Walnut seedlings directly propagated by seeds are called seedlings; Grafted seedlings are called grafted
Walnut seedlings directly propagated by seeds are called seedlings; Grafted seedlings are called grafted seedlings. So, which is better, walnut seedlings or grafted seedlings? How are walnut seedlings cultivated? Let's talk about this problem.
First, is walnut seedling better or grafted seedling better?
Seedlings grown from seeds are called seedlings, branches or buds of a certain variety are connected with branches or roots of another plant, and seedlings grown after the interface heals are called grafted seedlings.
As far as output value is concerned, grafted seedlings must be seedlings, grow fast and bloom early; Grafted seedlings, especially wild seedlings, have stronger resistance and adaptability to adverse environmental conditions, more vigorous growth and longer life.
When introducing rare varieties, grafting propagation can also greatly save propagation materials and improve seedling yield.
Second, how are walnut seedlings bred?
1. Selection of walnut nursery land The nursery land of walnut should be selected in a place with flat terrain, sunny leeward, loose soil and good irrigation and drainage conditions.
When raising seedlings on flat slopes, attention should be paid to the slope potential and direction, and horizontal terraces are suitable. When choosing nursery land, we should try to choose a place near the planting area, near the grafting nursery and with convenient transportation.
2, soil preparation and fertilization methods Nursery land should be deeply ploughed or deeply ploughed in the autumn and winter of the previous year, with a depth of about 30 cm. Combined with ploughing, 2000-4000 kilograms of organic fertilizer should be applied every 667 square meters, and enough frozen water should be poured. Before sowing in spring, turn it shallow again, and then rake it flat to make the border, the width of which is 1 m and the length is 5-10/m. seed treatment
3. Walnut seed treatment method Seeds that have not been treated by wet sand stratification should be soaked before sowing in spring. Commonly used methods are:
(1) Soak the seeds in warm water. Immerse the seeds in a pot of warm water at 80℃, and then stir with a wooden stick. After natural cooling to normal temperature, soak for 8- 10 days, and change water every day. After the seeds burst, take them out and sow them.
(2) Soak the seeds in cold water. Soak the seeds in cold water for 7- 10 days, change the water 1 time every day, and be careful not to let the seeds float; Or put the seeds into sacks and press them into running water such as rivers and canals, and sow them after they absorb water and burst.
(3) soaking the seeds with lime water. Soak walnut seeds with 10% quicklime water, press walnuts with stones and other things to prevent them from floating, stir them 2-3 times a day without changing the water, and take out the seeds for sowing in about 10 days.
4. The sowing date of walnut seeds should be (1). The northern region is cold and dry in winter, and it is easy to be harmed by birds and animals after sowing. It is advisable to sow walnuts from late March to early April after the soil thaws in early spring.
(2) Sowing method. Nursery seedlings are raised by drilling, with 3 rows per border, row spacing of 30 -40 cm, and plant spacing of 10- 15 cm. When sowing, we should pay attention to the placement method of seeds, the suture line of seeds is vertical to the ground, and the tip of seeds is biased to one side, so as to facilitate the emergence of seedlings.