12 rows seed roller has multiple types for small seeds such as rice, wheat, soybean, sorghum, silage corn, grass seeds, cover crops, granular fertilizers, etc. It works in the pneumatic seeder and mainly apply in agricultural machinery to save crop and cost, especially for seeding and fertilizing machine.

A seeding metering roller is a key component in agricultural planters that controls the precise rate and spacing of seeds or fertilizer as they are delivered, featuring different cell sizes (flutes) or spiral designs for various seed types, from fine seeds like canola (fine/extra fine rollers) to large crops like corn (coarse/extra coarse rollers) for consistent application, preventing pulsation and ensuring optimal yield

How they work?
Cellular Design: Rollers have pockets or "cells" that hold individual seeds as they rotate.
Singulation: As the roller turns, seeds are singulated (separated) into these cells.
Delivery: They are carried past through a hose and dropped into the ground opener at the correct spacing. 

Seed Roller Advantages:

Simple structure: The seeding roller has a simple design and structure, which is easy to maintain and change.

Miniaturization: Its small size helps to reduce the volume and weight of the overall equipment.

Reliable operation: It can stably perform intermittent motion to ensure the continuity and accuracy of the sowing process.

Higher mechanical efficiency: When transmitting power and performing sowing operations, there is less energy loss, which improves work efficiency.

Intermittent motion characteristics: It is suitable for intermittent seeding required by sowing operations and can control the frequency and quantity of seed placement.

Stability: It runs relatively smoothly, which helps to evenly spread the seeds. Although there is a certain pulsation, the sowing effect can be optimized through adjustment.