PSB Sp 21 Sweet Potato (UPL Sp 10): Yield, Maturity and Characteristics
PSB Sp 21 is a registered sweet potato variety, also sold or known as UPL Sp 10. It was registered with the National Seed Industry Council in 1997 as NSIC 1997 Sp 21. Its record notes 13.4 tonnes per hectare on average in the trials.
The average and top yields in tonnes per hectare come from the trials each variety went through to be registered with the NSIC, and from what the seed companies say about their own seed.
What farmers harvest today can be different. Newer harvest records, the season, the place, the soil, the water and the care all move these numbers over time.
So use them to compare varieties, not as a promise for your field. Ask your seller or your agriculturist how the variety did on farms near you in the last few seasons.
If you came here looking for UPL Sp 10, this is the same sweet potato. Compare it with the others in our sweet potato variety finder, or see every crop variety we list. For the crop itself, read our guide: Land preparation for root crops.
- Yield: 13.4 tonnes per hectare on average in the trials.
- Recommended for: anywhere in the country.
Key facts about PSB Sp 21 sweet potato
| Trait | What the record shows |
|---|---|
| Registration | NSIC 1997 Sp 21 |
| Year approved | 1997 |
| Also known as | UPL Sp 10 |
| Average yield | 13.4 t/ha |
| Recommended area | Anywhere in the country |
| Dry matter content | 30.5 |
| Starch content | 52.3 |
| Flesh color | Cream |
| Root shape | Elliptical |
| Skin color | Pink |
How long does it take, and how much does it yield?
Its average yield of 13.4 t/ha trails the average of its group, 15.15. Trial yields come from well managed plots, so your own will depend on water, fertilizer, pests and timing.
Once you know the day count, anee.io dates every task from each lot's own planting day, with the growth stages and weather beside it.
Is it resistant to pests and diseases?
| Pest or disease | Rating | What it means |
|---|---|---|
| Scab | Resistant | Held up well |
| Weevil | Resistant | Held up well |
It showed no weak spot in the ratings on record. Still, a resistant variety can break down when a new strain or pest population comes, so keep scouting.
The pests and diseases that hit sweet potato fields most often: root knot nematode. Our pest finder and disease finder help you name what you see.
What the root is like
Its roots have cream flesh and pink skin. Dry matter is 30.5 percent. A higher dry matter cooks mealy and gives processors more flour or starch from each tonne. The starch content is 52.3 percent.
Where and when to plant PSB Sp 21 sweet potato
It is recommended for anywhere in the country. Pick by use and market: yellow or orange flesh for snacks and fries, purple for processing, white for boiling. Weevils are the main enemy, so plant clean cuttings and harvest on time.
Before you buy seed
- Buy sealed packs or tagged sacks from an accredited dealer, and check the packing date and germination rate.
- Ask your municipal agriculturist or nearby farmers how it did in your area last season.
- Try it on a small area first, beside the variety you usually plant, before you switch the whole farm.
- Write down the planting day, inputs and harvest, so you can compare varieties on your own ground. anee.io keeps these records for you.
Set the planting day of each lot and anee.io dates every task to harvest, with the weather beside it. Free on the Libre plan.
Start freeSweet potato varieties like this one
These are the closest matches among the sweet potato varieties we list. So if seed of this one is hard to find, compare these first.
- SG 94 17 17: about 120 days, 13 t/ha, 2000
- JK 018: 11.68 t/ha, 2002
- LG 19A 10: 100 to 120 days, 11.08 t/ha, 1997
- JK 027: 13.42 t/ha, 2004
Is UPL Sp 10 the same as PSB Sp 21?
What is its yield?
Where does it grow best?
Where can I buy seed of PSB Sp 21?
See how PSB Sp 21 will do on your farm
With Libre + Anee, see its full record: how it yields, its strengths and weaknesses against pests, diseases and the weather, and whether it fits your farm, your season and your soil.
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