How to deal with high yield of seed potato?

The related treatment of seed potato before sowing is not only conducive to the early emergence of strong seedlings, but also effectively control the occurrence of seed-borne and soil-borne diseases, which is one of the important links to obtain high quality and high yield of potato. So how to deal with the high yield of seed potato?

1. Seed drying

Potatoes generally need to prepare 125-150 kg per mu. Drying seeds before sowing can promote potato to release dormancy period and promote seed potato to sprout neatly. Choose a sunny day, put the selected seed potatoes in the sun at a temperature of 12-15 ℃, dry the seeds for 2-3 days, and then cut into pieces according to the size of the potatoes to accelerate germination. During the drying period, the seed potato should be turned once a day to make the seed potato evenly visible, and in the process of turning, the rotten potato, soft black rot diseased potato, deformed potato and frostbitten potato should be removed.

2. Seed potato sprouting

Accelerating germination before sowing can promote the early emergence of potato and advance the growth period of potato by 7-10 days, which is not only an important measure for early listing of potato in spring, but also helps to avoid the harm of high temperature and aphids in the later stage, and is the key technology of potato production in spring. The time of sprouting is generally about 25 days before the suitable sowing time of local potato.

(1) time of slicing

It is suitable for 1-2 days before budding. If you cut the pieces too early, it is easy to cause too much water loss or rotten seeds.

(2) tool disinfection

In order to prevent the human transmission of the disease, two knives need to be prepared and sterilized in 75% alcohol or 0.5% potassium permanganate solution before cutting. Take turns. Especially when cutting sick or rotten potatoes, you need to stop immediately, invade the knife into the configured disinfectant for disinfection, and then use another knife to cut again to prevent the spread of disease in the process of cutting.

(3) the method of cutting blocks

Due to the slow germination of the tail bud of the potato, the yield of the adult potato is very low, only 1/3 of that of the top bud. Therefore, when the potato is cut into pieces, the tail bud should be removed. The size of the cut pieces should be uniform, generally 25x 30g each, and each piece should retain at least one sound bud hole. The seed pieces are cut and spread out to dry in the leeward to the sun to promote wound healing.

(4) seed dressing

In order to avoid the infection of germs in the knife edge of potato and prevent the occurrence of diseases in seedling stage, it is best to choose high-quality seed coating agent to mix seeds. Spraying bright shield 100ml or Shile 100ml or Maishuping 50ml on 150kg seed potato with 1.5L water, then mixing well can prevent the occurrence of seedling diseases such as black mole disease, and can make the potato sprout early and sprout strong.

(5) sprouting

After the mixed seed pieces are put into the basket to dry, you can use the arch shed or heating the sunny bed to promote germination. When sprouting, each layer of potato is sprinkled with a layer of wet sand, which can be covered with 3-5 layers of potato, and finally covered with grass or felt cloth to moisturize. During the budding process, keep the temperature at 18-22 ℃. When the bud grows to about 1cm or so, dry it under scattered light so that it can see light evenly, and when the bud turns green, you can prepare to sow.

3. Chemical spray ditch

When sowing, after ditching and sowing, spray 15-30kg water ditch with Amicida 100ml per mu, cool slightly and then cover the soil. It can better prevent the occurrence of diseases such as black mole and powder scab, and improve the quality of potato chips.