Yang Miao fast-growing period to strengthen and manage seedlings
In recent years, the area of ​​young seedlings has continued to increase. However, due to the fact that some seedlings are not strong and their diseases are serious, they often appear to have died after being planted. June-September is the rapid growth period of Italian poplar seedlings. This period of growth is the largest in the whole year. The key period of production should seize this key period to strengthen management and cultivate strong seedlings.
The fast-growing period of Dingzao weeding was divided into two stages, which were carried out at the height of 1 m and 2 m, respectively, and finally the number of seedlings per mu was less than 2,500. Weeds will compete with Yi Yang Miao to compete for water, and weeding should be done in accordance with the principle of “in addition to early, small, exceptâ€.
Scientific fertilization is mainly applied in the fast growing period, and it is usually applied 2-3 times. For the first time from late May to early June, 15-20 kg of urea was applied per mu. After rain was selected, it was distributed in sunny afternoons. The second time in the middle and late June, 30-40 kg of urea was applied per acre. The third time ended before the end of July, in order to facilitate the full lignification of Yi Yang Miao, 30 kg of urea per acre. After August, it is forbidden to apply nitrogenous fertilizer to Italian seedlings in order to prevent the seedlings from becoming leggy and not conducive to planting and survival.
Pest control (1) Leaf pests. The common leaf pests of Italian poplar seedlings are C. sibirica, C. sibirica, etc., and 20% of cypermethrin EC 2500 times, 2.5% of deltamethrin EC 2500 times should be sprayed during the peak period of 2-3 instar larvae. Pesticide control requires uniform and thoughtful spray. (2) Diseases. One is poplar canker disease. In May-August, Chlorothalonil, carbendazim, thiophanate-methyl, and other drugs were regularly sprayed on Populus lycopersicum, once every 10-15 days, for 3-4 consecutive times. The second is leaf rust. From July to September, it was found that there was powdered rust on the leaves of poplars for spraying and control, and triadimefon, for example, was applied once every 15-20 days for 2-3 consecutive times. The third is wrinkle leaf disease. Symptoms manifested as early damage buds 5-6 days open, curled into groups, branches can not be elongated, all the leaves shrinkage, swelling thickening, and red or purple, like chicken-like. With the growth of the victim buds, a ball with a diameter of 5-20 cm is formed. It is dry at the end and easily falls off with the wind. Wrinkle disease is caused by fleas. If drugs with systemic or ovicidal effects are used, they can be sprayed every 15 days.
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