Seed walnut seeds should be selected for strong adaptability, high yield, stable yield, shell dew, seed enrichment, easy access to kernels, high seedling rate and oil content, strong growth, and good plants from 20 to 30 years old as seed collection. Mother tree. Generally harvested in early September (Bai Lu), the mature mark of walnut seed is: it should be yellowed from green in outer exocarp and harvested when there is 50% cracking. If the seeds are harvested too early (early harvest in early September), the seedling emergence rate will be less than 50% after sowing; the seeds harvested at the end of September will have a seedling emergence rate as high as 90%. Walnuts used for planting should be harvested from the outside and middle and upper parts of the canopy. Because the seeds collected in this area are well lit and well developed, the seeds are full and their germination power is strong. Do not use pod fruit as seeds.
After walnuts are harvested, they can be accumulated in the room for 3 to 5 days when the peeling is not easy, and the thickness is 0.3 to 0.5 meters. The peeled seeds should not be washed with water and dried in a dry and ventilated place. Usually after 7-8 days, the membranes of the nuts should be dried until the diaphragm of the nuts is broken. The seed coat and the seed kernels are not easy to separate. When the color of the seed kernels is consistent inside and outside, it is dry. Transparent signs can be collected. The dried seeds are placed in sacks and stacked in a ventilated, cool, dry room where light cannot be directly injected. During storage should always check to avoid rodent damage and mildew, fever and other phenomena. When the number of seeds is small, they can be put into a cloth bag and hung in a cool and ventilated room or under a shed.
The dormancy period of walnut seedlings and wild walnut seedlings is very long and should be stratified and collected after collection. The specific method of the sand reservoir is: the general pit depth is 0.7 to 1 meter, and the width is l to 1.5 meters. The length is determined by the storage amount. The bottom of the pit is first paved with 1 layer of wet sand, about 10 cm in thickness, topped with 1 layer of walnut, and then covered with 1 layer of wet sand about 10 cm thick, so that the layers are buried, and when the pit is between l0 and 20 cm, the wet sand is covered. The ground is flat and the soil is ridged. Seeds buried in wet sand can be greenish or used for planting. However, when dry sand species are used, they should be soaked in cold water for 2 to 3 days and then buried. Seeds that have just peeled off the green can not be soaked when buried. The seeds stored in the wet sand are neat and seedling and robust. However, if the humidity is not good enough, the seeds are easily rotted and should be checked carefully.
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