How to manage Populus euphratica in the middle and late period?

After planting, Populus tomentosa entered the fast-growing period in June, and the peak growth period was in July. At the fastest time, the day and night can be as long as 1.5cm, and it starts to reach the peak around 1.00 (depending on the specific climate conditions in each place). At the same time, it is necessary to strengthen fertilizer and water management and increase output value.

(1) Colonization

Planting 49,500 cuttings per hectare can produce about 45,000 seedlings with a plant height of 20-30 cm. Weak seedlings and mutant seedlings were removed, leaving one strong seedling per plant.

(2) Topdressing and watering

① Seedling stage. Seedling height 10 ~ 15 cm. Water in time in case of drought, the root system at seedling stage is weak and shallow, and the drought tolerance is poor. Timely watering is the key to cultivate strong seedlings. ② Seedling stage. When the plant height is about 80 cm, intertillage weeding, topdressing and watering should be carried out. In order to improve fertilizer efficiency, it is necessary to weed first, then water, and finally topdressing. Apply urea 105 ~ 150 kg per hectare, which can be applied in holes or ditches, and the fertilization depth is 3 ~ 5 cm. ③ Large seedling stage. The plant height is about 150 cm, and the second topdressing is 225 kg of ternary compound fertilizer of nitrogen, phosphorus and potassium per hectare, which is applied in holes or furrows and after the rain falls. In dry and rainy weather, topdressing before watering. ④ Rapid growth period. The rainy season in July is hot, and the height of Populus tomentosa is 150 ~ 200 cm, during which it grows rapidly. When it rains, urinate in time, 225 ~ 300 kg per hectare. ⑤ Late growth stage. The fourth topdressing was carried out around August 10 in Huanghuai basin. This kind of topdressing needs hole application, and too many roots are damaged by furrowing fertilization, which affects growth and has poor sowing effect. In order to promote the growth of seedlings and enhance their stress resistance, 225 kg of NPK compound fertilizer was applied per hectare, and whether to water them was decided according to the soil moisture. Top dressing should be done 4 times during the whole growth period, with an interval of about 20 days. The types and quantities of topdressing should be appropriately adjusted and increased according to soil fertility. Before seedling stage, after rain or watering, intertillage, weeding and loosening soil.

(3) Pruning

Yang Miao, with sparse red leaves, high fertility and vigorous growth, is prone to produce lateral branches when the plant height is 100 ~ 250 cm, which will affect the growth of trunk. This lateral branch can be 30 cm long in 2 days, lignified in 4 days, and buds should be removed in time.