It is now harvesting season for local sweet potatoes. Sweet potato is a vegetative propagated vegetative body. There is no obvious standard of maturity and accurate harvesting time. However, sooner or later, the harvesting time has a certain influence on the yield, seed storage, storage, processing and utilization of the sweet potato and crop rotation.
Daozuo District Flea Market Township Agricultural Technician Shang Zeyong told the author that premature harvesting would significantly reduce the output of sweet potatoes, and it is not easy to leave high-quality seed potatoes; when the harvest is too late, sweet potatoes are vulnerable to weather such as low temperature and cold damage. , impatience storage, cut rate and the rate of powder will drop. Therefore, sweet potatoes must be harvested in a timely manner.
Digging time according to use
According to reports, harvesting and digging of sweet potatoes should be based on factors such as climatic conditions, safe storage time, and arrangement of the next crop. The ground temperature is around 18°C, sweet potato growth slows down, and weight increases little; ground temperature is around 15°C, sweet potato stops expanding; if ground temperature is below 9°C for a long time, sweet potato will suffer cold damage.
Shang Zeyong said that according to many years of experience, it is generally possible to begin digging sweet potatoes at 18°C ​​and harvest them before dry frost; to cut dry sweet potatoes for spring use or to sow land for growing sweet potato from winter wheat, generally harvesting Harvest; summer sweet potatoes reserved for planting are harvested before the frost falls; sweet potatoes stored for storage can be harvested later, but must be harvested before the frost.
Separate storage according to use
The soil is too dry or too wet, which is detrimental to sweet potato harvesting. Too dry, soil moisture content decreased, ground temperature changes, sweet potatoes vulnerable to cold damage, digging and planing soil is also more difficult; too wet, too much soil moisture, sweet potato water content, after harvest impatience storage, mining is not convenient .
Shang Zeyong said that when the soil is too wet, the sweet potato stalks should be cut off first, and after a few days of sun drying, the soil should be harvested when it is relatively dry. The summer sweet potatoes reserved for planting should be harvested in sunny mornings. After digging out, you can sunbathe in the fields first, and enter the pits in the afternoon of the same day. Do not spend the night in the ground so as not to suffer cold damage.
Shang Zeyong told the author that after the sweet potato is excavated, the potato can be selected first in the field, and the diseased, remnant and water-logged potato pieces can be removed and stored according to different uses and varieties. From the time of excavation to storage, the number of overturns should be reduced as much as possible, and attention should be paid to gently, lightly, gently, and lightly to avoid bumping the potatoes and adverse storage.
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