Advantages of grading
Grading of onion sets has multiple advantages:
- Large degree of uniformity.
- In the larger size up to 20% increase in production.
- Maximum control is possible on desired grading of final product.
- Maximum control is possible on desired earliness of final product.
Please keep in mind that the large size sets (21-24mm) are more susceptible to bolting.
The earliness of the various size classes can vary by up to 6 days. The larger the onion sets, the earlier maturing it is. A second determining factor is the planting density.
Graded sizes and earliness
Graded sizes and size of end product
For the same planting density and growth period, larger onion sets produce a larger end product. However, the smaller size has a longer growing period and by the final grading can be almost as large as the larger size class.
Harvest second year product