Raising seedlings is the last step in cultivating seedlings. The work of raising seedlings directly affects the quality of seedlings, afforestation and establishment of plants, survival rate, growth and results after planting. When lifting, you should pay attention to the following questions:
The standard seedlings of the nursery stock are robust and mature, and their buds are full; roots are full of roots; there are no pests and diseases. Seedling height should meet certain requirements such as Populus tomentosa, hybrid poplar, and Phyllostachys pubescens seedlings should be above 3 cm seedling height above 3.5 meters; Apple, pear, apricot, peach and other seedling height above 1 meter. Try not to use young seedlings, etc.
To grasp the timing of raising seedlings in principle, the seedlings must be in the dormant period of seedlings. Deciduous tree species can be raised before the defoliation begins in the fall and before the sap begins to flow in the spring of the following year. The evergreen tree species can be raised in the rainy season in addition to the above time. It is better to start seedlings in the spring before the seedlings begin to germinate. If seedlings are raised after the shoots open, the survival rate of the seedlings will be greatly reduced; in the autumn, after the growth of the shoots and leaves of the seedlings ceases, the roots can continue to grow and rise. Timely planting Hunchun can start growing earlier.
Mastering the method of explanting should be minimized when the seedlings are rooted. Seedlings from the main roots of digging seedlings are kept at least 20 cm in length to prevent damage to the seedling cortex and shoots. In case of dry weather, water should be poured first before loosening the soil. For too long main roots and lateral roots inconvenient to cut can be cut off avoid seedlings to avoid tearing seedlings affect the survival.
When digging seedlings should be brought up with soil ball roots should pay attention to bring the earth ball ball diameter can be 6 times to 12 times the diameter of the ground to avoid root exposure to the air to lose moisture. Bare root seedlings should be followed by planting; precious trees or trees can also be wrapped with straw ropes to prevent earth balls from falling off. At the same time, the roots and roots close to the roots can restore the absorption function quickly to increase the survival rate; the seedlings that need long-distance transportation must be rooted. Mud is covered with a plastic sheet or wet grass bag and transported.
Seedling disinfection is a sterilization method. That is, 3 to 5 Baume degrees lime sulfur soaking seedlings for 10 minutes to 20 minutes or 1:2: 100 Bordeaux mixture seedlings for 10 minutes to 20 minutes and then rinse with water. The second is pesticide application. That is, 50% methyl 1605 500 times liquid soaking seedlings for 20 minutes can kill the pests.
Good seedlings should be graded seedlings classification principle is essential pure varieties, rootstock types consistent with the upper part of the branches full of buds full of a certain degree of height and thickness of the roots developed, more roots, less root cut off serious pests and diseases and damage to the graft mold graft good healing Conifer species also need to consider the development of the top bud. Graded seedlings at each level were individually tied into 20 or 50 and 100 strains for ease of statistics, sale, and transportation.
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