Seedling raising technique of Cornus officinalis

I. seed treatment

From September to October, the mature seeds of Cornus officinalis were collected and washed with clean water. The water tank was filled with 2 portions of boiled water and 1 part of cold water. The water was loaded to the first two parts of the tank. The washed seeds were poured into the jar, stirred slightly, soaked for 24-48 hours, dried on the cement floor and turned 3-4 times a day. After drying, soak the seeds in 1 part of boiled water and 1 part of cold water for 24 hours and then take out to dry. When the seeds have 70-80% cracks, mix them with 5 times wet sand and store them in ditches. When the seeds mixed with wet sand are filled to 10 cm from the mouth of the ditch, the soil is about 10 cm thick. The seeds stored in sand can be sown in the following spring and March.

Second, nursery site selection

Sandy loam with flat terrain, irrigation and high fertility was selected, and 4000 kg of rotten organic fertilizer and 50 kg of urea were applied per mu. First spread fertilizer on the surface, and then plough and rake flat, according to the length of 30 meters (depending on the terrain), width 1.3 meters of the whole bed to be sown. Pay attention to keeping the working path and drainage ditch when preparing the soil. In the hilly area, it is best to choose the sloping land whose slope is not more than 15 °, and the slope in the mountain area is not more than 25 °, so as to make the nursery land convenient for irrigation, good drainage and good soil quality (pH value 5.66.8).

Third, sowing and seedling stage management

In mid-late March or early April, the seeds accelerated by sand storage were concentrated and sown in the prepared seedbed. Water the seeds before sowing, then spread the seeds evenly on the bed, cover the fine soil 2cm-3cm thick, and finally build an arch shed to cover the film. Sow 40-50 kg per mu. About 30 days after seedling emergence, ventilation and cooling should be made in time, so that the temperature in the greenhouse should not exceed 30 ℃. After the emergence of 4 true leaves, the seedlings were removed for 3-5 days and then transplanted, about 13000 plants per 666.7 square meters. When the seedlings are raised by direct seeding, the seedlings are fixed when the seedlings grow to the 6th true leaf, and the plant spacing is kept at 15-20 cm. Before the beginning of winter, pour frozen water once, and the next year when the seedling is about 70 cm high, it will be planted in the nursery before and after "the Spring Equinox".