First, durian seeds should be fresh. If the seeds are stored for more than 7 days without special treatment, such durian seeds will lose their vitality, resulting in a decrease in germination rate.
How to identify the vigor of durian seeds can be carried out by simple red ink method.
Soak the seeds for several hours, gently peel off the seed coat with sharp tools to avoid hurting the seeds inside, soak them in 5% red ink for 20 minutes, then take them out and wash them with clear water. If the dyed seeds are red, it means that there is no life and it is difficult to germinate.
Second, the sowing method durian is suitable for sowing in spring (March-May). First, soak the seeds in warm water at 40~60℃ for 5~6 hours, and the seeds will absorb enough water and germinate faster.
During this period, a small container was selected and filled with fermented compost, soil and sawn timber according to the ratio of1:1as the substrate for durian seedling growth. The container should have good drainage function. Because of the large water demand in the early stage, it is necessary to water frequently, but there can be no water accumulation.
Take out the soaked seeds, dry them, and then put them in the soil. If there are many seeds, pay attention to leave gaps and cover them with a thin layer of soil about 3 cm thick.
In the stage of waiting for germination, in order to keep the soil moist, plastic film can be used to cover the soil to keep it moist and warm. It takes about 14~28 days for durian seeds to germinate. The early growth of durian seedlings is relatively slow, which is related to the nature, fertility and surrounding climate of loam. Generally speaking, the soil is fertile, the ground temperature is 20~28℃, and the seed germination time is faster.
After the seeds germinate, some people will make the wrong choice. They put the seedlings in direct sunlight, thinking that durian is a pure tropical fruit tree and needs enough sunshine to grow longer.
But in fact, seedlings less than one year old are prone to dehydration and death after a long period of direct sunlight. Because their roots have low water absorption capacity during this period, long-term exposure to the sun will lead to better water consumption and the water in the roots will not be supplied in time, so durian seedlings are not suitable for direct exposure to strong sunlight and should be properly covered. Especially between noon 1 1 ~3. Under the long-term scorching sun, it is not only easy to wither, but also grows more slowly.
When durian seedlings grow to about 50cm, we can pay attention to their planting in the field: dig 80x80x80cm, 80cm in length, width and depth, or both 1m for replanting. When excavating, separate the first 3/4 of the excavated soil from the bottom, and keep the first 3/4 of the excavated soil for later use.
Prepare 20kg organic fertilizer and 50g NPK NPK fertilizer, mix them with 3/4 excavated soil and stir them until they are evenly distributed. After stirring evenly, push it into the dug hole and pour water to decompose the fertilizer components normally. Leave it for 2 weeks and prepare to plant durian seedlings. You can plant it when the time is up.
As for the remaining excavated soil, it can be used to cover the soil layer near the planting after planting. The purpose is to cover the surrounding soil, so that weeds are not easy to grow, because there are no weeds seeds and roots in the bottom soil, so it takes a long time to grow grass.
Durian should be fertilized regularly before fruiting, in addition to applying base fertilizer once a year, so as to provide sufficient nutrients and promote its rapid growth. The fertilizer given at this time is NPK fertilizer, which is applied to durian once every 3 ~ 4 months. Fertilization should be carried out in the open-loop ditch outside the crown to prevent seedling burning.
Conclusion: Although fresh durian seeds can generally germinate, in order to cultivate stronger durian seedlings, it is usually necessary to pick those full seeds, so that the seedlings grown from such seeds will be healthier. Durian in seedling stage needs to pay attention to two management, one is sun protection in summer, and the other is antifreeze in winter. Durian is a tropical fruit tree, and low temperature will limit its growth. If there is frost in winter, it is not suitable for planting durian.