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通过对6年生杨树造纸试验林施肥试验结果的分析，发现杨树造纸林压绿肥没能明显地促进林木的生长，也没有明显地起到改良土壤的作用；施化肥（尿素）能够促进林木的生长，并能提高林分的产量，但经济效益呈负增长，建议各地杨树生产单位不要盲目施肥。
Based on the analysis of fertilization experiment results of 6-year-old poplar papermaking plantation, it was found that poplar manure green manure did not obviously promote the growth of forest trees and did not obviously play a role in improving soil. Fertilizer (urea) Growth, and can improve the yield of stand, but the economic benefits showed a negative growth, it is recommended that poplar units around do not blindly fertilize.