80 lb/acre).
The white high-rate roller is used for larger seeds and for high application rates. The white high-rate roller is also used for crops such as barley, oats and rice on 1990 CCS dual-rank models.
The metering rolls are interchangeable as well. Available metering bundles allow the operator to change over the complete meter assembly when changing crops from a high-rate crop to a lower population rate crop.
Meters are color coded for quick reference:
Low rates and small seeds (sorghum/milo only)
Medium rates to 80 lb/acre; medium and small size seeds (milo and wheat only)
High rates of wheat, barley, oats, rice, and large seeds (soybeans)
They can be easily removed or interchanged when changing over from seeding one crop to another.
Meter rolls are available from 18 port to 34 ports or nine rolls to 17 rolls per meter section.
Meter rollers are compatible with a wide variety of crops and rates.
IMPORTANT: 1990 CCS single-rank machines are compatible with soybeans, wheat, and milo. 1990 CCS dual-rank machines are compatible with soybeans, wheat, milo, barley, oats, and rice.
The 1990 CCS features an oscillating seed agitation system. The oscillating-style agitation system is more aggressive than a rotating style to be able to handle crops prone to bridging such as barley and rice.