What kind of fertilizer should be used for poplar?

It is good for poplars to use nitrogen-heavy compound fertilizer. Usually 15-20 kg of urea and 25-30 kg of compound fertilizer can be applied per mu from June to July, with a fertilization depth of 5-10 cm. After fertilization, the soil is buried and watered thoroughly, or the fertilizer can be diluted and sprayed on the seedling bed, and then rinse the seedlings with clean water. you can top fertilize the lateral roots of the seedlings, and don't apply fertilizer after the Beginning of Autumn to prevent the seedlings from growing too much.

Fertilization method:

The application of base fertilizer in the planting hole during afforestation has a good effect, which can supply fertilizer and improve the physical and chemical properties of soil for a long time. Base fertilizer is generally farm manure and slow-acting chemical fertilizer, which can be pressed green with soil miscellaneous fertilizer, cake fertilizer and green manure. Soil and miscellaneous fertilizer can be applied 10-20 kg per plant, cottonseed cake or rapeseed cake 2-5 kg per plant, crushed and green manure 10 kg per plant. In the year of afforestation, there is no need to topdressing, because the root system of seedlings is still in the recovery stage, and the ability to absorb nutrients is weak.

Each young tree, nitrogen 150 grams, phosphorus pentoxide 150 grams, potassium oxide 25 grams, Amorpha green manure 10 kilograms. At this level of fertilization, the DBH growth of young poplar forest Imuri 214 can reach about 5cm, and the height growth is 2-3m. In the west of Shandong Province, planting Amorpha fruticosa and Shadawang as green manure under the forest has good economic and ecological benefits.

The fertilization of poplar should be based on nitrogen fertilizer, and the soil with low content of organic matter can obviously promote the growth of poplar by using farm manure as base fertilizer and topdressing nitrogen and phosphorus fertilizer. The effect of combined application of nitrogen, phosphorus or nitrogen, phosphorus and potassium was better than that of single application. Therefore, it is best to apply two or three kinds of fertilizers together, mainly nitrogen fertilizer. The amount of nitrogen and the ratio of nitrogen, phosphorus and potassium are determined according to the soil conditions. the amount of nitrogen is 250kg 500g per plant, nitrogen ∶, phosphorus pentoxide, ∶ and potassium oxide = 3 (2) ∶ 1 ∶ 0.5. At present, most poplar fertilizers only apply nitrogen fertilizer, and the tendency to ignore phosphate fertilizer should be corrected. The author puts forward the following fertilization schemes for cultivating large diameter wood and small diameter wood for reference. The urea used contains 46% nitrogen and calcium superphosphate contains P2O5 14%.

The application of nitrogen fertilizer, phosphate fertilizer and green manure can obviously promote the growth of poplar. The volume growth of the fertilizer application area can be increased by 274.2% compared with the control area, the DBH is 74.5% higher than that of the control, and the tree height is 69% higher than that of the control. The effect of green manure is the most obvious, followed by phosphate fertilizer and nitrogen fertilizer, and the effect of potassium fertilizer is not significant. Chemical fertilizer should be combined with green manure.