1. How to improve the graft survival rate of cucumber?
Answer: Cucumber grafting is a key measure for wintering cucumber cultivation. Taking a widely used connection as an example, cucumbers are sown first, and pumpkins are sown after 5-7 days. When the first true leaf of the pumpkin begins to unfold, the cucumber cotyledons are just suitable for grafting. The rootstock seedlings and scions were excavated from the seedling trays. The growth points of the rootstocks were first cut with a razor blade. A blade was cut at a 35-40 degree angle below the cotyledon and on the side perpendicular to the growth direction of the cotyledons, and the depth reached the hypocotyl transverse diameter. At 2/3, the cut length is about 1 cm. Cucumber seedlings incline at 25-30 degrees 1 cm below the cotyledon, reaching 1/2-2/3 of the embryonic axis, and the incision length is about 1 cm. Accurately and quickly insert the cuts of cucumbers and rootstocks together and secure them with plastic clips. The cotyledon of the grafted rootstock is crossed with the cotyledons of the scion cucumbers. After grafting, the grafted seedlings were planted in nutrient bowls. Grafting edge of the grafted seedlings neatly discharged into the seedbed, while filling with fine soil between the gaps, while irrigation, edge cover film, and finally covered a small arch shed, shaded with grasshoppers during the day. After 3 days of grafting, the seedbed was kept free of air. The temperature of the seedbed kept 25°C-28°C during the day and 18°C-20°C during the night; the air humidity was kept above 90%. After 3 days, depending on the degree of wilting, the seedlings were given a small amount of air release, and the amount of ventilation was later increased. After healing the interface in one week, the grasshoppers can be gradually removed, and they begin to exhale and remove the roots in time. The bed temperature is 22°C to 26°C during the day and 13°C to 16°C at night. If the bed temperature is lower than 13 °C at night, cover grasshoppers. Seedling watering within 1 to 2 times. If a cloudy day is encountered during grafting, or if a new species is grafted, the healing of the wound or the affinity will have a certain effect. After the root is cut off, it is easy to snoring or die. Therefore, in the afternoon of the first two days of cutting roots, the cucumber roots (under the fractures) can be pinched by hand to form wounds. If the leaves of cucumber plants do not fight, the young roots of the cucumbers can be cut every other day. Before the treatment, spray 60% Baitai 1500 times once, and after 2 to 3 days, the root can be planted.
2. How to improve the survival rate of shed seedlings after the colonization of shed and foggy days?
Answer: Every year in the middle and late October, there will be 3-5 days of cloudy, rainy, foggy days, so that crops such as cucumbers, tomatoes, and peppers that have been cultivated cannot be planted in time, resulting in a long seedling growth. After years of practice, the seedlings of melons and eggplants are not easy to grow too long, otherwise they will not grow well after being planted. For timely colonization, ridges or spasms can be prepared in advance, pouring small water or pouring dark water when planting on cloudy, rainy or foggy days, or not sealing the holes when planting, and filling 15% of hymexazol every 3 to 5 days. 500 times the liquid, or 20% methyl-tocopherol 1200 times plus 20% US-plus rich (Amysida) 1500 times, until the sunny day after pouring a water, and timely scratching the hole or ridge. If it is sunny and sunny on a continuous cloudy day, it is necessary to ventilate it at a temperature of 24°C in the greenhouse. As the temperature rises, the plants appear to shade the flowers appropriately, or spray the leaf surface fertilizer on the plants. Doubled, the purpose is to increase air humidity and reduce the impact of high temperature transpiration on the crop.