Poplar planting conditions
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Second, the temperature conditions of poplars on the temperature plasticity is very large. The average annual temperature of the regions with the highest productivity in Europe and the United States is not less than 9.5 degrees. The average temperature during the growth period is 16.5 degrees. The temperature required for strong poplar trees in the Americas is greater than that of Europe and the United States.
The average temperature of the south limit of the poplar's natural distribution is 8 degrees in January, and the average temperature in Taiwan in January is about 10 degrees, within this range. In July, an average temperature of 20 degrees (a high temperature that can withstand a short period of 40 degrees Celsius) is about 20 degrees in Taiwan, and is also within this range. There is basically no distribution of poplars in areas where the average temperature in January is above 12 degrees.
Third, the water conditions Poplar is very much in need of water, poplar plantation in the active period of the leaf dry weight for each additional 1 grams, need to absorb 6-7 cubic centimeters per day. For every 24 hours during May-September, the amount of water absorbed per gram of leaves (dry weight) was 50.1 cubic centimeters.
Poplar trees prefer water, but they are not resistant to water. Site conditions where the flowing water stays for more than 100 days during growth are not suitable for planting poplar; viscous heavy soils with a groundwater level of not less than 50cm or a groundwater level of less than 2 meters should not be planted.
Poplar is very demanding on the water, generally should be watered 3 to 4 times a year. In early March, germinate and return to Qingshui before germination; from May to June, irrigation promotes raw water and promotes the expansion of branches and leaves; in November, irrigation and freezing water are encouraged to promote root growth. After the fertilization, it should be irrigated with drought. Fertilize sub-basal fertilizer and top dressing. The basal fertilizer is applied in a hole in the planting of trees. Generally, 5 to 10 kg of organic fertilizer or 250 g of superphosphate is used to mix the fertilized material and the mature soil and backfilled in a root activity layer of 30 to 60 cm. Fertilizers were applied to fertilize the ditch at the edge of the canopy. The length of the ditch was 80cm, width 20cm, depth 20 to 30cm, and urea 250g. For better mixing of nitrogen and phosphorus, the ratio is n:5 phosphorus oxide = 3:1. Watering, cultivating and weeding should be conducted promptly after fertilization.
Fourth, the PH value and salt content of American black poplar and European and American poplar suitable for the growth of PH value of 6.5-7.5. Most poplars cannot adapt to PH5-5.5 or above.
The patience of poplars is more complex. It is related to the salt and salt content of the soil, and the salt content of the soil is closely related to the local precipitation, climate, temperature, and evaporation.
The maximum salt content of Populus deltoides is O.15% (0-20 cm in soil, and the salt is mainly carbonate and sulfate).
V. Soil conditions The effective soil layer can be planted in 40-100 cm. The thicker the better, the best groundwater level is between 1.5-2 meters. If there is no drainage measures under 0.5 meters for a long time, it is not suitable to plant poplar trees. If the groundwater level is slightly higher than two meters, the soil structure is better and poplar trees can still be cultivated.
VI. Fertigation and weeding conditions of poplars The weeding and weeding can improve the physicochemical properties of the soil. In the early stage, it can be combined with thinning to plow the fork. After weeding, it should also be cultivated and weeded once a year, which is very effective in promoting the growth of trees.
