First, the cultivation of rootstock seedlings
1, fine to do seedbeds. In the nursery, sandy soils with shady lee, loose soil, organic matter, medium fertility, fertilizer retention, and good water retention performance should be selected. About half a month before sowing (mid-mid-May), appropriate compost, compost, pig manure or 50 kg of compound fertilizer per acre was used as a base fertilizer. Then the soil is plowed and the soil is finely smashed. Each rake is 1.2 meters wide and 30 meters long. Sites with underground pests should use carbofuran for soil disinfection prior to site preparation to kill underground pests.
2, sowing. The seed does not have a dormant period. Before sowing, it is necessary to screen the quail nucleus, remove small, abnormally growing alfalfa seeds, and use the seeds with large pods to wash and dry before planting. The sowing date is from late May to early June. There are two kinds of sowing methods, sowing or drilling (usually drilled). Drilling distance 20-25 cm, spacing 10-12 cm, depending on the seed germination rate, seeds 1-3 seeds per hole, sowing light pressure, the seed half pressed into the soil, a thin layer of fine lime soil to Seed is not a degree. If sowing is too deep, it will be difficult to unearth and it will cause mildew. If it is too shallow, it will not take root. Immediately after sowing, the seedbed should be irrigated with water and covered with a moisturizing material such as rice straw or fresh pigweed thinly on the surface of the soil so as to keep the surface of the soil from being compacted and facilitate the emergence of seedlings.
3, after the broadcast management. Before the seedlings are unearthed, the seedbeds must maintain a certain humidity, do not get too wet and dry, and remove the grass cover after emergence. As the seedlings are shaded, they are easily burned when exposed to intense sunlight. Therefore, before emergence, it is necessary to use a shade net to build a shade shed 50 to 60 centimeters high. After the seedlings were established, the weak seedlings, the dense seedlings and the diseased seedlings were sparsely removed, leaving a strong seedling according to the size of the plant. When the seedlings grow 3-4 leaves, they can be applied once every half month with thin human excrement or compound fertilizer, and the weeds can be promptly removed. When the seedling height reaches 20 cm, remove the top 1-2 leaves, promote the thickening of the lower stem, and at the same time, prevent and treat pests and diseases. The shade net was removed at the end of August and early September. In the second year of spring, the diameter of rootstock seedlings can be grafted to 0.6 cm or more, and the standard transplantable re-incubation management can not be achieved until the following year.
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