Cultivating the seedlings is an essential means of improving the economic efficiency of the maple-saplings industry。
1. The soil is in the best state before seedlings are sowed in a year, during the seeding period and even during the nursery period, and is generally not suitable for irrigation, and it is critical to prevent soil sheeting. After the heavy rains, it's time to lighten the ground. The number of plants per hectare should not exceed 300,000。
2. Cultivation of saplings shall be carried out for a year after the fall of leaves or before the spring gestation, at a distance of 30 cm x 50 cm; if a saping bed is to be planted, the sprouts shall be removed。
Iii. The multi-year seedlings are sprouts once a year in the bud, premature sprouts are not easily erased, and too many tree nutrients are consumed late. Erase all buds in the bottom 1 to 3 pairs of buds, avoid creating a competition branch, enhance the top edge, and develop the bud into a central leadership branch and promote high growth. The frozen dead must be removed in a timely manner, and a top sprouts must be preserved and removed. The remaining side buds are staggered at different angles, leaving a side bud on each section to erase them, and the remaining side buds develop into supplementary branches, which facilitate ventilation and light, enhance light co-operation and accelerate runoff growth。
Cuts shall be made to maintain tree canopy heights above 2/3 tree heights in order to balance the tree body and prevent inversion. For three years, saplings are cut from the side branch within one third of the tree height of the main stem before they are sprouts; the side branch and the top branch remain sprung in the manner described above to promote growth。
Irrespective of whether seedlings were planted in that year, or in the years in which they were produced or transferred, they were followed up with ammonia in mid-may and in the first half of the sixth, seventh and eighth months prior to the onset of the rapid birth period, after which they were filled in a timely manner in accordance with soil conditions. Fertilisation is controlled throughout the year at 750 kg/hm2-1500 kg/hm2, with the last three seizures accounting for 90% of the year. It is not advisable to pursue fatting after late august in order to prevent any impact on woody forestation。
(municipal forest science institute contribution)
