(1) Planting water
Afforestation should be divided into two or three times, with pit bottom 1 time and pit inside 1 time. After the hole surface is filled, water is poured again, and then the soil is sealed to keep moisture. Or irrigation after the first grouting 1 time and irrigation after planting 1 time. After the soil is settled, cover it with dry soil to protect the seedlings and keep moisture. In short, it should be fully watered and transparent.
(2) Germination water
Spring drought is the most serious in arid and semi-arid areas, and the soil moisture in spring can no longer meet the needs of poplar growth. Watering once during bud germination will promote germination and leaf spreading, and lay a good foundation for the arrival of poplar fast-growing period.
(3) Growth water
When poplars enter the growth period, especially in May-July, trees grow faster, accumulate more dry matter, increase the intensity of photosynthesis, and have a higher transpiration rate, which correspondingly consumes a lot of water. If water supply cannot be maintained, water stress will inevitably affect the coordination of various metabolic activities. So this period needs a lot of irrigation. Generally, light soil has poor water retention performance, so it should be poured more, while cohesive soil must be poured thoroughly.
(4) Frozen water
After the trees have fallen leaves, before the soil is frozen, pour 1 time of freezing water, and pour enough water so that the poplar can absorb enough water and the soil can store enough water for the winter. This is necessary to alleviate the drought that often occurs in winter and spring.