In the spring of the next year, we have inserted more than 3 meters of poplar, and the underground root system is complete. At this time, we need to apply fertilizer in time.
In May and June, it is a period of rapid growth of poplars. This period requires a lot of nutrients. Therefore, the first fertilization is to use 225 to 375 g of compound fertilizer per tree in the middle of May; the second time is in mid and late June. 300 to 450 g of compound fertilizer per tree; after July and August, the growth of the branches slowly weakened, but the roots showed vigorous growth. Then, the phosphorus and potassium fertilizers should be added in a timely manner. Each tree should be applied with 350 kg of compound fertilizer. 400 grams.
From the second year onwards, weeding is often required. Weeding should follow the principle of “in addition to early, small, and exceptâ€, and loose soil should be timely and comprehensive. Do not hurt the seedlings, do not hurt the roots.
Spring is a season of high incidence of poplar diseases, which poses a serious threat to the growth of poplar trees in the spring. Common poplar diseases include ulcer disease, black spot disease and rot disease, etc. Prevention can be prevented by whitening the trunk or spraying fungicides. . The commonly used fungicides are lime sulfur, Bordeaux fluid, carbendazim and so on. According to the instruction of the amount of water, evenly sprayed on the trunk and branches, can effectively prevent ulcer disease and black spot. The trunk is painted white, which is also one of the measures for pest control. The commonly used whitening agent formula is: water 70%, quick lime 29%, lime sulfur 0.5%, salt 0.5%.
In the spring of the third year, poplar cuttings have been erected and erected, with straight trunks and lush foliage. Management after the third year is basically the same as the second year.
In the fourth year, after the poplar's DBH exceeds 20 cm, it reached the standard for logging. At this time, it can either be cut down for sale or it can be allowed to grow for another year. By the fifth year, when Yang Shuchang grows taller and thicker, it will be sold for sale. .
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