加拿大杨属高大乔木,为速生树种。耐水湿,适于河滩地或草甸土上生长。主要栽植在华北、西北、东北地区,向南至长江中、下游,我省各地皆有栽植。为了适应绿化的需要,培育速生、优质、丰产的加拿大杨苗木,我们于一九七九年在所内进行了加拿大杨苗期施肥试验。探讨加拿大杨苗期对主要营养元素氮、磷、钾的需要,以及氮、磷、钾对苗木的生长和干物质积累的影响,试图为苗圃的科学施肥提供依据。现将试验结果总结如下: Poplar is a tall tree in Canada, is a fast-growing tree species. Water wet, suitable for floodplain or meadow soil growth. Mainly planted in North China, Northwest China, Northeast China, south to the Yangtze River, the lower reaches of the province Jieyou are planted. In order to meet the needs of afforestation, to cultivate fast-growing, high-quality and high-yield poplar seedlings in Canada, we conducted Canadian poplar seedling fertilization experiments in 1979. To investigate the effects of nitrogen, phosphorus and potassium on the main nutrient elements of poplar in Canada and the effects of nitrogen, phosphorus and potassium on the growth and dry matter accumulation of seedlings, and to provide the basis for scientific fertilization in nursery. Now the test results are summarized as follows: