The success and failure of the sweet potato harvest were easy to understand.
9/7, 2022 Trial harvesting, but there were no potatoes at all
Possible cause
・It rained for a long time, so it rained for almost a month in August.
Sweet potatoes grow without watering
Because you don't like humidity?
・The temperature was low
Due to the long rains, the temperature in August continued to be quite low at 20 to 25 degrees.
Sweet potato is a crop that is suitable for the temperature of the southern country born in Kagoshima. I don't think I've ever had a temperature as low as this year in the summer when 35 degrees has been commonplace so far.
- No additional fertilizer
The base fertilizer was the same as the basics, and no additional fertilizer was given.
If you add a lot of additional fertilizer, the plants will become sluggish and only the leaves will grow and the fruits will not grow.
If you give it, use a fertilizer with a lot of potassium that works for the roots
(Sweet potato fertilizer is sold commercially.)
Among natural materials, plant ash contains a lot of potash.
It is NG to have a lot of nitrogen such as oil residue
Come to think of it, last year (2021) the potatoes I grew with normal cultivation were very small due to poor harvests.
Is it because of the record rain last year? ?
However, in the same year, sweet potatoes grown without plowing and without fertilizer grew large and produced a bountiful harvest.
As sweet potatoes grow larger, they become less sweet and less delicious.
The timing of harvest is while trial digging
I'll ask how things are going.
Estimated harvest
・Harvest 4-5 months after planting
before the frost
Sweet potatoes are vulnerable to cold and easily spoiled
When the leaves wither and turn yellow
2022 10/20 When I harvested this, it grew to just the right size and thickness.
⭐️ Silk Suite planted on the west side
Ideal shape thickness length
⭐️ Beni Haruka planted in the middle
Many were thin and skinny
⭐️ Silk Suite Planted on the east side (mountain side)
Overall pretty good
Round and thick but short, although many are small
Overall good feeling
Harvest usually in 4-5 months.
We planted in early to mid-May and harvested in late October.
Harvested in just over 5 months.
🔴Why was the potato thin in the middle?
・Because the red haruka variety is different?
・The width between the ridges was narrow and the vines could not grow.
What is the reason for the failure of photosynthesis?
From now on
Do you want to plant in two rows?
Widen the width between furrows (minimum 90cm)
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