How to select silkworm seeds? What are the methods of raising seedlings?

Friends living in the countryside probably know that the grass stone silkworm bar, it is a weed growing in the field, the fruit can be cooked to eat, but also high nutritional value, now many people begin to plant. How to choose the seeds of Bombyx mori? What are the methods of raising seedlings? The following let the editor to tell you!

First, how to select the seeds of grass stone silkworm?

When we choose grass stone silkworm seeds, we should choose round seeds that are full and free of insect pests, preferably the new seeds of the same year, so that the germination rate is relatively high, and it is more secure to buy them in the local special seed store.

Second, what are the breeding methods of Bombyx mori?

1. Soil preparation and fertilization

The grass and stone silkworm has a shallow root system, is not resistant to high temperature and drought, likes shade and frost, and likes fertilizer and waterlogging, so sporadic planting should choose corner of the wall, behind the house, between buildings or shady places. Large-scale planting should try to choose gully dam land, back-shaded gentle slope land or intercropping land, thick soil layer, loose and fertile, drought-tolerant sandy soil or soil land, drainage should be good. This kind of land planting grass stone silkworm has high yield and good quality. Before planting, combined with ploughing and ploughing, the amount of rotten farm manure and phosphate fertilizer is about 1 500 ~ 2000 kg per mu and 30 kg per mu, and the amount of fertilizer can be increased appropriately in the plots with poor soil viscosity or fertility. Then use a rotary tiller to turn deeply and make ridges to facilitate drainage. It is usually made into low ridges.

2. Seedling and sowing

Before and after the final frost in spring, when the temperature rises to 8: 10 ℃, seedlings can be raised and sown. Before sowing, it is necessary to strengthen seed selection, constantly rejuvenate and renew, and maintain its excellent seed character. Northern Shaanxi is generally carried out from mid-late March to early April. The high fertility sandy loam was selected as the seedbed according to the width of 1.2 m. The number and length of the seedbed were determined according to the needs and plots. Leave 60 cm between the seedbeds for easy management. The seedling bed was fine and flat, and the seeds were sown according to the specification of row spacing of 15 cm and plant spacing of 10 cm. One tuber was sown in each hole and the thickness of covering soil was 6-8 cm. The number of seedlings per mu is calculated according to the amount of 7000 seedlings, and the amount of seeds used per mu is about 20 kg. Direct seeding production can be planted according to the specifications of row spacing 40 cm, plant spacing 25 cm, depth 8 cm, 1 / 2 tubers per hole, and 5% of the number of plants per mu to prevent seedling replenishment. Attention should be paid to proper watering at the seedling stage to keep the ground dry and wet, and timely drainage in the rainy season to prevent flooding. Strengthen management, pull out weeds at any time to ensure strong seedlings. When the supply and demand of seedlings is tight, it can be propagated by cutting method. In spring, using plastic arch shed, the cutting seedlings of Bombyx mori can take root about 20 days after cutting and can be planted in 30-40 days.

3. Timely transplanting

When raising and planting seedlings, the seedlings can be transferred and planted when the seedlings grow to about 20 cm. About 6000 plants were planted per mu with a plant spacing of 25 cm and a row spacing of 40 cm. 1 plant per hole, transplanting with soil block, watering enough planting water, planting depth equal to soil dunes. For intercropping with tall stalk crops, 3 000 to 4 000 plants per mu were planted.

4. Post-planting management

In the early stage of growth, pay attention to ploughing and weeding. From 7 ~ 10 cm of seedling height to before flowering, topdressing with watering for 1 ~ 2 times, urea 10 ~ 20 kg per mu, or human feces and urine 400 ~ 500 kg per mu. Enter the vigorous flowering period, the stolon spreads around, at this time can no longer carry on the ploughing, in order to reduce the damage to the stolon, according to the weed situation at any time to pull out, to prevent the grass from pressing seedlings. When the flower buds appear, the flower buds and terminal buds can be removed to prevent lodging, inhibit the growth of stems and leaves, save nutrients and promote the growth and development of underground tubers. In order to facilitate the development of underground tubers, the aboveground stems and leaves were properly sprayed and regulated when the aboveground stems and leaves were overgrown. In case of continuous high temperature and drought weather, watering and cooling, drought resistance and seedling protection. Proper spraying of potassium dihydrogen phosphate at seedling stage inhibited the plant height of Bombyx mori at seedling stage, but promoted the increase of underground tuber thickness, fresh tuber quality and the number of underground tubers per hole. The spraying concentration of potassium dihydrogen phosphate is generally about 400 times, and it can be sprayed for 2 times during the whole growth period. Remove the stagnant water of rainstorm in time to prevent the occurrence of rot caused by stagnant water.

Well, that's all the editor wants to share with you. If you also plan to plant grass and stone silkworms, remember to choose high-quality seeds to sow. In addition, you can learn from some of the breeding methods mentioned above. I hope this article can help you.

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